QPainter Class Reference

The QPainter class performs low-level painting on widgets and other paint devices.

  1. #include <QPainter>

Inherited by: Q3Painter and QStylePainter.

Note: All functions in this class are reentrant.

Detailed Description

The QPainter class performs low-level painting on widgets and other paint devices.

QPainter provides highly optimized functions to do most of the drawing GUI programs require. It can draw everything from simple lines to complex shapes like pies and chords. It can also draw aligned text and pixmaps. Normally, it draws in a "natural" coordinate system, but it can also do view and world transformation. QPainter can operate on any object that inherits the QPaintDevice class.

The common use of QPainter is inside a widget's paint event: Construct and customize (e.g. set the pen or the brush) the painter. Then draw. Remember to destroy the QPainter object after drawing. For example:

  1. void SimpleExampleWidget::paintEvent(QPaintEvent *)
  2.  {
  3.     QPainter painter(this);
  4.     painter.setPen(Qt::blue);
  5.     painter.setFont(QFont("Arial", 30));
  6.     painter.drawText(rect(), Qt::AlignCenter, "Qt");
  7. }

The core functionality of QPainter is drawing, but the class also provide several functions that allows you to customize QPainter's settings and its rendering quality, and others that enable clipping. In addition you can control how different shapes are merged together by specifying the painter's composition mode.

The isActive() function indicates whether the painter is active. A painter is activated by the begin() function and the constructor that takes a QPaintDevice argument. The end() function, and the destructor, deactivates it.

Together with the QPaintDevice and QPaintEngine classes, QPainter form the basis for Qt's paint system. QPainter is the class used to perform drawing operations. QPaintDevice represents a device that can be painted on using a QPainter. QPaintEngine provides the interface that the painter uses to draw onto different types of devices. If the painter is active, device() returns the paint device on which the painter paints, and paintEngine() returns the paint engine that the painter is currently operating on. For more information, see the Paint System.

Sometimes it is desirable to make someone else paint on an unusual QPaintDevice. QPainter supports a static function to do this, setRedirected().

Warning: When the paintdevice is a widget, QPainter can only be used inside a paintEvent() function or in a function called by paintEvent(); that is unless the Qt::WA_PaintOutsidePaintEvent widget attribute is set. On Mac OS X and Windows, you can only paint in a paintEvent() function regardless of this attribute's setting.

Settings

There are several settings that you can customize to make QPainter draw according to your preferences:

Note that some of these settings mirror settings in some paint devices, e.g. QWidget::font(). The QPainter::begin() function (or equivalently the QPainter constructor) copies these attributes from the paint device.

You can at any time save the QPainter's state by calling the save() function which saves all the available settings on an internal stack. The restore() function pops them back.

Drawing

QPainter provides functions to draw most primitives: drawPoint(), drawPoints(), drawLine(), drawRect(), drawRoundedRect(), drawEllipse(), drawArc(), drawPie(), drawChord(), drawPolyline(), drawPolygon(), drawConvexPolygon() and drawCubicBezier(). The two convenience functions, drawRects() and drawLines(), draw the given number of rectangles or lines in the given array of QRects or QLines using the current pen and brush.

The QPainter class also provides the fillRect() function which fills the given QRect, with the given QBrush, and the eraseRect() function that erases the area inside the given rectangle.

All of these functions have both integer and floating point versions.

Basic Drawing Example

The Basic Drawing example shows how to display basic graphics primitives in a variety of styles using the QPainter class.

If you need to draw a complex shape, especially if you need to do so repeatedly, consider creating a QPainterPath and drawing it using drawPath().

Painter Paths example

The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.

The Painter Paths example shows how painter paths can be used to build complex shapes for rendering.

QPainter also provides the fillPath() function which fills the given QPainterPath with the given QBrush, and the strokePath() function that draws the outline of the given path (i.e. strokes the path).

See also the Vector Deformation demo which shows how to use advanced vector techniques to draw text using a QPainterPath, the Gradients demo which shows the different types of gradients that are available in Qt, and the Path Stroking demo which shows Qt's built-in dash patterns and shows how custom patterns can be used to extend the range of available patterns.

Vector Deformation Gradients Path Stroking

There are functions to draw pixmaps/images, namely drawPixmap(), drawImage() and drawTiledPixmap(). Both drawPixmap() and drawImage() produce the same result, except that drawPixmap() is faster on-screen while drawImage() may be faster on a QPrinter or other devices.

Text drawing is done using drawText(). When you need fine-grained positioning, boundingRect() tells you where a given drawText() command will draw.

There is a drawPicture() function that draws the contents of an entire QPicture. The drawPicture() function is the only function that disregards all the painter's settings as QPicture has its own settings.

Rendering Quality

To get the optimal rendering result using QPainter, you should use the platform independent QImage as paint device; i.e. using QImage will ensure that the result has an identical pixel representation on any platform.

The QPainter class also provides a means of controlling the rendering quality through its RenderHint enum and the support for floating point precision: All the functions for drawing primitives has a floating point version. These are often used in combination with the QPainter::Antialiasing render hint.

Concentric Circles Example

The Concentric Circles example shows the improved rendering quality that can be obtained using floating point precision and anti-aliasing when drawing custom widgets.

The application's main window displays several widgets which are drawn using the various combinations of precision and anti-aliasing.

The RenderHint enum specifies flags to QPainter that may or may not be respected by any given engine. QPainter::Antialiasing indicates that the engine should antialias edges of primitives if possible, QPainter::TextAntialiasing indicates that the engine should antialias text if possible, and the QPainter::SmoothPixmapTransform indicates that the engine should use a smooth pixmap transformation algorithm. HighQualityAntialiasing is an OpenGL-specific rendering hint indicating that the engine should use fragment programs and offscreen rendering for antialiasing.

The renderHints() function returns a flag that specifies the rendering hints that are set for this painter. Use the setRenderHint() function to set or clear the currently set RenderHints.

Coordinate Transformations

Normally, the QPainter operates on the device's own coordinate system (usually pixels), but QPainter has good support for coordinate transformations.

nop rotate() scale() translate()

The most commonly used transformations are scaling, rotation, translation and shearing. Use the scale() function to scale the coordinate system by a given offset, the rotate() function to rotate it clockwise and translate() to translate it (i.e. adding a given offset to the points). You can also twist the coordinate system around the origin using the shear() function. See the Affine Transformations demo for a visualization of a sheared coordinate system.

See also the Transformations example which shows how transformations influence the way that QPainter renders graphics primitives. In particular it shows how the order of transformations affects the result.

Affine Transformations Demo

The Affine Transformations demo show Qt's ability to perform affine transformations on painting operations. The demo also allows the user to experiment with the transformation operations and see the results immediately.

All the tranformation operations operate on the transformation worldTransform(). A matrix transforms a point in the plane to another point. For more information about the transformation matrix, see the Coordinate System and QTransform documentation.

The setWorldTransform() function can replace or add to the currently set worldTransform(). The resetTransform() function resets any transformations that were made using translate(), scale(), shear(), rotate(), setWorldTransform(), setViewport() and setWindow() functions. The deviceTransform() returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device. The latter function is only needed when using platform painting commands on the platform dependent handle, and the platform does not do transformations nativly.

When drawing with QPainter, we specify points using logical coordinates which then are converted into the physical coordinates of the paint device. The mapping of the logical coordinates to the physical coordinates are handled by QPainter's combinedTransform(), a combination of viewport() and window() and worldTransform(). The viewport() represents the physical coordinates specifying an arbitrary rectangle, the window() describes the same rectangle in logical coordinates, and the worldTransform() is identical with the transformation matrix.

See also Coordinate System

Clipping

QPainter can clip any drawing operation to a rectangle, a region, or a vector path. The current clip is available using the functions clipRegion() and clipPath(). Whether paths or regions are preferred (faster) depends on the underlying paintEngine(). For example, the QImage paint engine prefers paths while the X11 paint engine prefers regions. Setting a clip is done in the painters logical coordinates.

After QPainter's clipping, the paint device may also clip. For example, most widgets clip away the pixels used by child widgets, and most printers clip away an area near the edges of the paper. This additional clipping is not reflected by the return value of clipRegion() or hasClipping().

Composition Modes

QPainter provides the CompositionMode enum which defines the Porter-Duff rules for digital image compositing; it describes a model for combining the pixels in one image, the source, with the pixels in another image, the destination.

The two most common forms of composition are Source and SourceOver. Source is used to draw opaque objects onto a paint device. In this mode, each pixel in the source replaces the corresponding pixel in the destination. In SourceOver composition mode, the source object is transparent and is drawn on top of the destination.

Note that composition transformation operates pixelwise. For that reason, there is a difference between using the graphic primitive itself and its bounding rectangle: The bounding rect contains pixels with alpha == 0 (i.e the pixels surrounding the primitive). These pixels will overwrite the other image's pixels, affectively clearing those, while the primitive only overwrites its own area.

Composition Modes Demo

The Composition Modes demo, available in Qt's demo directory, allows you to experiment with the various composition modes and see the results immediately.

Limitations

If you are using coordinates with Qt's raster-based paint engine, it is important to note that, while coordinates greater than +/- 215 can be used, any painting performed with coordinates outside this range is not guaranteed to be shown; the drawing may be clipped. This is due to the use of short int in the implementation.

The outlines generated by Qt's stroker are only an approximation when dealing with curved shapes. It is in most cases impossible to represent the outline of a bezier curve segment using another bezier curve segment, and so Qt approximates the curve outlines by using several smaller curves. For performance reasons there is a limit to how many curves Qt uses for these outlines, and thus when using large pen widths or scales the outline error increases. To generate outlines with smaller errors it is possible to use the QPainterPathStroker class, which has the setCurveThreshold member function which let's the user specify the error tolerance. Another workaround is to convert the paths to polygons first and then draw the polygons instead.

Performance

QPainter is a rich framework that allows developers to do a great variety of graphical operations, such as gradients, composition modes and vector graphics. And QPainter can do this across a variety of different hardware and software stacks. Naturally the underlying combination of hardware and software has some implications for performance, and ensuring that every single operation is fast in combination with all the various combinations of composition modes, brushes, clipping, transformation, etc, is close to an impossible task because of the number of permutations. As a compromise we have selected a subset of the QPainter API and backends, where performance is guaranteed to be as good as we can sensibly get it for the given combination of hardware and software.

The backends we focus on as high-performance engines are:

  • Raster - This backend implements all rendering in pure software and is always used to render into QImages. For optimal performance only use the format types QImage::Format_ARGB32_Premultiplied, QImage::Format_RGB32 or QImage::Format_RGB16. Any other format, including QImage::Format_ARGB32, has significantly worse performance. This engine is also used by default on Windows and on QWS. It can be used as default graphics system on any OS/hardware/software combination by passing -graphicssystem raster on the command line
  • OpenGL 2.0 (ES) - This backend is the primary backend for hardware accelerated graphics. It can be run on desktop machines and embedded devices supporting the OpenGL 2.0 or OpenGL/ES 2.0 specification. This includes most graphics chips produced in the last couple of years. The engine can be enabled by using QPainter onto a QGLWidget or by passing -graphicssystem opengl on the command line when the underlying system supports it.
  • OpenVG - This backend implements the Khronos standard for 2D and Vector Graphics. It is primarily for embedded devices with hardware support for OpenVG. The engine can be enabled by passing -graphicssystem openvg on the command line when the underlying system supports it.

These operations are:

  • Simple transformations, meaning translation and scaling, pluss 0, 90, 180, 270 degree rotations.
  • drawPixmap() in combination with simple transformations and opacity with non-smooth transformation mode (QPainter::SmoothPixmapTransform not enabled as a render hint).
  • Rectangle fills with solid color, two-color linear gradients and simple transforms.
  • Rectangular clipping with simple transformations and intersect clip.
  • Composition Modes QPainter::CompositionMode_Source and QPainter::CompositionMode_SourceOver
  • Rounded rectangle filling using solid color and two-color linear gradients fills.
  • 3x3 patched pixmaps, via qDrawBorderPixmap.

This list gives an indication of which features to safely use in an application where performance is critical. For certain setups, other operations may be fast too, but before making extensive use of them, it is recommended to benchmark and verify them on the system where the software will run in the end. There are also cases where expensive operations are ok to use, for instance when the result is cached in a QPixmap.

See also QPaintDevice, QPaintEngine, QtSvg Module, Basic Drawing Example, and Drawing Utility Functions.

