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calibration.cpp Example File
qtopiacore/mousecalibration/calibration.cpp

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 ** This file is part of the example classes of the Qt Toolkit.
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 #include "calibration.h"

 #include <QWSPointerCalibrationData>
 #include <QPainter>
 #include <QFile>
 #include <QTimer>
 #include <QApplication>
 #include <QDesktopWidget>
 #include <QMouseEvent>
 #include <QScreen>
 #include <QWSServer>

 Calibration::Calibration()
 {
     QRect desktop = QApplication::desktop()->geometry();
     desktop.moveTo(QPoint(0, 0));
     setGeometry(desktop);

     setFocusPolicy(Qt::StrongFocus);
     setFocus();
     setModal(true);

     int width = qt_screen->deviceWidth();
     int height = qt_screen->deviceHeight();

     int dx = width / 10;
     int dy = height / 10;

     QPoint *points = data.screenPoints;
     points[QWSPointerCalibrationData::TopLeft] = QPoint(dx, dy);
     points[QWSPointerCalibrationData::BottomLeft] = QPoint(dx, height - dy);
     points[QWSPointerCalibrationData::BottomRight] = QPoint(width - dx, height - dy);
     points[QWSPointerCalibrationData::TopRight] = QPoint(width - dx, dy);
     points[QWSPointerCalibrationData::Center] = QPoint(width / 2, height / 2);

     pressCount = 0;
 }

 Calibration::~Calibration()
 {
 }

 int Calibration::exec()
 {
     QWSServer::mouseHandler()->clearCalibration();
     grabMouse();
     activateWindow();
     int ret = QDialog::exec();
     releaseMouse();
     return ret;
 }

 void Calibration::paintEvent(QPaintEvent*)
 {
     QPainter p(this);
     p.fillRect(rect(), Qt::white);

     QPoint point = data.screenPoints[pressCount];

     // Map to logical coordinates in case the screen is transformed
     QSize screenSize(qt_screen->deviceWidth(), qt_screen->deviceHeight());
     point = qt_screen->mapFromDevice(point, screenSize);

     p.fillRect(point.x() - 6, point.y() - 1, 13, 3, Qt::black);
     p.fillRect(point.x() - 1, point.y() - 6, 3, 13, Qt::black);
 }

 void Calibration::mouseReleaseEvent(QMouseEvent *event)
 {
     // Map from device coordinates in case the screen is transformed
     QSize screenSize(qt_screen->width(), qt_screen->height());
     QPoint p = qt_screen->mapToDevice(event->pos(), screenSize);

     data.devPoints[pressCount] = p;

     if (++pressCount < 5)
         repaint();
     else
         accept();
 }

 void Calibration::accept()
 {
     Q_ASSERT(pressCount == 5);
     QWSServer::mouseHandler()->calibrate(&data);
     QDialog::accept();
 }


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Qt 4.3.5