src_corelib_tools_qpoint.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
QPoint p;
 
p.setX(p.x() + 1);
p += QPoint(1, 0);
p.rx()++;
 
 
QPoint p(1, 2);
p.rx()--;   // p becomes (0, 2)
 
 
QPoint p(1, 2);
p.ry()++;   // p becomes (1, 3)
 
 
QPoint p( 3, 7);
QPoint q(-1, 4);
p += q;    // p becomes (2, 11)
 
 
QPoint p( 3, 7);
QPoint q(-1, 4);
p -= q;    // p becomes (4, 3)
 
 
QPoint p(-1, 4);
p *= 2.5;    // p becomes (-3, 10)
 
 
QPoint p( 3, 7);
QPoint q(-1, 4);
int dotProduct = QPoint::dotProduct(p, q);   // dotProduct becomes 25
 
 
QPoint p(-3, 10);
p /= 2.5;           // p becomes (-1, 4)
 
 
QPoint oldPosition;
 
MyWidget::mouseMoveEvent(QMouseEvent *event)
{
    QPoint point = event->pos() - oldPosition;
    if (point.manhattanLength() > 3)
        // the mouse has moved more than 3 pixels since the oldPosition
}
 
 
double trueLength = std::sqrt(std::pow(x(), 2) + std::pow(y(), 2));
 
 
QPointF p;
 
p.setX(p.x() + 1.0);
p += QPointF(1.0, 0.0);
p.rx()++;
 
 
 QPointF p(1.1, 2.5);
 p.rx()--;   // p becomes (0.1, 2.5)
 
 
QPointF p(1.1, 2.5);
p.ry()++;   // p becomes (1.1, 3.5)
 
 
QPointF p( 3.1, 7.1);
QPointF q(-1.0, 4.1);
p += q;    // p becomes (2.1, 11.2)
 
 
QPointF p( 3.1, 7.1);
QPointF q(-1.0, 4.1);
p -= q;    // p becomes (4.1, 3.0)
 
 
QPointF p(-1.1, 4.1);
p *= 2.5;    // p becomes (-2.75, 10.25)
 
 
QPointF p(-2.75, 10.25);
p /= 2.5;           // p becomes (-1.1, 4.1)
 
 
QPointF p( 3.1, 7.1);
QPointF q(-1.0, 4.1);
qreal dotProduct = QPointF::dotProduct(p, q);   // dotProduct becomes 26.01