qstroker_p.h File Reference

(05fc3aef53348fb58be6308076e000825b704e58)

#include <QtGui/private/qtguiglobal_p.h>
#include "QtGui/qpainterpath.h"
#include "private/qdatabuffer_p.h"
#include "private/qnumeric_p.h"

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Classes
struct	qfixed2d
class	QStrokerOps
struct	QStrokerOps::Element
class	QStroker
class	QDashStroker

Macros
#define	qt_real_to_fixed(real)   qfixed(real)
#define	qt_fixed_to_real(fixed)   fixed
#define	QT_PATH_KAPPA   0.5522847498

Typedefs
typedef void(*	qStrokerMoveToHook) (qfixed x, qfixed y, void *data)
typedef void(*	qStrokerLineToHook) (qfixed x, qfixed y, void *data)
typedef void(*	qStrokerCubicToHook) (qfixed c1x, qfixed c1y, qfixed c2x, qfixed c2y, qfixed ex, qfixed ey, void *data)

Functions
QPointF	qt_curves_for_arc (const QRectF &rect, qreal startAngle, qreal sweepLength, QPointF *controlPoints, int *point_count)
qreal	qt_t_for_arc_angle (qreal angle)
Q_GUI_EXPORT bool	qt_scaleForTransform (const QTransform &transform, qreal *scale)

Variables
QT_BEGIN_NAMESPACE typedef qreal	qfixed

Macro Definition Documentation

qt_fixed_to_real

#define qt_fixed_to_real

(

fixed

)

fixed

Definition at line 65 of file qstroker_p.h.

Referenced by QPainterPathStroker::curveThreshold(), QStroker::joinPoints(), QPainterPathStroker::miterLimit(), QSubpathFlatIterator::next(), QDashStroker::processCurrentSubpath(), qt_ft_outline_cubic_to(), qt_ft_outline_line_to(), qt_ft_outline_move_to(), qt_path_stroke_cubic_to(), qt_path_stroke_line_to(), qt_path_stroke_move_to(), qt_stroke_side(), QStroker::setStrokeWidth(), and QPainterPathStroker::width().

QT_PATH_KAPPA

#define QT_PATH_KAPPA   0.5522847498

Definition at line 77 of file qstroker_p.h.

Referenced by QStroker::joinPoints(), qt_curves_for_arc(), qt_find_ellipse_coords(), and qt_t_for_arc_angle().

qt_real_to_fixed

#define qt_real_to_fixed

(

real

)

qfixed(real)

Definition at line 64 of file qstroker_p.h.

Referenced by QStroker::QStroker(), QStroker::joinPoints(), QSubpathFlatIterator::next(), QDashStroker::processCurrentSubpath(), qt_stroke_side(), QPainterPathStroker::setCurveThreshold(), QPainterPathStroker::setDashPattern(), QPainterPathStroker::setMiterLimit(), QStroker::setStrokeWidth(), QPainterPathStroker::setWidth(), QStrokerOps::strokeEllipse(), QStrokerOps::strokePath(), and QStrokerOps::strokePolygon().

Typedef Documentation

qStrokerCubicToHook

typedef void(* qStrokerCubicToHook) (qfixed c1x, qfixed c1y, qfixed c2x, qfixed c2y, qfixed ex, qfixed ey, void *data)

Definition at line 86 of file qstroker_p.h.

qStrokerLineToHook

typedef void(* qStrokerLineToHook) (qfixed x, qfixed y, void *data)

Definition at line 85 of file qstroker_p.h.

qStrokerMoveToHook

typedef void(* qStrokerMoveToHook) (qfixed x, qfixed y, void *data)

Definition at line 84 of file qstroker_p.h.

Function Documentation

qt_curves_for_arc()

QPointF qt_curves_for_arc	(	const QRectF &	rect,
		qreal	startAngle,
		qreal	sweepLength,
		QPointF *	curves,
		int *	point_count )

Creates a number of curves for a given arc definition. The arc is defined an arc along the ellipses that fits into rect starting at startAngle and an arc length of sweepLength.

The function has three out parameters. The return value is the starting point of the arc. The curves array represents the list of cubicTo elements up to a maximum of point_count. There are of course 3 points pr curve.

Definition at line 816 of file qstroker.cpp.

References QBezier::fromPoints(), i, j, Q_ASSERT, qFloor(), qFuzzyCompare(), qFuzzyIsNull(), qt_find_ellipse_coords(), qt_is_nan(), QT_PATH_KAPPA, qt_t_for_arc_angle(), qWarning, and rect.

Referenced by QPainterPath::addEllipse(), QPainterPath::arcTo(), QPaintEngineEx::drawEllipse(), QStroker::joinPoints(), and QStrokerOps::strokeEllipse().

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qt_scaleForTransform()

Q_GUI_EXPORT bool qt_scaleForTransform	(	const QTransform &	transform,
		qreal *	scale )

Definition at line 2148 of file qtransform.cpp.

qt_t_for_arc_angle()

qreal qt_t_for_arc_angle

(

qreal

angle

)

For a given angle in the range [0 .. 90], finds the corresponding parameter t of the prototype cubic bezier arc segment b = fromPoints(QPointF(1, 0), QPointF(1, KAPPA), QPointF(KAPPA, 1), QPointF(0, 1));

From the bezier equation: b.pointAt(t).x() = (1-t)^3 + t*(1-t)^2 + t^2*(1-t)*KAPPA b.pointAt(t).y() = t*(1-t)^2 * KAPPA + t^2*(1-t) + t^3

Third degree coefficients: b.pointAt(t).x() = at^3 + bt^2 + ct + d where a = 2-3*KAPPA, b = 3*(KAPPA-1), c = 0, d = 1

b.pointAt(t).y() = at^3 + bt^2 + ct + d where a = 3*KAPPA-2, b = 6*KAPPA+3, c = 3*KAPPA, d = 0

Newton's method to find the zero of a function: given a function f(x) and initial guess x_0 x_1 = f(x_0) / f'(x_0) x_2 = f(x_1) / f'(x_1) etc...

Definition at line 756 of file qstroker.cpp.

References d, qCos(), qDegreesToRadians(), qFuzzyCompare(), qFuzzyIsNull(), qSin(), and QT_PATH_KAPPA.

Referenced by qt_curves_for_arc(), and qt_find_ellipse_coords().

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Variable Documentation

qfixed

QT_BEGIN_NAMESPACE typedef qreal qfixed

Definition at line 63 of file qstroker_p.h.

Referenced by QStroker::joinPoints(), QDashStroker::patternForStyle(), QDashStroker::processCurrentSubpath(), and qt_stroke_side().