Public Types

Toggle detailsenum QPainter::

CompositionModeCompositionMode { CompositionMode_SourceOver , CompositionMode_DestinationOver , CompositionMode_Clear , CompositionMode_Source , CompositionMode_Destination , CompositionMode_SourceIn , CompositionMode_DestinationIn , CompositionMode_SourceOut , CompositionMode_DestinationOut , CompositionMode_SourceAtop , CompositionMode_DestinationAtop , CompositionMode_Xor , CompositionMode_Plus , CompositionMode_Multiply , CompositionMode_Screen , CompositionMode_Overlay , CompositionMode_Darken , CompositionMode_Lighten , CompositionMode_ColorDodge , CompositionMode_ColorBurn , CompositionMode_HardLight , CompositionMode_SoftLight , CompositionMode_Difference , CompositionMode_Exclusion , RasterOp_SourceOrDestination , RasterOp_SourceAndDestination , RasterOp_SourceXorDestination , RasterOp_NotSourceAndNotDestination , RasterOp_NotSourceOrNotDestination , RasterOp_NotSourceXorDestination , RasterOp_NotSource , RasterOp_NotSourceAndDestination , RasterOp_SourceAndNotDestination 32 ...} { CompositionMode_SourceOver , CompositionMode_DestinationOver , CompositionMode_Clear , CompositionMode_Source , CompositionMode_Destination , CompositionMode_SourceIn , CompositionMode_DestinationIn , CompositionMode_SourceOut , CompositionMode_DestinationOut , CompositionMode_SourceAtop , CompositionMode_DestinationAtop , CompositionMode_Xor , CompositionMode_Plus , CompositionMode_Multiply , CompositionMode_Screen , CompositionMode_Overlay , CompositionMode_Darken , CompositionMode_Lighten , CompositionMode_ColorDodge , CompositionMode_ColorBurn , CompositionMode_HardLight , CompositionMode_SoftLight , CompositionMode_Difference , CompositionMode_Exclusion , RasterOp_SourceOrDestination , RasterOp_SourceAndDestination , RasterOp_SourceXorDestination , RasterOp_NotSourceAndNotDestination , RasterOp_NotSourceOrNotDestination , RasterOp_NotSourceXorDestination , RasterOp_NotSource , RasterOp_NotSourceAndDestination , RasterOp_SourceAndNotDestination 32 }

Defines the modes supported for digital image compositing. Composition modes are used to specify how the pixels in one image, the source, are merged with the pixel in another image, the destination.

Please note that the bitwise raster operation modes, denoted with a RasterOp prefix, are only natively supported in the X11 and raster paint engines. This means that the only way to utilize these modes on the Mac is via a QImage. The RasterOp denoted blend modes are not supported for pens and brushes with alpha components. Also, turning on the QPainter::Antialiasing render hint will effectively disable the RasterOp modes.

The most common type is SourceOver (often referred to as just alpha blending) where the source pixel is blended on top of the destination pixel in such a way that the alpha component of the source defines the translucency of the pixel.

When the paint device is a QImage, the image format must be set to Format_ARGB32Premultiplied or Format_ARGB32 for the composition modes to have any effect. For performance the premultiplied version is the preferred format.

When a composition mode is set it applies to all painting operator, pens, brushes, gradients and pixmap/image drawing.

ConstantValueDescription
QPainter::CompositionMode_SourceOver 0 This is the default mode. The alpha of the source is used to blend the pixel on top of the destination.
QPainter::CompositionMode_DestinationOver 1 The alpha of the destination is used to blend it on top of the source pixels. This mode is the inverse of CompositionMode_SourceOver.
QPainter::CompositionMode_Clear 2 The pixels in the destination are cleared (set to fully transparent) independent of the source.
QPainter::CompositionMode_Source 3 The output is the source pixel. (This means a basic copy operation and is identical to SourceOver when the source pixel is opaque).
QPainter::CompositionMode_Destination 4 The output is the destination pixel. This means that the blending has no effect. This mode is the inverse of CompositionMode_Source.
QPainter::CompositionMode_SourceIn 5 The output is the source, where the alpha is reduced by that of the destination.
QPainter::CompositionMode_DestinationIn 6 The output is the destination, where the alpha is reduced by that of the source. This mode is the inverse of CompositionMode_SourceIn.
QPainter::CompositionMode_SourceOut 7 The output is the source, where the alpha is reduced by the inverse of destination.
QPainter::CompositionMode_DestinationOut 8 The output is the destination, where the alpha is reduced by the inverse of the source. This mode is the inverse of CompositionMode_SourceOut.
QPainter::CompositionMode_SourceAtop 9 The source pixel is blended on top of the destination, with the alpha of the source pixel reduced by the alpha of the destination pixel.
QPainter::CompositionMode_DestinationAtop 10 The destination pixel is blended on top of the source, with the alpha of the destination pixel is reduced by the alpha of the destination pixel. This mode is the inverse of CompositionMode_SourceAtop.
QPainter::CompositionMode_Xor 11 The source, whose alpha is reduced with the inverse of the destination alpha, is merged with the destination, whose alpha is reduced by the inverse of the source alpha. CompositionMode_Xor is not the same as the bitwise Xor.
QPainter::CompositionMode_Plus 12 Both the alpha and color of the source and destination pixels are added together.
QPainter::CompositionMode_Multiply 13 The output is the source color multiplied by the destination. Multiplying a color with white leaves the color unchanged, while multiplying a color with black produces black.
QPainter::CompositionMode_Screen 14 The source and destination colors are inverted and then multiplied. Screening a color with white produces white, whereas screening a color with black leaves the color unchanged.
QPainter::CompositionMode_Overlay 15 Multiplies or screens the colors depending on the destination color. The destination color is mixed with the source color to reflect the lightness or darkness of the destination.
QPainter::CompositionMode_Darken 16 The darker of the source and destination colors is selected.
QPainter::CompositionMode_Lighten 17 The lighter of the source and destination colors is selected.
QPainter::CompositionMode_ColorDodge 18 The destination color is brightened to reflect the source color. A black source color leaves the destination color unchanged.
QPainter::CompositionMode_ColorBurn 19 The destination color is darkened to reflect the source color. A white source color leaves the destination color unchanged.
QPainter::CompositionMode_HardLight 20 Multiplies or screens the colors depending on the source color. A light source color will lighten the destination color, whereas a dark source color will darken the destination color.
QPainter::CompositionMode_SoftLight 21 Darkens or lightens the colors depending on the source color. Similar to CompositionMode_HardLight.
QPainter::CompositionMode_Difference 22 Subtracts the darker of the colors from the lighter. Painting with white inverts the destination color, whereas painting with black leaves the destination color unchanged.
QPainter::CompositionMode_Exclusion 23 Similar to CompositionMode_Difference, but with a lower contrast. Painting with white inverts the destination color, whereas painting with black leaves the destination color unchanged.
QPainter::RasterOp_SourceOrDestination 24 Does a bitwise OR operation on the source and destination pixels (src OR dst).
QPainter::RasterOp_SourceAndDestination 25 Does a bitwise AND operation on the source and destination pixels (src AND dst).
QPainter::RasterOp_SourceXorDestination 26 Does a bitwise XOR operation on the source and destination pixels (src XOR dst).
QPainter::RasterOp_NotSourceAndNotDestination 27 Does a bitwise NOR operation on the source and destination pixels ((NOT src) AND (NOT dst)).
QPainter::RasterOp_NotSourceOrNotDestination 28 Does a bitwise NAND operation on the source and destination pixels ((NOT src) OR (NOT dst)).
QPainter::RasterOp_NotSourceXorDestination 29 Does a bitwise operation where the source pixels are inverted and then XOR'ed with the destination ((NOT src) XOR dst).
QPainter::RasterOp_NotSource 30 Does a bitwise operation where the source pixels are inverted (NOT src).
QPainter::RasterOp_NotSourceAndDestination 31 Does a bitwise operation where the source is inverted and then AND'ed with the destination ((NOT src) AND dst).
QPainter::RasterOp_SourceAndNotDestination 32 Does a bitwise operation where the source is AND'ed with the inverted destination pixels (src AND (NOT dst)).

See also compositionMode(), setCompositionMode(), Composition Modes, and Image Composition Example.

Look up this member in the source code.

Toggle detailsenum QPainter::

PixmapFragmentHintPixmapFragmentHint { OpaqueHint 0x01 ...} { OpaqueHint 0x01 }

ConstantValueDescription
QPainter::OpaqueHint 0x01 Indicates that the pixmap fragments to be drawn are opaque. Opaque fragments are potentially faster to draw.

See also QPainter::drawPixmapFragments() and QPainter::PixmapFragment.

Look up this member in the source code.

Toggle detailsenum QPainter::

RenderHintRenderHint { Antialiasing , TextAntialiasing , SmoothPixmapTransform , HighQualityAntialiasing , NonCosmeticDefaultPen 0x10 ...} { Antialiasing , TextAntialiasing , SmoothPixmapTransform , HighQualityAntialiasing , NonCosmeticDefaultPen 0x10 }

Renderhints are used to specify flags to QPainter that may or may not be respected by any given engine.

ConstantValueDescription
QPainter::Antialiasing 0x01 Indicates that the engine should antialias edges of primitives if possible.
QPainter::TextAntialiasing 0x02 Indicates that the engine should antialias text if possible. To forcibly disable antialiasing for text, do not use this hint. Instead, set QFont::NoAntialias on your font's style strategy.
QPainter::SmoothPixmapTransform 0x04 Indicates that the engine should use a smooth pixmap transformation algorithm (such as bilinear) rather than nearest neighbor.
QPainter::HighQualityAntialiasing 0x08 An OpenGL-specific rendering hint indicating that the engine should use fragment programs and offscreen rendering for antialiasing.
QPainter::NonCosmeticDefaultPen 0x10 The engine should interpret pens with a width of 0 (which otherwise enables QPen::isCosmetic()) as being a non-cosmetic pen with a width of 1.

See also renderHints(), setRenderHint(), Rendering Quality, and Concentric Circles Example.

Look up this member in the source code.

    Public Functions

    Toggle details QPainter

    QPainterQPainter () ()

    Constructs a painter.

    See also begin() and end().

    Look up this member in the source code.

    Toggle details QPainter

    QPainterQPainter ( QPaintDevice *device ) ( QPaintDevice *device )

    Constructs a painter that begins painting the paint device immediately.

    This constructor is convenient for short-lived painters, e.g. in a QWidget::paintEvent() and should be used only once. The constructor calls begin() for you and the QPainter destructor automatically calls end().

    Here's an example using begin() and end():

    1. void MyWidget::paintEvent(QPaintEvent *)
    2.  {
    3.     QPainter p;
    4.     p.begin(this);
    5.     p.drawLine(...);        // drawing code
    6.     p.end();
    7. }

    The same example using this constructor:

    1. void MyWidget::paintEvent(QPaintEvent *)
    2.  {
    3.     QPainter p(this);
    4.     p.drawLine(...);        // drawing code
    5. }

    Since the constructor cannot provide feedback when the initialization of the painter failed you should rather use begin() and end() to paint on external devices, e.g. printers.

    See also begin() and end().

    Look up this member in the source code.

    Toggle details QPainter

    ~QPainter~QPainter () ()

    Destroys the painter.

    Look up this member in the source code.

    Toggle details const QBrush & QPainter

    backgroundbackground () ()const

    Returns the current background brush.

    See also setBackground() and Settings.

    Look up this member in the source code.

    Toggle details Qt::BGMode QPainter

    backgroundModebackgroundMode () ()const

    Returns the current background mode.

    See also setBackgroundMode() and Settings.

    Look up this member in the source code.

    Toggle details bool QPainter

    beginbegin ( QPaintDevice *device ) ( QPaintDevice *device )

    Begins painting the paint device and returns true if successful; otherwise returns false.

    Notice that all painter settings (setPen(), setBrush() etc.) are reset to default values when begin() is called.

    The errors that can occur are serious problems, such as these:

    1. painter->begin(0); // impossible - paint device cannot be 0
    2.  
    3. QPixmap image(0, 0);
    4. painter->begin(&image); // impossible - image.isNull() == true;
    5.  
    6. painter->begin(myWidget);
    7. painter2->begin(myWidget); // impossible - only one painter at a time

    Note that most of the time, you can use one of the constructors instead of begin(), and that end() is automatically done at destruction.

    Warning: A paint device can only be painted by one painter at a time.

    Warning: Painting on a QImage with the format QImage::Format_Indexed8 is not supported.

    See also end() and QPainter().

    Look up this member in the source code.

    Toggle details void QPainter

    beginNativePaintingbeginNativePainting () ()

    Flushes the painting pipeline and prepares for the user issuing commands directly to the underlying graphics context. Must be followed by a call to endNativePainting().

    Note that only the states the underlying paint engine changes will be reset to their respective default states. The states we reset may change from release to release. The following states are currently reset in the OpenGL 2 engine:

    • blending is disabled
    • the depth, stencil and scissor tests are disabled
    • the active texture unit is reset to 0
    • the depth mask, depth function and the clear depth are reset to their default values
    • the stencil mask, stencil operation and stencil function are reset to their default values
    • the current color is reset to solid white

    If, for example, the OpenGL polygon mode is changed by the user inside a beginNativePaint()/endNativePainting() block, it will not be reset to the default state by endNativePainting(). Here is an example that shows intermixing of painter commands and raw OpenGL commands:

    1.                     QPainter painter(this);
    2. painter.fillRect(0, 0, 128, 128, Qt::green);
    3. painter.beginNativePainting();
    4.  
    5. glEnable(GL_SCISSOR_TEST);
    6. glScissor(0, 0, 64, 64);
    7.  
    8. glClearColor(1, 0, 0, 1);
    9. glClear(GL_COLOR_BUFFER_BIT);
    10.  
    11. glDisable(GL_SCISSOR_TEST);
    12.  
    13. painter.endNativePainting();

    See also endNativePainting().

    Look up this member in the source code.

