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

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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();
     }