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
 
#include <QPoint>
#include <QMouseEvent>
#include <iostream>
 
int x() { return 0; }
 
int y() { return 0; }
 
void examples()
{
 
    {
        //! [0]
        QPoint p;
 
        p.setX(p.x() + 1);
        p += QPoint(1, 0);
        p.rx()++;
        //! [0]
    }
 
    {
        //! [1]
        QPoint p(1, 2);
        p.rx()--;   // p becomes (0, 2)
        //! [1]
    }
 
    {
        //! [2]
        QPoint p(1, 2);
        p.ry()++;   // p becomes (1, 3)
        //! [2]
    }
 
    {
        //! [3]
        QPoint p( 3, 7);
        QPoint q(-1, 4);
        p += q;    // p becomes (2, 11)
        //! [3]
    }
 
    {
        //! [4]
        QPoint p( 3, 7);
        QPoint q(-1, 4);
        p -= q;    // p becomes (4, 3)
        //! [4]
    }
 
    {
        //! [5]
        QPoint p(-1, 4);
        p *= 2.5;    // p becomes (-3, 10)
        //! [5]
    }
 
    {
        //! [16]
        QPoint p( 3, 7);
        QPoint q(-1, 4);
        int dotProduct = QPoint::dotProduct(p, q);   // dotProduct becomes 25
        //! [16]
    }
 
    {
        //! [6]
        QPoint p(-3, 10);
        p /= 2.5;           // p becomes (-1, 4)
        //! [6]
    }
 
    {
        //! [8]
        double trueLength = std::sqrt(std::pow(x(), 2) + std::pow(y(), 2));
        //! [8]
    }
 
    {
        //! [9]
        QPointF p;
 
        p.setX(p.x() + 1.0);
        p += QPointF(1.0, 0.0);
        p.rx()++;
        //! [9]
    }
 
    {
        //! [10]
        QPointF p(1.1, 2.5);
        p.rx()--;   // p becomes (0.1, 2.5)
        //! [10]
    }
 
    {
        //! [11]
        QPointF p(1.1, 2.5);
        p.ry()++;   // p becomes (1.1, 3.5)
        //! [11]
    }
 
    {
        //! [12]
        QPointF p( 3.1, 7.1);
        QPointF q(-1.0, 4.1);
        p += q;    // p becomes (2.1, 11.2)
        //! [12]
    }
 
    {
        //! [13]
        QPointF p( 3.1, 7.1);
        QPointF q(-1.0, 4.1);
        p -= q;    // p becomes (4.1, 3.0)
        //! [13]
    }
 
    {
        //! [14]
        QPointF p(-1.1, 4.1);
        p *= 2.5;    // p becomes (-2.75, 10.25)
        //! [14]
    }
 
    {
        //! [15]
        QPointF p(-2.75, 10.25);
        p /= 2.5;           // p becomes (-1.1, 4.1)
        //! [15]
    }
 
    {
        //! [17]
        QPointF p( 3.1, 7.1);
        QPointF q(-1.0, 4.1);
        qreal dotProduct = QPointF::dotProduct(p, q);   // dotProduct becomes 26.01
        //! [17]
    }
}
 
class MyWidget
{
public:
    void mouseMoveEvent(QMouseEvent *event);
};
 
//! [7]
QPoint oldPosition;
 
void MyWidget::mouseMoveEvent(QMouseEvent *event)
{
    QPoint point = event->pos() - oldPosition;
    if (point.manhattanLength() > 3){
        // the mouse has moved more than 3 pixels since the oldPosition
    }
}
//! [7]