    Toggle details QRectF QPainter

    boundingRectboundingRect ( const QRectF &rectangle , int flags , const QString &text ...) ( const QRectF &rectangle , int flags , const QString &text )

    Returns the bounding rectangle of the text as it will appear when drawn inside the given rectangle with the specified flags using the currently set font(); i.e the function tells you where the drawText() function will draw when given the same arguments.

    If the text does not fit within the given rectangle using the specified flags, the function returns the required rectangle.

    The flags argument is a bitwise OR of the following flags:

    If several of the horizontal or several of the vertical alignment flags are set, the resulting alignment is undefined.

    See also drawText(), Qt::Alignment, and Qt::TextFlag.

    Look up this member in the source code.

    Toggle details QRect QPainter

    boundingRectboundingRect ( const QRect &rectangle , int flags , const QString &text ...) ( const QRect &rectangle , int flags , const QString &text )

    This is an overloaded function.

    Returns the bounding rectangle of the text as it will appear when drawn inside the given rectangle with the specified flags using the currently set font().

    Look up this member in the source code.

    Toggle details QRect QPainter

    boundingRectboundingRect ( int x , int y , int w , int h , int flags , const QString &text ...) ( int x , int y , int w , int h , int flags , const QString &text )

    This is an overloaded function.

    Returns the bounding rectangle of the given text as it will appear when drawn inside the rectangle beginning at the point (x, y) with width w and height h.

    Look up this member in the source code.

    Toggle details QRectF QPainter

    boundingRectboundingRect ( const QRectF &rectangle , const QString &text , const QTextOption &option=QTextOption() ...) ( const QRectF &rectangle , const QString &text , const QTextOption &option=QTextOption() )

    This is an overloaded function.

    Instead of specifying flags as a bitwise OR of the Qt::AlignmentFlag and Qt::TextFlag, this overloaded function takes an option argument. The QTextOption class provides a description of general rich text properties.

    See also QTextOption.

    Look up this member in the source code.

    Toggle details const QBrush & QPainter

    brushbrush () ()const

    Returns the painter's current brush.

    See also QPainter::setBrush() and Settings.

    Look up this member in the source code.

    Toggle details QPoint QPainter

    brushOriginbrushOrigin () ()const

    Returns the currently set brush origin.

    See also setBrushOrigin() and Settings.

    Look up this member in the source code.

    Toggle details QPainterPath QPainter

    clipPathclipPath () ()const

    Returns the currently clip as a path. Note that the clip path is given in logical coordinates.

    Warning: QPainter does not store the combined clip explicitly as this is handled by the underlying QPaintEngine, so the path is recreated on demand and transformed to the current logical coordinate system. This is potentially an expensive operation.

    See also setClipPath(), clipRegion(), and setClipping().

    Look up this member in the source code.

    Toggle details QRegion QPainter

    clipRegionclipRegion () ()const

    Returns the currently set clip region. Note that the clip region is given in logical coordinates.

    Warning: QPainter does not store the combined clip explicitly as this is handled by the underlying QPaintEngine, so the path is recreated on demand and transformed to the current logical coordinate system. This is potentially an expensive operation.

    See also setClipRegion(), clipPath(), and setClipping().

    Look up this member in the source code.

    Toggle details QTransform QPainter

    combinedTransformcombinedTransform () ()const

    Returns the transformation matrix combining the current window/viewport and world transformation.

    See also setWorldTransform(), setWindow(), and setViewport().

    Look up this member in the source code.

    Toggle details CompositionMode QPainter

    compositionModecompositionMode () ()const

    Returns the current composition mode.

    See also CompositionMode and setCompositionMode().

    Look up this member in the source code.

    Toggle details QPaintDevice * QPainter

    devicedevice () ()const

    Returns the paint device on which this painter is currently painting, or 0 if the painter is not active.

    See also isActive().

    Look up this member in the source code.

    Toggle details const QTransform & QPainter

    deviceTransformdeviceTransform () ()const

    Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.

    This function is only needed when using platform painting commands on the platform dependent handle (Qt::HANDLE), and the platform does not do transformations nativly.

    The QPaintEngine::PaintEngineFeature enum can be queried to determine whether the platform performs the transformations or not.

    See also worldTransform() and QPaintEngine::hasFeature().

    Look up this member in the source code.

    Toggle details void QPainter

    drawArcdrawArc ( const QRectF &rectangle , int startAngle , int spanAngle ...) ( const QRectF &rectangle , int startAngle , int spanAngle )

    Draws the arc defined by the given rectangle, startAngle and spanAngle.

    The startAngle and spanAngle must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360). Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

    1.                                         QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    2. int startAngle = 30 * 16;
    3. int spanAngle = 120 * 16;
    4.  
    5. QPainter painter(this);
    6. painter.drawArc(rectangle, startAngle, spanAngle);

    See also drawPie(), drawChord(), and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawArcdrawArc ( const QRect &rectangle , int startAngle , int spanAngle ...) ( const QRect &rectangle , int startAngle , int spanAngle )

    This is an overloaded function.

    Draws the arc defined by the given rectangle, startAngle and spanAngle.

    Look up this member in the source code.

    Toggle details void QPainter

    drawArcdrawArc ( int x , int y , int width , int height , int startAngle , int spanAngle ...) ( int x , int y , int width , int height , int startAngle , int spanAngle )

    This is an overloaded function.

    Draws the arc defined by the rectangle beginning at (x, y) with the specified width and height, and the given startAngle and spanAngle.

    Look up this member in the source code.

    Toggle details void QPainter

    drawChorddrawChord ( const QRectF &rectangle , int startAngle , int spanAngle ...) ( const QRectF &rectangle , int startAngle , int spanAngle )

    Draws the chord defined by the given rectangle, startAngle and spanAngle. The chord is filled with the current brush().

    The startAngle and spanAngle must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360). Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

    1.                                         QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    2. int startAngle = 30 * 16;
    3. int spanAngle = 120 * 16;
    4.  
    5. QPainter painter(this);
    6. painter.drawChord(rect, startAngle, spanAngle);

    See also drawArc(), drawPie(), and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawChorddrawChord ( const QRect &rectangle , int startAngle , int spanAngle ...) ( const QRect &rectangle , int startAngle , int spanAngle )

    This is an overloaded function.

    Draws the chord defined by the given rectangle, startAngle and spanAngle.

    Look up this member in the source code.

    Toggle details void QPainter

    drawChorddrawChord ( int x , int y , int width , int height , int startAngle , int spanAngle ...) ( int x , int y , int width , int height , int startAngle , int spanAngle )

    This is an overloaded function.

    Draws the chord defined by the rectangle beginning at (x, y) with the specified width and height, and the given startAngle and spanAngle.

    Look up this member in the source code.

    Toggle details void QPainter

    drawConvexPolygondrawConvexPolygon ( const QPointF *points , int pointCount ...) ( const QPointF *points , int pointCount )

    Draws the convex polygon defined by the first pointCount points in the array points using the current pen.

    1. static const QPointF points[4] =  {
    2.     QPointF(10.0, 80.0),
    3.     QPointF(20.0, 10.0),
    4.     QPointF(80.0, 30.0),
    5.     QPointF(90.0, 70.0)
    6. };
    7.  
    8. QPainter painter(this);
    9. painter.drawConvexPolygon(points, 4);

    The first point is implicitly connected to the last point, and the polygon is filled with the current brush(). If the supplied polygon is not convex, i.e. it contains at least one angle larger than 180 degrees, the results are undefined.

    On some platforms (e.g. X11), the drawConvexPolygon() function can be faster than the drawPolygon() function.

    See also drawPolygon(), drawPolyline(), and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawConvexPolygondrawConvexPolygon ( const QPoint *points , int pointCount ...) ( const QPoint *points , int pointCount )

    This is an overloaded function.

    Draws the convex polygon defined by the first pointCount points in the array points using the current pen.

    Look up this member in the source code.

    Toggle details void QPainter

    drawConvexPolygondrawConvexPolygon ( const QPolygonF &polygon ) ( const QPolygonF &polygon )

    This is an overloaded function.

    Draws the convex polygon defined by polygon using the current pen and brush.

    Look up this member in the source code.

    Toggle details void QPainter

    drawConvexPolygondrawConvexPolygon ( const QPolygon &polygon ) ( const QPolygon &polygon )

    This is an overloaded function.

    Draws the convex polygon defined by polygon using the current pen and brush.

    Look up this member in the source code.

    Toggle details void QPainter

    drawEllipsedrawEllipse ( const QRectF &rectangle ) ( const QRectF &rectangle )

    Draws the ellipse defined by the given rectangle.

    A filled ellipse has a size of rectangle.size(). A stroked ellipse has a size of rectangle.size() plus the pen width.

    1.                                         QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    2.  
    3. QPainter painter(this);
    4. painter.drawEllipse(rectangle);

    See also drawPie() and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawEllipsedrawEllipse ( const QRect &rectangle ) ( const QRect &rectangle )

    This is an overloaded function.

    Draws the ellipse defined by the given rectangle.

    Look up this member in the source code.

    Toggle details void QPainter

    drawEllipsedrawEllipse ( int x , int y , int width , int height ...) ( int x , int y , int width , int height )

    This is an overloaded function.

    Draws the ellipse defined by the rectangle beginning at (x, y) with the given width and height.

    Look up this member in the source code.

    Toggle details void QPainter

    drawEllipsedrawEllipse ( const QPointF &center , qreal rx , qreal ry ...) ( const QPointF &center , qreal rx , qreal ry )

    This is an overloaded function.

    Draws the ellipse positioned at center with radii rx and ry.

    Look up this member in the source code.

    Toggle details void QPainter

    drawEllipsedrawEllipse ( const QPoint &center , int rx , int ry ...) ( const QPoint &center , int rx , int ry )

    This is an overloaded function.

    Draws the ellipse positioned at center with radii rx and ry.

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( const QRectF &target , const QImage &image , const QRectF &source , Qt::ImageConversionFlags flags=Qt::AutoColor ...) ( const QRectF &target , const QImage &image , const QRectF &source , Qt::ImageConversionFlags flags=Qt::AutoColor )

    Draws the rectangular portion source of the given image into the target rectangle in the paint device.

    Note: The image is scaled to fit the rectangle, if both the image and rectangle size disagree.

    If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the flags to specify how you would prefer this to happen.

    1.                                         QRectF target(10.0, 20.0, 80.0, 60.0);
    2. QRectF source(0.0, 0.0, 70.0, 40.0);
    3. QImage image(":/images/myImage.png");
    4.  
    5. QPainter painter(this);
    6. painter.drawImage(target, image, source);

    See also drawPixmap().

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( const QRect &target , const QImage &image , const QRect &source , Qt::ImageConversionFlags flags=Qt::AutoColor ...) ( const QRect &target , const QImage &image , const QRect &source , Qt::ImageConversionFlags flags=Qt::AutoColor )

    This is an overloaded function.

    Draws the rectangular portion source of the given image into the target rectangle in the paint device.

    Note: The image is scaled to fit the rectangle, if both the image and rectangle size disagree.

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( const QPointF &point , const QImage &image ...) ( const QPointF &point , const QImage &image )

    This is an overloaded function.

    Draws the given image at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( const QPoint &point , const QImage &image ...) ( const QPoint &point , const QImage &image )

    This is an overloaded function.

    Draws the given image at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( const QPointF &point , const QImage &image , const QRectF &source , Qt::ImageConversionFlags flags=Qt::AutoColor ...) ( const QPointF &point , const QImage &image , const QRectF &source , Qt::ImageConversionFlags flags=Qt::AutoColor )

    This is an overloaded function.

    Draws the rectangular portion source of the given image with its origin at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( const QPoint &point , const QImage &image , const QRect &source , Qt::ImageConversionFlags flags=Qt::AutoColor ...) ( const QPoint &point , const QImage &image , const QRect &source , Qt::ImageConversionFlags flags=Qt::AutoColor )

    This is an overloaded function.

    Draws the rectangular portion source of the given image with its origin at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( const QRectF &rectangle , const QImage &image ...) ( const QRectF &rectangle , const QImage &image )

    This is an overloaded function.

    Draws the given image into the given rectangle.

    Note: The image is scaled to fit the rectangle, if both the image and rectangle size disagree.

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( const QRect &rectangle , const QImage &image ...) ( const QRect &rectangle , const QImage &image )

    This is an overloaded function.

    Draws the given image into the given rectangle.

    Note: The image is scaled to fit the rectangle, if both the image and rectangle size disagree.

    Look up this member in the source code.

    Toggle details void QPainter

    drawImagedrawImage ( int x , int y , const QImage &image , int sx=0 , int sy=0 , int sw=-1 , int sh=-1 , Qt::ImageConversionFlags flags=Qt::AutoColor ...) ( int x , int y , const QImage &image , int sx=0 , int sy=0 , int sw=-1 , int sh=-1 , Qt::ImageConversionFlags flags=Qt::AutoColor )

    This is an overloaded function.

    Draws an image at (x, y) by copying a part of image into the paint device.

    (x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

    (sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinedrawLine ( const QLineF &line ) ( const QLineF &line )

    Draws a line defined by line.

    1.                                         QLineF line(10.0, 80.0, 90.0, 20.0);
    2.  
    3. QPainter(this);
    4. painter.drawLine(line);

    See also drawLines(), drawPolyline(), and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinedrawLine ( const QLine &line ) ( const QLine &line )

    This is an overloaded function.

