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

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        ** This file is part of the documentation 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];
            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)
        {
            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();
        }