    Draws a line defined by line.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinedrawLine ( const QPoint &p1 , const QPoint &p2 ) ( const QPoint &p1 , const QPoint &p2 )

    This is an overloaded function.

    Draws a line from p1 to p2.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinedrawLine ( const QPointF &p1 , const QPointF &p2 ...) ( const QPointF &p1 , const QPointF &p2 )

    This is an overloaded function.

    Draws a line from p1 to p2.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinedrawLine ( int x1 , int y1 , int x2 , int y2 ) ( int x1 , int y1 , int x2 , int y2 )

    This is an overloaded function.

    Draws a line from (x1, y1) to (x2, y2) and sets the current pen position to (x2, y2).

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinesdrawLines ( const QLineF *lines , int lineCount ( const QLineF *lines , int lineCount )

    Draws the first lineCount lines in the array lines using the current pen.

    See also drawLine() and drawPolyline().

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinesdrawLines ( const QLine *lines , int lineCount ) ( const QLine *lines , int lineCount )

    This is an overloaded function.

    Draws the first lineCount lines in the array lines using the current pen.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinesdrawLines ( const QPointF *pointPairs , int lineCount ...) ( const QPointF *pointPairs , int lineCount )

    This is an overloaded function.

    Draws the first lineCount lines in the array pointPairs using the current pen. The lines are specified as pairs of points so the number of entries in pointPairs must be at least lineCount * 2.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinesdrawLines ( const QPoint *pointPairs , int lineCount ...) ( const QPoint *pointPairs , int lineCount )

    This is an overloaded function.

    Draws the first lineCount lines in the array pointPairs using the current pen.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinesdrawLines ( const QVector <QPointF > &pointPairs ( const QVector <QPointF > &pointPairs )

    This is an overloaded function.

    Draws a line for each pair of points in the vector pointPairs using the current pen. If there is an odd number of points in the array, the last point will be ignored.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinesdrawLines ( const QVector <QPoint > &pointPairs ) ( const QVector <QPoint > &pointPairs )

    This is an overloaded function.

    Draws a line for each pair of points in the vector pointPairs using the current pen.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinesdrawLines ( const QVector <QLineF > &lines ) ( const QVector <QLineF > &lines )

    This is an overloaded function.

    Draws the set of lines defined by the list lines using the current pen and brush.

    Look up this member in the source code.

    Toggle details void QPainter

    drawLinesdrawLines ( const QVector <QLine > &lines ) ( const QVector <QLine > &lines )

    This is an overloaded function.

    Draws the set of lines defined by the list lines using the current pen and brush.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPathdrawPath ( const QPainterPath &path ) ( const QPainterPath &path )

    Draws the given painter path using the current pen for outline and the current brush for filling.

    1.                                         QPainterPath path;
    2. path.moveTo(20, 80);
    3. path.lineTo(20, 30);
    4. path.cubicTo(80, 0, 50, 50, 80, 80);
    5.  
    6. QPainter painter(this);
    7. painter.drawPath(path);

    See also the Painter Paths example and the Vector Deformation demo.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPicturedrawPicture ( const QPointF &point , const QPicture &picture ...) ( const QPointF &point , const QPicture &picture )

    Replays the given picture at the given point.

    The QPicture class is a paint device that records and replays QPainter commands. A picture serializes the painter commands to an IO device in a platform-independent format. Everything that can be painted on a widget or pixmap can also be stored in a picture.

    This function does exactly the same as QPicture::play() when called with point = QPoint(0, 0).

    1.                                         QPicture picture;
    2. QPointF point(10.0, 20.0)
    3. picture.load("drawing.pic");
    4.  
    5. QPainter painter(this);
    6. painter.drawPicture(0, 0, picture);

    See also QPicture::play().

    Look up this member in the source code.

    Toggle details void QPainter

    drawPicturedrawPicture ( const QPoint &point , const QPicture &picture ...) ( const QPoint &point , const QPicture &picture )

    This is an overloaded function.

    Replays the given picture at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPicturedrawPicture ( int x , int y , const QPicture &picture ...) ( int x , int y , const QPicture &picture )

    This is an overloaded function.

    Draws the given picture at point (x, y).

    Look up this member in the source code.

    Toggle details void QPainter

    drawPiedrawPie ( const QRectF &rectangle , int startAngle , int spanAngle ...) ( const QRectF &rectangle , int startAngle , int spanAngle )

    Draws a pie defined by the given rectangle, startAngle and and spanAngle.

    The pie is filled with the current brush().

    The startAngle and spanAngle must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360). Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

    1.                                         QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    2. int startAngle = 30 * 16;
    3. int spanAngle = 120 * 16;
    4.  
    5. QPainter painter(this);
    6. painter.drawPie(rectangle, startAngle, spanAngle);

    See also drawEllipse(), drawChord(), and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPiedrawPie ( const QRect &rectangle , int startAngle , int spanAngle ...) ( const QRect &rectangle , int startAngle , int spanAngle )

    This is an overloaded function.

    Draws a pie defined by the given rectangle, startAngle and and spanAngle.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPiedrawPie ( int x , int y , int width , int height , int startAngle , int spanAngle ...) ( int x , int y , int width , int height , int startAngle , int spanAngle )

    This is an overloaded function.

    Draws the pie defined by the rectangle beginning at (x, y) with the specified width and height, and the given startAngle and spanAngle.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( const QRectF &target , const QPixmap &pixmap , const QRectF &source ...) ( const QRectF &target , const QPixmap &pixmap , const QRectF &source )

    Draws the rectangular portion source of the given pixmap into the given target in the paint device.

    Note: The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree.

    1.                                         QRectF target(10.0, 20.0, 80.0, 60.0);
    2. QRectF source(0.0, 0.0, 70.0, 40.0);
    3. QPixmap pixmap(":myPixmap.png");
    4.  
    5. QPainter(this);
    6. painter.drawPixmap(target, image, source);

    If pixmap is a QBitmap it is drawn with the bits that are "set" using the pens color. If backgroundMode is Qt::OpaqueMode, the "unset" bits are drawn using the color of the background brush; if backgroundMode is Qt::TransparentMode, the "unset" bits are transparent. Drawing bitmaps with gradient or texture colors is not supported.

    See also drawImage().

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( const QRect &target , const QPixmap &pixmap , const QRect &source ...) ( const QRect &target , const QPixmap &pixmap , const QRect &source )

    This is an overloaded function.

    Draws the rectangular portion source of the given pixmap into the given target in the paint device.

    Note: The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( const QPointF &point , const QPixmap &pixmap , const QRectF &source ...) ( const QPointF &point , const QPixmap &pixmap , const QRectF &source )

    This is an overloaded function.

    Draws the rectangular portion source of the given pixmap with its origin at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( const QPoint &point , const QPixmap &pixmap , const QRect &source ...) ( const QPoint &point , const QPixmap &pixmap , const QRect &source )

    This is an overloaded function.

    Draws the rectangular portion source of the given pixmap with its origin at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( const QPointF &point , const QPixmap &pixmap ...) ( const QPointF &point , const QPixmap &pixmap )

    This is an overloaded function.

    Draws the given pixmap with its origin at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( const QPoint &point , const QPixmap &pixmap ...) ( const QPoint &point , const QPixmap &pixmap )

    This is an overloaded function.

    Draws the given pixmap with its origin at the given point.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( int x , int y , const QPixmap &pixmap ...) ( int x , int y , const QPixmap &pixmap )

    This is an overloaded function.

    Draws the given pixmap at position (x, y).

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( const QRect &rectangle , const QPixmap &pixmap ...) ( const QRect &rectangle , const QPixmap &pixmap )

    This is an overloaded function.

    Draws the given pixmap into the given rectangle.

    Note: The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( int x , int y , int width , int height , const QPixmap &pixmap ...) ( int x , int y , int width , int height , const QPixmap &pixmap )

    This is an overloaded function.

    Draws the pixmap into the rectangle at position (x, y) with the given width and height.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( int x , int y , int w , int h , const QPixmap &pixmap , int sx , int sy , int sw , int sh ...) ( int x , int y , int w , int h , const QPixmap &pixmap , int sx , int sy , int sw , int sh )

    This is an overloaded function.

    Draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the given pixmap , at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy;

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapdrawPixmap ( int x , int y , const QPixmap &pixmap , int sx , int sy , int sw , int sh ...) ( int x , int y , const QPixmap &pixmap , int sx , int sy , int sw , int sh )

    This is an overloaded function.

    Draws a pixmap at (x, y) by copying a part of the given pixmap into the paint device.

    (x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in pixmap that is to be drawn. The default is (0, 0).

    (sw, sh) specifies the size of the pixmap that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the pixmap.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPixmapFragmentsdrawPixmapFragments ( const PixmapFragment *fragments , int fragmentCount , const QPixmap &pixmap , PixmapFragmentHints hints=0 ...) ( const PixmapFragment *fragments , int fragmentCount , const QPixmap &pixmap , PixmapFragmentHints hints=0 )

    This function is used to draw pixmap, or a sub-rectangle of pixmap, at multiple positions with different scale, rotation and opacity. fragments is an array of fragmentCount elements specifying the parameters used to draw each pixmap fragment. The hints parameter can be used to pass in drawing hints.

    This function is potentially faster than multiple calls to drawPixmap(), since the backend can optimize state changes.

    See also QPainter::PixmapFragment and QPainter::PixmapFragmentHint.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPointdrawPoint ( const QPointF &position ) ( const QPointF &position )

    Draws a single point at the given position using the current pen's color.

    See also Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPointdrawPoint ( const QPoint &position ) ( const QPoint &position )

    This is an overloaded function.

    Draws a single point at the given position using the current pen's color.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPointdrawPoint ( int x , int y ) ( int x , int y )

    This is an overloaded function.

    Draws a single point at position (x, y).

    Look up this member in the source code.

    Toggle details void QPainter

    drawPointsdrawPoints ( const QPointF *points , int pointCount ...) ( const QPointF *points , int pointCount )

    Draws the first pointCount points in the array points using the current pen's color.

    See also Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPointsdrawPoints ( const QPoint *points , int pointCount ...) ( const QPoint *points , int pointCount )

    This is an overloaded function.

    Draws the first pointCount points in the array points using the current pen's color.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPointsdrawPoints ( const QPolygonF &points ) ( const QPolygonF &points )

    This is an overloaded function.

    Draws the points in the vector points.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPointsdrawPoints ( const QPolygon &points ) ( const QPolygon &points )

    This is an overloaded function.

    Draws the points in the vector points.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolygondrawPolygon ( const QPointF *points , int pointCount , Qt::FillRule fillRule=Qt::OddEvenFill ...) ( const QPointF *points , int pointCount , Qt::FillRule fillRule=Qt::OddEvenFill )

    Draws the polygon defined by the first pointCount points in the array points using the current pen and brush.

    1. static const QPointF points[4] =  {
    2.     QPointF(10.0, 80.0),
    3.     QPointF(20.0, 10.0),
    4.     QPointF(80.0, 30.0),
    5.     QPointF(90.0, 70.0)
    6. };
    7.  
    8. QPainter painter(this);
    9. painter.drawPolygon(points, 4);

    The first point is implicitly connected to the last point, and the polygon is filled with the current brush().

    If fillRule is Qt::WindingFill, the polygon is filled using the winding fill algorithm. If fillRule is Qt::OddEvenFill, the polygon is filled using the odd-even fill algorithm. See Qt::FillRule for a more detailed description of these fill rules.

    See also drawConvexPolygon(), drawPolyline(), and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolygondrawPolygon ( const QPoint *points , int pointCount , Qt::FillRule fillRule=Qt::OddEvenFill ...) ( const QPoint *points , int pointCount , Qt::FillRule fillRule=Qt::OddEvenFill )

    This is an overloaded function.

    Draws the polygon defined by the first pointCount points in the array points.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolygondrawPolygon ( const QPolygonF &points , Qt::FillRule fillRule=Qt::OddEvenFill ...) ( const QPolygonF &points , Qt::FillRule fillRule=Qt::OddEvenFill )

    This is an overloaded function.

    Draws the polygon defined by the given points using the fill rule fillRule.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolygondrawPolygon ( const QPolygon &points , Qt::FillRule fillRule=Qt::OddEvenFill ...) ( const QPolygon &points , Qt::FillRule fillRule=Qt::OddEvenFill )

    This is an overloaded function.

    Draws the polygon defined by the given points using the fill rule fillRule.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolylinedrawPolyline ( const QPointF *points , int pointCount ...) ( const QPointF *points , int pointCount )

    Draws the polyline defined by the first pointCount points in points using the current pen.

    Note that unlike the drawPolygon() function the last point is not connected to the first, neither is the polyline filled.

    1. static const QPointF points[3] =  {
    2.     QPointF(10.0, 80.0),
    3.     QPointF(20.0, 10.0),
    4.     QPointF(80.0, 30.0),
    5. };
    6.  
    7. QPainter painter(this);
    8. painter.drawPolyline(points, 3);

    See also drawLines(), drawPolygon(), and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolylinedrawPolyline ( const QPoint *points , int pointCount ...) ( const QPoint *points , int pointCount )

    This is an overloaded function.

    Draws the polyline defined by the first pointCount points in points using the current pen.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolylinedrawPolyline ( const QPolygonF &points ) ( const QPolygonF &points )

    This is an overloaded function.

    Draws the polyline defined by the given points using the current pen.

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolylinedrawPolyline ( const QPolygon &points ) ( const QPolygon &points )

    This is an overloaded function.

    Draws the polyline defined by the given points using the current pen.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRectdrawRect ( const QRectF &rectangle ) ( const QRectF &rectangle )

    Draws the current rectangle with the current pen and brush.

    A filled rectangle has a size of rectangle.size(). A stroked rectangle has a size of rectangle.size() plus the pen width.

    1.                                         QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    2.  
    3. QPainter painter(this);
    4. painter.drawRect(rectangle);

    See also drawRects(), drawPolygon(), and Coordinate System.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRectdrawRect ( const QRect &rectangle ) ( const QRect &rectangle )

    This is an overloaded function.

    Draws the current rectangle with the current pen and brush.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRectdrawRect ( int x , int y , int width , int height ( int x , int y , int width , int height )

    This is an overloaded function.

    Draws a rectangle with upper left corner at (x, y) and with the given width and height.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRectsdrawRects ( const QRectF *rectangles , int rectCount ...) ( const QRectF *rectangles , int rectCount )

    Draws the first rectCount of the given rectangles using the current pen and brush.

    See also drawRect().

    Look up this member in the source code.

    Toggle details void QPainter

    drawRectsdrawRects ( const QRect *rectangles , int rectCount ...) ( const QRect *rectangles , int rectCount )

    This is an overloaded function.

    Draws the first rectCount of the given rectangles using the current pen and brush.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRectsdrawRects ( const QVector <QRectF > &rectangles ) ( const QVector <QRectF > &rectangles )

    This is an overloaded function.

    Draws the given rectangles using the current pen and brush.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRectsdrawRects ( const QVector <QRect > &rectangles ) ( const QVector <QRect > &rectangles )

    This is an overloaded function.

    Draws the given rectangles using the current pen and brush.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRoundedRectdrawRoundedRect ( const QRectF &rect , qreal xRadius , qreal yRadius , Qt::SizeMode mode=Qt::AbsoluteSize ...) ( const QRectF &rect , qreal xRadius , qreal yRadius , Qt::SizeMode mode=Qt::AbsoluteSize )

    Draws the given rectangle rect with rounded corners.

    The xRadius and yRadius arguments specify the radii of the ellipses defining the corners of the rounded rectangle. When mode is Qt::RelativeSize, xRadius and yRadius are specified in percentage of half the rectangle's width and height respectively, and should be in the range 0.0 to 100.0.

    A filled rectangle has a size of rect.size(). A stroked rectangle has a size of rect.size() plus the pen width.

    1.                                         QRectF rectangle(10.0, 20.0, 80.0, 60.0);
    2.  
    3. QPainter painter(this);
    4. painter.drawRoundedRect(rectangle, 20.0, 15.0);

    See also drawRect() and QPen.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRoundedRectdrawRoundedRect ( const QRect &rect , qreal xRadius , qreal yRadius , Qt::SizeMode mode=Qt::AbsoluteSize ...) ( const QRect &rect , qreal xRadius , qreal yRadius , Qt::SizeMode mode=Qt::AbsoluteSize )

    This is an overloaded function.

    Draws the given rectangle rect with rounded corners.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRoundedRectdrawRoundedRect ( int x , int y , int w , int h , qreal xRadius , qreal yRadius , Qt::SizeMode mode=Qt::AbsoluteSize ...) ( int x , int y , int w , int h , qreal xRadius , qreal yRadius , Qt::SizeMode mode=Qt::AbsoluteSize )

    This is an overloaded function.

    Draws the given rectangle x, y, w, h with rounded corners.

    Look up this member in the source code.

    Toggle details void QPainter

    drawStaticTextdrawStaticText ( const QPointF &topLeftPosition , const QStaticText &staticText ...) ( const QPointF &topLeftPosition , const QStaticText &staticText )

    Draws the given staticText at the given topLeftPosition.

    The text will be drawn using the font and the transformation set on the painter. If the font and/or transformation set on the painter are different from the ones used to initialize the layout of the QStaticText, then the layout will have to be recalculated. Use QStaticText::prepare() to initialize staticText with the font and transformation with which it will later be drawn.

    If topLeftPosition is not the same as when staticText was initialized, or when it was last drawn, then there will be a slight overhead when translating the text to its new position.

    Note: If the painter's transformation is not affine, then staticText will be drawn using regular calls to drawText(), losing any potential for performance improvement.

    Note: The y-position is used as the top of the font.

    See also QStaticText.

    Look up this member in the source code.

    Toggle details void QPainter

    drawStaticTextdrawStaticText ( const QPoint &topLeftPosition , const QStaticText &staticText ...) ( const QPoint &topLeftPosition , const QStaticText &staticText )

    This is an overloaded function.

    Draws the staticText at the topLeftPosition.

    Note: The y-position is used as the top of the font.

    Look up this member in the source code.

    Toggle details void QPainter

    drawStaticTextdrawStaticText ( int left , int top , const QStaticText &staticText ...) ( int left , int top , const QStaticText &staticText )

    This is an overloaded function.

    Draws the staticText at coordinates left and top.

    Note: The y-position is used as the top of the font.

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( const QPointF &position , const QString &text ...) ( const QPointF &position , const QString &text )

    Draws the given text with the currently defined text direction, beginning at the given position.

    This function does not handle the newline character (\n), as it cannot break text into multiple lines, and it cannot display the newline character. Use the QPainter::drawText() overload that takes a rectangle instead if you want to draw multiple lines of text with the newline character, or if you want the text to be wrapped.

    By default, QPainter draws text anti-aliased.

    Note: The y-position is used as the baseline of the font.

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( const QPoint &position , const QString &text ...) ( const QPoint &position , const QString &text )

    This is an overloaded function.

    Draws the given text with the currently defined text direction, beginning at the given position.

    By default, QPainter draws text anti-aliased.

    Note: The y-position is used as the baseline of the font.

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( const QRectF &rectangle , int flags , const QString &text , QRectF *boundingRect=0 ...) ( const QRectF &rectangle , int flags , const QString &text , QRectF *boundingRect=0 )

    This is an overloaded function.

    Draws the given text within the provided rectangle.

    1.                                         QPainter painter(this);
    2. painter.drawText(rect, Qt::AlignCenter, tr("Qt by\nNokia"));

    The boundingRect (if not null) is set to the what the bounding rectangle should be in order to enclose the whole text. The flags argument is a bitwise OR of the following flags:

    By default, QPainter draws text anti-aliased.

    Note: The y-coordinate of rectangle is used as the top of the font.

    See also Qt::AlignmentFlag, Qt::TextFlag, boundingRect(), and layoutDirection().

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( const QRect &rectangle , int flags , const QString &text , QRect *boundingRect=0 ...) ( const QRect &rectangle , int flags , const QString &text , QRect *boundingRect=0 )

    This is an overloaded function.

    Draws the given text within the provided rectangle according to the specified flags. The boundingRect (if not null) is set to the what the bounding rectangle should be in order to enclose the whole text.

    By default, QPainter draws text anti-aliased.

    Note: The y-coordinate of rectangle is used as the top of the font.

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( int x , int y , const QString &text ) ( int x , int y , const QString &text )

    This is an overloaded function.

    Draws the given text at position (x, y), using the painter's currently defined text direction.

    By default, QPainter draws text anti-aliased.

    Note: The y-position is used as the baseline of the font.

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( int x , int y , int width , int height , int flags , const QString &text , QRect *boundingRect=0 ...) ( int x , int y , int width , int height , int flags , const QString &text , QRect *boundingRect=0 )

    This is an overloaded function.

    Draws the given text within the rectangle with origin (x, y), width and height.

    The boundingRect (if not null) is set to the actual bounding rectangle of the output. The flags argument is a bitwise OR of the following flags:

    By default, QPainter draws text anti-aliased.

    Note: The y-position is used as the top of the font.

    See also Qt::AlignmentFlag and Qt::TextFlag.

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( const QRectF &rectangle , const QString &text , const QTextOption &option=QTextOption() ...) ( const QRectF &rectangle , const QString &text , const QTextOption &option=QTextOption() )

    This is an overloaded function.

    Draws the given text in the rectangle specified using the option to control its positioning and orientation.

    By default, QPainter draws text anti-aliased.

    Note: The y-coordinate of rectangle is used as the top of the font.

    Look up this member in the source code.

    Toggle details void QPainter

    drawTiledPixmapdrawTiledPixmap ( const QRectF &rectangle , const QPixmap &pixmap , const QPointF &position=QPointF() ...) ( const QRectF &rectangle , const QPixmap &pixmap , const QPointF &position=QPointF() )

    Draws a tiled pixmap, inside the given rectangle with its origin at the given position.

    Calling drawTiledPixmap() is similar to calling drawPixmap() several times to fill (tile) an area with a pixmap, but is potentially much more efficient depending on the underlying window system.

    See also drawPixmap().

    Look up this member in the source code.

    Toggle details void QPainter

    drawTiledPixmapdrawTiledPixmap ( const QRect &rectangle , const QPixmap &pixmap , const QPoint &position=QPoint() ...) ( const QRect &rectangle , const QPixmap &pixmap , const QPoint &position=QPoint() )

    This is an overloaded function.

    Draws a tiled pixmap, inside the given rectangle with its origin at the given position.

    Look up this member in the source code.

    Toggle details void QPainter

    drawTiledPixmapdrawTiledPixmap ( int x , int y , int width , int height , const QPixmap &pixmap , int sx=0 , int sy=0 ...) ( int x , int y , int width , int height , const QPixmap &pixmap , int sx=0 , int sy=0 )

    This is an overloaded function.

    Draws a tiled pixmap in the specified rectangle.

    (x, y) specifies the top-left point in the paint device that is to be drawn onto; with the given width and height. (sx, sy) specifies the top-left point in the pixmap that is to be drawn; this defaults to (0, 0).

    Look up this member in the source code.

    Toggle details bool QPainter

    endend () ()

    Ends painting. Any resources used while painting are released. You don't normally need to call this since it is called by the destructor.

    Returns true if the painter is no longer active; otherwise returns false.

    See also begin() and isActive().

    Look up this member in the source code.

    Toggle details void QPainter

    endNativePaintingendNativePainting () ()

    Restores the painter after manually issuing native painting commands. Lets the painter restore any native state that it relies on before calling any other painter commands.

    See also beginNativePainting().

    Look up this member in the source code.

    Toggle details void QPainter

    eraseRecteraseRect ( const QRectF &rectangle ) ( const QRectF &rectangle )

    Erases the area inside the given rectangle. Equivalent to calling

    1. fillRect(rectangle, background()).

    See also fillRect().

    Look up this member in the source code.

    Toggle details void QPainter

    eraseRecteraseRect ( const QRect &rectangle ) ( const QRect &rectangle )

    This is an overloaded function.

    Erases the area inside the given rectangle.

    Look up this member in the source code.

    Toggle details void QPainter

    eraseRecteraseRect ( int x , int y , int width , int height ...) ( int x , int y , int width , int height )

    This is an overloaded function.

    Erases the area inside the rectangle beginning at (x, y) with the given width and height.

    Look up this member in the source code.

    Toggle details void QPainter

    fillPathfillPath ( const QPainterPath &path , const QBrush &brush ...) ( const QPainterPath &path , const QBrush &brush )

    Fills the given path using the given brush. The outline is not drawn.

    Alternatively, you can specify a QColor instead of a QBrush; the QBrush constructor (taking a QColor argument) will automatically create a solid pattern brush.

    See also drawPath().

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( const QRectF &rectangle , const QBrush &brush ...) ( const QRectF &rectangle , const QBrush &brush )

    Fills the given rectangle with the brush specified.

    Alternatively, you can specify a QColor instead of a QBrush; the QBrush constructor (taking a QColor argument) will automatically create a solid pattern brush.

    See also drawRect().

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( int x , int y , int width , int height , Qt::BrushStyle style ...) ( int x , int y , int width , int height , Qt::BrushStyle style )

    This is an overloaded function.

    Fills the rectangle beginning at (x, y) with the given width and height, using the brush style specified.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( const QRect &rectangle , Qt::BrushStyle style ...) ( const QRect &rectangle , Qt::BrushStyle style )

    This is an overloaded function.

    Fills the given rectangle with the brush style specified.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( const QRectF &rectangle , Qt::BrushStyle style ...) ( const QRectF &rectangle , Qt::BrushStyle style )

    This is an overloaded function.

    Fills the given rectangle with the brush style specified.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( const QRect &rectangle , const QBrush &brush ...) ( const QRect &rectangle , const QBrush &brush )

    This is an overloaded function.

    Fills the given rectangle with the specified brush.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( const QRect &rectangle , const QColor &color ...) ( const QRect &rectangle , const QColor &color )

    This is an overloaded function.

    Fills the given rectangle with the color specified.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( const QRectF &rectangle , const QColor &color ...) ( const QRectF &rectangle , const QColor &color )

    This is an overloaded function.

    Fills the given rectangle with the color specified.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( int x , int y , int width , int height , const QBrush &brush ...) ( int x , int y , int width , int height , const QBrush &brush )

    This is an overloaded function.

    Fills the rectangle beginning at (x, y) with the given width and height, using the given brush.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( int x , int y , int width , int height , const QColor &color ...) ( int x , int y , int width , int height , const QColor &color )

    This is an overloaded function.

    Fills the rectangle beginning at (x, y) with the given width and height, using the given color.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( int x , int y , int width , int height , Qt::GlobalColor color ...) ( int x , int y , int width , int height , Qt::GlobalColor color )

    This is an overloaded function.

    Fills the rectangle beginning at (x, y) with the given width and height, using the given color.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( const QRect &rectangle , Qt::GlobalColor color ...) ( const QRect &rectangle , Qt::GlobalColor color )

    This is an overloaded function.

    Fills the given rectangle with the specified color.

    Look up this member in the source code.

    Toggle details void QPainter

    fillRectfillRect ( const QRectF &rectangle , Qt::GlobalColor color ...) ( const QRectF &rectangle , Qt::GlobalColor color )

    This is an overloaded function.

    Fills the given rectangle with the specified color.

    Look up this member in the source code.

    Toggle details const QFont & QPainter

    fontfont () ()const

    Returns the currently set font used for drawing text.

    See also setFont(), drawText(), and Settings.

    Look up this member in the source code.

    Toggle details QFontInfo QPainter

    fontInfofontInfo () ()const

    Returns the font info for the painter if the painter is active. Otherwise, the return value is undefined.

    See also font(), isActive(), and Settings.

    Look up this member in the source code.

    Toggle details QFontMetrics QPainter

    fontMetricsfontMetrics () ()const

    Returns the font metrics for the painter if the painter is active. Otherwise, the return value is undefined.

    See also font(), isActive(), and Settings.

    Look up this member in the source code.

    Toggle details bool QPainter

    hasClippinghasClipping () ()const

    Returns true if clipping has been set; otherwise returns false.

    See also setClipping() and Clipping.

    Look up this member in the source code.

    Toggle details void QPainter

    initFrominitFrom ( const QWidget *widget ) ( const QWidget *widget )

    Initializes the painters pen, background and font to the same as the given widget. This function is called automatically when the painter is opened on a QWidget.

    See also begin() and Settings.

    Look up this member in the source code.

    Toggle details bool QPainter

    isActiveisActive () ()const

    Returns true if begin() has been called and end() has not yet been called; otherwise returns false.

    See also begin() and QPaintDevice::paintingActive().

    Look up this member in the source code.

    Toggle details Qt::LayoutDirection QPainter

    layoutDirectionlayoutDirection () ()const

    Returns the layout direction used by the painter when drawing text.

    See also QTextOption::textDirection(), setLayoutDirection(), drawText(), and Settings.

    Look up this member in the source code.

    Toggle details qreal QPainter

    opacityopacity () ()const

    Returns the opacity of the painter. The default value is 1.

    See also setOpacity().

    Look up this member in the source code.

    Toggle details QPaintEngine * QPainter

    paintEnginepaintEngine () ()const

    Returns the paint engine that the painter is currently operating on if the painter is active; otherwise 0.

    See also isActive().

    Look up this member in the source code.

    Toggle details const QPen & QPainter

    penpen () ()const

    Returns the painter's current pen.

    See also setPen() and Settings.

    Look up this member in the source code.

    Toggle details RenderHints QPainter

    renderHintsrenderHints () ()const

    Returns a flag that specifies the rendering hints that are set for this painter.

    See also setRenderHints(), testRenderHint(), and Rendering Quality.

    Look up this member in the source code.

    Toggle details void QPainter

    resetTransformresetTransform () ()

    Resets any transformations that were made using translate(), scale(), shear(), rotate(), setWorldTransform(), setViewport() and setWindow().

    See also Coordinate Transformations.

    Look up this member in the source code.

    Toggle details void QPainter

    restorerestore () ()

    Restores the current painter state (pops a saved state off the stack).

    See also save().

    Look up this member in the source code.

    Toggle details void QPainter

    rotaterotate ( qreal angle ) ( qreal angle )

    Rotates the coordinate system the given angle clockwise.

    See also setWorldTransform() and Coordinate Transformations.

    Look up this member in the source code.

    Toggle details void QPainter

    savesave () ()

    Saves the current painter state (pushes the state onto a stack). A save() must be followed by a corresponding restore(); the end() function unwinds the stack.

    See also restore().

    Look up this member in the source code.

    Toggle details void QPainter

    scalescale ( qreal sx , qreal sy ) ( qreal sx , qreal sy )

    Scales the coordinate system by (sx, sy).

    See also setWorldTransform() and Coordinate Transformations.

    Look up this member in the source code.

    Toggle details void QPainter

    setBackgroundsetBackground ( const QBrush &brush ) ( const QBrush &brush )

    Sets the background brush of the painter to the given brush.

    The background brush is the brush that is filled in when drawing opaque text, stippled lines and bitmaps. The background brush has no effect in transparent background mode (which is the default).

    See also background(), setBackgroundMode(), and Settings.

    Look up this member in the source code.

    Toggle details void QPainter

    setBackgroundModesetBackgroundMode ( Qt::BGMode mode ) ( Qt::BGMode mode )

    Sets the background mode of the painter to the given mode

    Qt::TransparentMode (the default) draws stippled lines and text without setting the background pixels. Qt::OpaqueMode fills these space with the current background color.

    Note that in order to draw a bitmap or pixmap transparently, you must use QPixmap::setMask().

    See also backgroundMode(), setBackground(), and Settings.

    Look up this member in the source code.

    Toggle details void QPainter

    setBrushsetBrush ( const QBrush &brush ) ( const QBrush &brush )

    Sets the painter's brush to the given brush.

    The painter's brush defines how shapes are filled.

    See also brush() and Settings.

    Look up this member in the source code.

    Toggle details void QPainter

    setBrushsetBrush ( Qt::BrushStyle style ) ( Qt::BrushStyle style )

    This is an overloaded function.

    Sets the painter's brush to black color and the specified style.

    Look up this member in the source code.

    Toggle details void QPainter

    setBrushOriginsetBrushOrigin ( const QPointF &position ) ( const QPointF &position )

    Sets the brush origin to position.

    The brush origin specifies the (0, 0) coordinate of the painter's brush.

    Note that while the brushOrigin() was necessary to adopt the parent's background for a widget in Qt 3, this is no longer the case since the Qt 4 painter doesn't paint the background unless you explicitly tell it to do so by setting the widget's autoFillBackground property to true.

    See also brushOrigin() and Settings.

    Look up this member in the source code.

    Toggle details void QPainter

    setBrushOriginsetBrushOrigin ( const QPoint &position ) ( const QPoint &position )

    This is an overloaded function.

    Sets the brush's origin to the given position.

    Look up this member in the source code.

    Toggle details void QPainter

    setBrushOriginsetBrushOrigin ( int x , int y ) ( int x , int y )

    This is an overloaded function.

    Sets the brush's origin to point (x, y).

    Look up this member in the source code.

    Toggle details void QPainter

    setClipPathsetClipPath ( const QPainterPath &path , Qt::ClipOperation operation=Qt::ReplaceClip ...) ( const QPainterPath &path , Qt::ClipOperation operation=Qt::ReplaceClip )

    Enables clipping, and sets the clip path for the painter to the given path, with the clip operation.

    Note that the clip path is specified in logical (painter) coordinates.

    See also clipPath(), clipRegion(), and Clipping.

    Look up this member in the source code.

    Toggle details void QPainter

    setClipRectsetClipRect ( const QRectF &rectangle , Qt::ClipOperation operation=Qt::ReplaceClip ...) ( const QRectF &rectangle , Qt::ClipOperation operation=Qt::ReplaceClip )

    Enables clipping, and sets the clip region to the given rectangle using the given clip operation. The default operation is to replace the current clip rectangle.

    Note that the clip rectangle is specified in logical (painter) coordinates.

    See also clipRegion(), setClipping(), and Clipping.

    Look up this member in the source code.

    Toggle details void QPainter

    setClipRectsetClipRect ( int x , int y , int width , int height , Qt::ClipOperation operation=Qt::ReplaceClip ...) ( int x , int y , int width , int height , Qt::ClipOperation operation=Qt::ReplaceClip )

    Enables clipping, and sets the clip region to the rectangle beginning at (x, y) with the given width and height.

    Look up this member in the source code.

    Toggle details void QPainter

    setClipRectsetClipRect ( const QRect &rectangle , Qt::ClipOperation operation=Qt::ReplaceClip ...) ( const QRect &rectangle , Qt::ClipOperation operation=Qt::ReplaceClip )

    This is an overloaded function.

    Enables clipping, and sets the clip region to the given rectangle using the given clip operation.

    Look up this member in the source code.

    Toggle details void QPainter

    setClipRegionsetClipRegion ( const QRegion &region , Qt::ClipOperation operation=Qt::ReplaceClip ...) ( const QRegion &region , Qt::ClipOperation operation=Qt::ReplaceClip )

    Sets the clip region to the given region using the specified clip operation. The default clip operation is to replace the current clip region.

    Note that the clip region is given in logical coordinates.

    See also clipRegion(), setClipRect(), and Clipping.

    Look up this member in the source code.

    Toggle details void QPainter

    setClippingsetClipping ( bool enable ) ( bool enable )

    Enables clipping if enable is true, or disables clipping if enable is false.

    See also hasClipping() and Clipping.

    Look up this member in the source code.

    Toggle details void QPainter

    setCompositionModesetCompositionMode ( CompositionMode mode ) ( CompositionMode mode )

    Sets the composition mode to the given mode.

    Warning: Only a QPainter operating on a QImage fully supports all composition modes. The RasterOp modes are supported for X11 as described in compositionMode().

    See also compositionMode().

    Look up this member in the source code.

    Toggle details void QPainter

    setFontsetFont ( const QFont &font ) ( const QFont &font )

    Sets the painter's font to the given font.

    This font is used by subsequent drawText() functions. The text color is the same as the pen color.

    If you set a font that isn't available, Qt finds a close match. font() will return what you set using setFont() and fontInfo() returns the font actually being used (which may be the same).

    See also font(), drawText(), and Settings.

    Look up this member in the source code.

    Toggle details void QPainter

    setLayoutDirectionsetLayoutDirection ( Qt::LayoutDirection direction ...) ( Qt::LayoutDirection direction )

    Sets the layout direction used by the painter when drawing text, to the specified direction.

    The default is Qt::LayoutDirectionAuto, which will implicitly determine the direction from the text drawn.

    See also QTextOption::setTextDirection(), layoutDirection(), drawText(), and Settings.

    Look up this member in the source code.

    Toggle details void QPainter

    setOpacitysetOpacity ( qreal opacity ) ( qreal opacity )

    Sets the opacity of the painter to opacity. The value should be in the range 0.0 to 1.0, where 0.0 is fully transparent and 1.0 is fully opaque.

    Opacity set on the painter will apply to all drawing operations individually.

    See also opacity().

    Look up this member in the source code.

    Toggle details void QPainter

    setPensetPen ( const QPen &pen ) ( const QPen &pen )

    Sets the painter's pen to be the given pen.

    The pen defines how to draw lines and outlines, and it also defines the text color.

    See also pen() and Settings.

    Look up this member in the source code.

    Toggle details void QPainter

    setPensetPen ( const QColor &color ) ( const QColor &color )

    This is an overloaded function.

    Sets the painter's pen to have style Qt::SolidLine, width 0 and the specified color.

    Look up this member in the source code.

    Toggle details void QPainter

    setPensetPen ( Qt::PenStyle style ) ( Qt::PenStyle style )

    This is an overloaded function.

    Sets the painter's pen to have the given style, width 0 and black color.

    Look up this member in the source code.

    Toggle details void QPainter

    setRenderHintsetRenderHint ( RenderHint hint , bool on=true ...) ( RenderHint hint , bool on=true )

    Sets the given render hint on the painter if on is true; otherwise clears the render hint.

    See also setRenderHints(), renderHints(), and Rendering Quality.

    Look up this member in the source code.

    Toggle details void QPainter

    setRenderHintssetRenderHints ( RenderHints hints , bool on=true ...) ( RenderHints hints , bool on=true )

    Sets the given render hints on the painter if on is true; otherwise clears the render hints.

    See also setRenderHint(), renderHints(), and Rendering Quality.

    Look up this member in the source code.

    Toggle details void QPainter

    setTransformsetTransform ( const QTransform &transform , bool combine=false ...) ( const QTransform &transform , bool combine=false )

    Sets the world transformation matrix. If combine is true, the specified transform is combined with the current matrix; otherwise it replaces the current matrix.

    See also transform() and setWorldTransform().

    Look up this member in the source code.

    Toggle details void QPainter

    setViewTransformEnabledsetViewTransformEnabled ( bool enable ) ( bool enable )

    Enables view transformations if enable is true, or disables view transformations if enable is false.

    See also viewTransformEnabled() and Window-Viewport Conversion.

    Look up this member in the source code.

    Toggle details void QPainter

    setViewportsetViewport ( const QRect &rectangle ) ( const QRect &rectangle )

    Sets the painter's viewport rectangle to the given rectangle, and enables view transformations.

    The viewport rectangle is part of the view transformation. The viewport specifies the device coordinate system. Its sister, the window(), specifies the logical coordinate system.

    The default viewport rectangle is the same as the device's rectangle.

    See also viewport(), viewTransformEnabled(), and Window-Viewport Conversion.

    Look up this member in the source code.

    Toggle details void QPainter

    setViewportsetViewport ( int x , int y , int width , int height ...) ( int x , int y , int width , int height )

    This is an overloaded function.

    Sets the painter's viewport rectangle to be the rectangle beginning at (x, y) with the given width and height.

    Look up this member in the source code.

    Toggle details void QPainter

    setWindowsetWindow ( const QRect &rectangle ) ( const QRect &rectangle )

    Sets the painter's window to the given rectangle, and enables view transformations.

    The window rectangle is part of the view transformation. The window specifies the logical coordinate system. Its sister, the viewport(), specifies the device coordinate system.

    The default window rectangle is the same as the device's rectangle.

    See also window(), viewTransformEnabled(), and Window-Viewport Conversion.

    Look up this member in the source code.

    Toggle details void QPainter

    setWindowsetWindow ( int x , int y , int width , int height ...) ( int x , int y , int width , int height )

    This is an overloaded function.

    Sets the painter's window to the rectangle beginning at (x, y) and the given width and height.

    Look up this member in the source code.

    Toggle details void QPainter

    setWorldMatrixEnabledsetWorldMatrixEnabled ( bool enable ) ( bool enable )

    Enables transformations if enable is true, or disables transformations if enable is false. The world transformation matrix is not changed.

    See also worldMatrixEnabled(), worldTransform(), and Coordinate Transformations.

    Look up this member in the source code.

    Toggle details void QPainter

    setWorldTransformsetWorldTransform ( const QTransform &matrix , bool combine=false ...) ( const QTransform &matrix , bool combine=false )

    Sets the world transformation matrix. If combine is true, the specified matrix is combined with the current matrix; otherwise it replaces the current matrix.

    See also worldTransform(), transform(), and setTransform().

    Look up this member in the source code.

    Toggle details void QPainter

    shearshear ( qreal sh , qreal sv ) ( qreal sh , qreal sv )

    Shears the coordinate system by (sh, sv).

    See also setWorldTransform() and Coordinate Transformations.

    Look up this member in the source code.

    Toggle details void QPainter

    strokePathstrokePath ( const QPainterPath &path , const QPen &pen ...) ( const QPainterPath &path , const QPen &pen )

    Draws the outline (strokes) the path path with the pen specified by pen

    See also fillPath() and Drawing.

    Look up this member in the source code.

    Toggle details bool QPainter

    testRenderHinttestRenderHint ( RenderHint hint ) ( RenderHint hint )const

    Returns true if hint is set; otherwise returns false.

    See also renderHints() and setRenderHint().

    Look up this member in the source code.

    Toggle details const QTransform & QPainter

    transformtransform () ()const

    Returns the world transformation matrix.

    See also setTransform() and worldTransform().

    Look up this member in the source code.

    Toggle details void QPainter

    translatetranslate ( const QPointF &offset ) ( const QPointF &offset )

    Translates the coordinate system by the given offset; i.e. the given offset is added to points.

    See also setWorldTransform() and Coordinate Transformations.

    Look up this member in the source code.

    Toggle details void QPainter

    translatetranslate ( const QPoint &offset ) ( const QPoint &offset )

    This is an overloaded function.

    Translates the coordinate system by the given offset.

    Look up this member in the source code.

    Toggle details void QPainter

    translatetranslate ( qreal dx , qreal dy ) ( qreal dx , qreal dy )

    This is an overloaded function.

    Translates the coordinate system by the vector (dx, dy).

    Look up this member in the source code.

    Toggle details bool QPainter

    viewTransformEnabledviewTransformEnabled () ()const

    Returns true if view transformation is enabled; otherwise returns false.

    See also setViewTransformEnabled() and worldTransform().

    Look up this member in the source code.

    Toggle details QRect QPainter

    viewportviewport () ()const

    Returns the viewport rectangle.

    See also setViewport() and setViewTransformEnabled().

    Look up this member in the source code.

    Toggle details QRect QPainter

    windowwindow () ()const

    Returns the window rectangle.

    See also setWindow() and setViewTransformEnabled().

    Look up this member in the source code.

    Toggle details bool QPainter

    worldMatrixEnabledworldMatrixEnabled () ()const

    Returns true if world transformation is enabled; otherwise returns false.

    See also setWorldMatrixEnabled(), worldTransform(), and Coordinate System.

    Look up this member in the source code.

    Toggle details const QTransform & QPainter

    worldTransformworldTransform () ()const

    Returns the world transformation matrix.

    See also setWorldTransform().

    Look up this member in the source code.

    Toggle details QMatrix QPainter

    combinedMatrixcombinedMatrix () ()const Obsolete function

    Returns the transformation matrix combining the current window/viewport and world transformation.

    It is advisable to use combinedTransform() instead of this function to preserve the properties of perspective transformations.

    See also setWorldTransform(), setWindow(), and setViewport().

    Look up this member in the source code.

    Toggle details const QMatrix & QPainter

    deviceMatrixdeviceMatrix () ()const Obsolete function

    Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.

    Note: It is advisable to use deviceTransform() instead of this function to preserve the properties of perspective transformations.

    This function is only needed when using platform painting commands on the platform dependent handle (Qt::HANDLE), and the platform does not do transformations nativly.

    The QPaintEngine::PaintEngineFeature enum can be queried to determine whether the platform performs the transformations or not.

    See also worldMatrix() and QPaintEngine::hasFeature().

    Look up this member in the source code.

    Toggle details void QPainter

    drawRoundRectdrawRoundRect ( const QRectF &r , int xRnd=25 , int yRnd=25 ...) ( const QRectF &r , int xRnd=25 , int yRnd=25 ) Obsolete function

    Draws a rectangle r with rounded corners.

    The xRnd and yRnd arguments specify how rounded the corners should be. 0 is angled corners, 99 is maximum roundedness.

    A filled rectangle has a size of r.size(). A stroked rectangle has a size of r.size() plus the pen width.

    See also drawRoundedRect().

    Look up this member in the source code.

    Toggle details void QPainter

    drawRoundRectdrawRoundRect ( const QRect &r , int xRnd=25 , int yRnd=25 ...) ( const QRect &r , int xRnd=25 , int yRnd=25 ) Obsolete function

    This is an overloaded function.

    Draws the rectangle r with rounded corners.

    Look up this member in the source code.

    Toggle details void QPainter

    drawRoundRectdrawRoundRect ( int x , int y , int w , int h , int xRnd=25 , int yRnd=25 ...) ( int x , int y , int w , int h , int xRnd=25 , int yRnd=25 ) Obsolete function

    This is an overloaded function.

    Draws the rectangle x, y, w, h with rounded corners.

    Look up this member in the source code.

    Toggle details const QMatrix & QPainter

    matrixmatrix () ()const Obsolete function

    Use worldTransform() instead.

    See also setMatrix() and worldTransform().

    Look up this member in the source code.

    Toggle details bool QPainter

    matrixEnabledmatrixEnabled () ()const Obsolete function

    Use worldMatrixEnabled() instead

    See also setMatrixEnabled() and worldMatrixEnabled().

    Look up this member in the source code.

    Toggle details QPaintDevice * QPainter

    redirectedredirected ( const QPaintDevice *device , QPoint *offset=0 ...) ( const QPaintDevice *device , QPoint *offset=0 ) [static] Obsolete function

    Using QWidget::render() obsoletes the use of this function.

    Returns the replacement for given device. The optional out parameter offset returns the offset within the replaced device.

    Warning: Making use of redirections in the QPainter API implies that QPainter::begin() and QPaintDevice destructors need to hold a mutex for a short period. This can impact performance. Use of QWidget::render is strongly encouraged.

    See also setRedirected() and restoreRedirected().

    Look up this member in the source code.

    Toggle details void QPainter

    resetMatrixresetMatrix () () Obsolete function

    Resets any transformations that were made using translate(), scale(), shear(), rotate(), setWorldMatrix(), setViewport() and setWindow().

    It is advisable to use resetTransform() instead of this function to preserve the properties of perspective transformations.

    See also Coordinate Transformations.

    Look up this member in the source code.

    Toggle details void QPainter

    restoreRedirectedrestoreRedirected ( const QPaintDevice *device ( const QPaintDevice *device ) [static] Obsolete function

    Using QWidget::render() obsoletes the use of this function.

    Restores the previous redirection for the given device after a call to setRedirected().

    Warning: Making use of redirections in the QPainter API implies that QPainter::begin() and QPaintDevice destructors need to hold a mutex for a short period. This can impact performance. Use of QWidget::render is strongly encouraged.

    See also redirected().

    Look up this member in the source code.

    Toggle details void QPainter

    setMatrixsetMatrix ( const QMatrix &matrix , bool combine=false ...) ( const QMatrix &matrix , bool combine=false ) Obsolete function

    Use setWorldTransform() instead.

    See also matrix() and setWorldTransform().

    Look up this member in the source code.

    Toggle details void QPainter

    setMatrixEnabledsetMatrixEnabled ( bool enable ) ( bool enable ) Obsolete function

    Use setWorldMatrixEnabled() instead.

    See also matrixEnabled() and setWorldMatrixEnabled().

    Look up this member in the source code.

    Toggle details void QPainter

    setRedirectedsetRedirected ( const QPaintDevice *device , QPaintDevice *replacement , const QPoint &offset=QPoint() ...) ( const QPaintDevice *device , QPaintDevice *replacement , const QPoint &offset=QPoint() ) [static] Obsolete function

    Please use QWidget::render() instead.

    Redirects all paint commands for the given paint device, to the replacement device. The optional point offset defines an offset within the source device.

    The redirection will not be effective until the begin() function has been called; make sure to call end() for the given device's painter (if any) before redirecting. Call restoreRedirected() to restore the previous redirection.

    Warning: Making use of redirections in the QPainter API implies that QPainter::begin() and QPaintDevice destructors need to hold a mutex for a short period. This can impact performance. Use of QWidget::render is strongly encouraged.

    See also redirected() and restoreRedirected().

    Look up this member in the source code.

    Toggle details void QPainter

    setWorldMatrixsetWorldMatrix ( const QMatrix &matrix , bool combine=false ...) ( const QMatrix &matrix , bool combine=false ) Obsolete function

    Sets the transformation matrix to matrix and enables transformations.

    Note: It is advisable to use setWorldTransform() instead of this function to preserve the properties of perspective transformations.

    If combine is true, then matrix is combined with the current transformation matrix; otherwise matrix replaces the current transformation matrix.

    If matrix is the identity matrix and combine is false, this function calls setWorldMatrixEnabled(false). (The identity matrix is the matrix where QMatrix::m11() and QMatrix::m22() are 1.0 and the rest are 0.0.)

    The following functions can transform the coordinate system without using a QMatrix:

    They operate on the painter's worldMatrix() and are implemented like this:

    1. void QPainter::rotate(qreal angle)
    2.  {
    3.     QMatrix matrix;
    4.     matrix.rotate(angle);
    5.     setWorldMatrix(matrix, true);
    6. }

    Note that when using setWorldMatrix() function you should always have combine be true when you are drawing into a QPicture. Otherwise it may not be possible to replay the picture with additional transformations; using the translate(), scale(), etc. convenience functions is safe.

    For more information about the coordinate system, transformations and window-viewport conversion, see Coordinate System.

    See also worldMatrix(), setWorldTransform(), and QTransform.

    Look up this member in the source code.

    Toggle details const QMatrix & QPainter

    worldMatrixworldMatrix () ()const Obsolete function

    Returns the world transformation matrix.

    It is advisable to use worldTransform() because worldMatrix() does not preserve the properties of perspective transformations.

    See also setWorldMatrix(), Coordinate Transformations, and Coordinate System.

    Look up this member in the source code.

    Toggle details const QColor & QPainter

    backgroundColorbackgroundColor () ()const Qt3-support

    Use background() and QBrush::color() instead.

    For example, if you have code like

    1. QColor myColor = backgroundColor();

    you can rewrite it as

    1.                     QColor myColor = background().color();

    Note that the background can be a complex brush such as a texture or a gradient.

    See also setBackgroundColor().

    Look up this member in the source code.

    Toggle details bool QPainter

    beginbegin ( QPaintDevice *device , const QWidget *init ...) ( QPaintDevice *device , const QWidget *init ) Qt3-support

    Use begin() instead.

    If the paint device is a QWidget, QPainter is initialized after the widget's settings automatically. Otherwise, you must call the initFrom() function to initialize the painters pen, background and font to the same as any given widget.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.begin(device, init);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. painter.begin(device);
    3. painter.initFrom(init);

    Look up this member in the source code.

    Toggle details QRect QPainter

    boundingRectboundingRect ( const QRect &rectangle , int flags , const QString &text , int length ...) ( const QRect &rectangle , int flags , const QString &text , int length ) Qt3-support

    Returns the bounding rectangle for the given length of the text constrained by the provided rectangle.

    Use boundingRect() combined with QString::left() instead.

    For example, if you have code like

    1. QRect rectangle = boundingRect(rect, flags, text, length);

    you can rewrite it as

    1.                     QRect rectangle = boundingRect(rect, flags, text.left(length));

    Look up this member in the source code.

    Toggle details QRect QPainter

    boundingRectboundingRect ( int x , int y , int width , int height , int flags , const QString &text , int length ...) ( int x , int y , int width , int height , int flags , const QString &text , int length ) Qt3-support

    Returns the bounding rectangle for the given length of the text constrained by the rectangle that begins at point (x, y) with the given width and height.

    Use boundingRect() combined with QString::left() instead.

    For example, if you have code like

    1. QRect rectangle = boundingRect(x, y, width, height, flags, text, length);

    you can rewrite it as

    1.                     QRect rectangle = boundingRect(x, y, width, height, flags, text.left(length));

    Look up this member in the source code.

    Toggle details void QPainter

    drawConvexPolygondrawConvexPolygon ( const QPolygonF &polygon , int index , int count=-1 ...) ( const QPolygonF &polygon , int index , int count=-1 ) Qt3-support

    This is an overloaded function.

    Use drawConvexPolygon() combined with QPolygonF::constData() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawConvexPolygon(polygon, index, count);

    you can rewrite it as

    1. int pointCount = (count == -1) ?  polygon.size() - index : count;
    2.  
    3. QPainter painter(this);
    4. painter.drawConvexPolygon(polygon.constData() + index, pointCount);

    Look up this member in the source code.

    Toggle details void QPainter

    drawConvexPolygondrawConvexPolygon ( const QPolygon &polygon , int index , int count=-1 ...) ( const QPolygon &polygon , int index , int count=-1 ) Qt3-support

    This is an overloaded function.

    Use drawConvexPolygon() combined with QPolygon::constData() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawConvexPolygon(polygon, index, count);

    you can rewrite it as

    1. int pointCount = (count == -1) ?  polygon.size() - index : count;
    2.  
    3. QPainter painter(this);
    4. painter.drawConvexPolygon(polygon.constData() + index, pointCount);

    Look up this member in the source code.

    Toggle details void QPainter

    drawCubicBezierdrawCubicBezier ( const QPolygon &controlPoints , int index=0 ...) ( const QPolygon &controlPoints , int index=0 ) Qt3-support

    Draws a cubic Bezier curve defined by the controlPoints, starting at controlPoints [index] (index defaults to 0). Points after controlPoints [index + 3] are ignored. Nothing happens if there aren't enough control points.

    Use strokePath() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawCubicBezier(controlPoints, index)

    you can rewrite it as

    1.                     QPainterPath path;
    2. path.moveTo(controlPoints.at(index));
    3. path.cubicTo(controlPoints.at(index+1),
    4.                     controlPoints.at(index+2),
    5.                     controlPoints.at(index+3));
    6.  
    7. QPainter painter(this);
    8. painter.strokePath(path, painter.pen());

    Look up this member in the source code.

    Toggle details void QPainter

    drawLineSegmentsdrawLineSegments ( const QPolygon &polygon , int index=0 , int count=-1 ...) ( const QPolygon &polygon , int index=0 , int count=-1 ) Qt3-support

    Draws count separate lines from points defined by the polygon, starting at polygon [index] (index defaults to 0). If count is -1 (the default) all points until the end of the array are used.

    Use drawLines() combined with QPolygon::constData() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawLineSegments(polygon, index, count);

    you can rewrite it as

    1. int lineCount = (count == -1) ?  (polygon.size() - index) / 2  : count;
    2.  
    3. QPainter painter(this);
    4. painter.drawLines(polygon.constData() + index * 2, lineCount);

    Look up this member in the source code.

    Toggle details void QPainter

    drawPointsdrawPoints ( const QPolygon &polygon , int index , int count=-1 ...) ( const QPolygon &polygon , int index , int count=-1 ) Qt3-support

    This is an overloaded function.

    Draws count points in the vector polygon starting on index using the current pen.

    Use drawPoints() combined with QPolygon::constData() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawPoints(polygon, index, count);

    you can rewrite it as

    1. int pointCount = (count == -1) ?  polygon.size() - index : count;
    2.  
    3. QPainter painter(this);
    4. painter.drawPoints(polygon.constData() + index, pointCount);

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolygondrawPolygon ( const QPolygonF &polygon , bool winding , int index=0 , int count=-1 ...) ( const QPolygonF &polygon , bool winding , int index=0 , int count=-1 ) Qt3-support

    This is an overloaded function.

    Use drawPolygon() combined with QPolygonF::constData() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawPolygon(polygon, winding, index, count);

    you can rewrite it as

    1. int pointCount = (count == -1) ?  polygon.size() - index : count;
    2. int fillRule = winding ? Qt::WindingFill : Qt::OddEvenFill;
    3.  
    4. QPainter painter(this);
    5. painter.drawPolygon( polygon.constData() + index, pointCount, fillRule);

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolygondrawPolygon ( const QPolygon &polygon , bool winding , int index=0 , int count=-1 ...) ( const QPolygon &polygon , bool winding , int index=0 , int count=-1 ) Qt3-support

    This is an overloaded function.

    Use drawPolygon() combined with QPolygon::constData() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawPolygon(polygon, winding, index, count);

    you can rewrite it as

    1. int pointCount = (count == -1) ?  polygon.size() - index : count;
    2. int fillRule = winding ? Qt::WindingFill : Qt::OddEvenFill;
    3.  
    4. QPainter painter(this);
    5. painter.drawPolygon( polygon.constData() + index, pointCount, fillRule);

    Look up this member in the source code.

    Toggle details void QPainter

    drawPolylinedrawPolyline ( const QPolygon &polygon , int index , int count=-1 ...) ( const QPolygon &polygon , int index , int count=-1 ) Qt3-support

    This is an overloaded function.

    Draws the polyline defined by the count lines of the given polygon starting at index (index defaults to 0).

    Use drawPolyline() combined with QPolygon::constData() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawPolyline(polygon, index, count);

    you can rewrite it as

    1. int pointCount = (count == -1) ?  polygon.size() - index : count;
    2.  
    3. QPainter painter(this);
    4. painter.drawPolyline(polygon.constData() + index, pointCount);

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( int x , int y , const QString &text , int pos , int length ...) ( int x , int y , const QString &text , int pos , int length ) Qt3-support

    Use drawText() combined with QString::mid() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawText(x, y, text, pos, length);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. painter.drawText(x, y, text.mid(pos, length));

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( const QPoint &point , const QString &text , int pos , int length ...) ( const QPoint &point , const QString &text , int pos , int length ) Qt3-support

    Use drawText() combined with QString::mid() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawText(point, text, pos, length);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. painter.drawText(point, text.mid(pos, length));

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( int x , int y , const QString &text , int length ...) ( int x , int y , const QString &text , int length ) Qt3-support

    Use drawText() combined with QString::left() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawText(x, y, text, length);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. painter.drawText(x, y, text.left(length));

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( const QPoint &point , const QString &text , int length ...) ( const QPoint &point , const QString &text , int length ) Qt3-support

    Use drawText() combined with QString::left() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawText(point, text, length);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. painter.drawText(point, text.left(length));

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( const QRect &rectangle , int flags , const QString &text , int length , QRect *br=0 ...) ( const QRect &rectangle , int flags , const QString &text , int length , QRect *br=0 ) Qt3-support

    Use drawText() combined with QString::left() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawText(rectangle, flags, text, length, br );

    you can rewrite it as

    1.                     QPainter painter(this);
    2. painter.drawText(rectangle, flags, text.left(length), br );

    Look up this member in the source code.

    Toggle details void QPainter

    drawTextdrawText ( int x , int y , int width , int height , int flags , const QString &text , int length , QRect *br=0 ...) ( int x , int y , int width , int height , int flags , const QString &text , int length , QRect *br=0 ) Qt3-support

    Use drawText() combined with QString::left() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. painter.drawText(x, y, width, height, flags, text, length, br );

    you can rewrite it as

    1.                     QPainter painter(this);
    2. painter.drawText(x, y, width, height, flags, text.left(length), br );

    Look up this member in the source code.

    Toggle details bool QPainter

    hasViewXFormhasViewXForm () ()const Qt3-support

    Use viewTransformEnabled() instead.

    Look up this member in the source code.

    Toggle details bool QPainter

    hasWorldXFormhasWorldXForm () ()const Qt3-support

    Use worldMatrixEnabled() instead.

    Look up this member in the source code.

    Toggle details void QPainter

    redirectredirect ( QPaintDevice *pdev , QPaintDevice *replacement ...) ( QPaintDevice *pdev , QPaintDevice *replacement ) [static] Qt3-support

    Use setRedirected() instead.

    Look up this member in the source code.

    Toggle details QPaintDevice * QPainter

    redirectredirect ( QPaintDevice *pdev ) ( QPaintDevice *pdev ) [static] Qt3-support

    Use redirected() instead.

    Look up this member in the source code.

    Toggle details void QPainter

    resetXFormresetXForm () () Qt3-support

    Use resetTransform() instead.

    Look up this member in the source code.

    Toggle details void QPainter

    setBackgroundColorsetBackgroundColor ( const QColor &color ) ( const QColor &color ) Qt3-support

    Use setBackground() instead.

    See also backgroundColor().

    Look up this member in the source code.

    Toggle details void QPainter

    setViewXFormsetViewXForm ( bool enabled ) ( bool enabled ) Qt3-support

    Use setViewTransformEnabled() instead.

    See also hasViewXForm().

    Look up this member in the source code.

    Toggle details void QPainter

    setWorldXFormsetWorldXForm ( bool enabled ) ( bool enabled ) Qt3-support

    Use setWorldMatrixEnabled() instead.

    See also hasWorldXForm().

    Look up this member in the source code.

    Toggle details qreal QPainter

    translationXtranslationX () ()const Qt3-support

    Use the worldTransform() combined with QTransform::dx() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. qreal x = painter.translationX();

    you can rewrite it as

    1.                     QPainter painter(this);
    2. qreal x = painter.worldTransform().dx();

    Look up this member in the source code.

    Toggle details qreal QPainter

    translationYtranslationY () ()const Qt3-support

    Use the worldTransform() combined with QTransform::dy() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. qreal y = painter.translationY();

    you can rewrite it as

    1.                     QPainter painter(this);
    2. qreal y = painter.worldTransform().dy();

    Look up this member in the source code.

    Toggle details QPoint QPainter

    xFormxForm ( const QPoint &point ) ( const QPoint &point )const Qt3-support

    Use combinedTransform() instead.

    Look up this member in the source code.

    Toggle details QRect QPainter

    xFormxForm ( const QRect &rectangle ) ( const QRect &rectangle )const Qt3-support

    This is an overloaded function.

    Use combinedTransform() instead of this function and call mapRect() on the result to obtain a QRect.

    Look up this member in the source code.

    Toggle details QPolygon QPainter

    xFormxForm ( const QPolygon &polygon ) ( const QPolygon &polygon )const Qt3-support

    This is an overloaded function.

    Use combinedTransform() instead.

    Look up this member in the source code.

    Toggle details QPolygon QPainter

    xFormxForm ( const QPolygon &polygon , int index , int count ...) ( const QPolygon &polygon , int index , int count )const Qt3-support

    This is an overloaded function.

    Use combinedTransform() combined with QPolygon::mid() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. QPolygon transformed = painter.xForm(polygon, index, count)

    you can rewrite it as

    1.                     QPainter painter(this);
    2. QPolygon transformed = polygon.mid(index, count) * painter.combinedTransform();

    Look up this member in the source code.

    Toggle details QPoint QPainter

    xFormDevxFormDev ( const QPoint &point ) ( const QPoint &point )const Qt3-support

    This is an overloaded function.

    Use combinedTransform() combined with QTransform::inverted() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. QPoint transformed = painter.xFormDev(point);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. QPoint transformed = point * painter.combinedTransform().inverted();

    Look up this member in the source code.

    Toggle details QRect QPainter

    xFormDevxFormDev ( const QRect &rectangle ) ( const QRect &rectangle )const Qt3-support

    This is an overloaded function.

    Use combinedTransform() combined with QTransform::inverted() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. QRect transformed = painter.xFormDev(rectangle);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. QRegion region = QRegion(rectangle) * painter.combinedTransform().inverted();
    3. QRect transformed = region.boundingRect();

    Look up this member in the source code.

    Toggle details QPolygon QPainter

    xFormDevxFormDev ( const QPolygon &polygon ) ( const QPolygon &polygon )const Qt3-support

    This is an overloaded function.

    Use combinedTransform() combined with QTransform::inverted() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. QPolygon transformed = painter.xFormDev(rectangle);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. QPolygon transformed = polygon * painter.combinedTransform().inverted();

    Look up this member in the source code.

    Toggle details QPolygon QPainter

    xFormDevxFormDev ( const QPolygon &polygon , int index , int count ...) ( const QPolygon &polygon , int index , int count )const Qt3-support

    This is an overloaded function.

    Use combinedTransform() combined with QPolygon::mid() and QTransform::inverted() instead.

    For example, if you have code like

    1. QPainter painter(this);
    2. QPolygon transformed = painter.xFormDev(polygon, index, count);

    you can rewrite it as

    1.                     QPainter painter(this);
    2. QPolygon transformed = polygon.mid(index, count) * painter.combinedTransform().inverted();

    Look up this member in the source code.

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