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scribblewidget.cpp Example File
^{qtopiacore/mousecalibration/scribblewidget.cpp}

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    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
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    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
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    #include "scribblewidget.h"

    ScribbleWidget::ScribbleWidget(QWidget *parent)
        : QWidget(parent)
    {
        scribbling = false;
    }

    void ScribbleWidget::resizeEvent(QResizeEvent *e)
    {
        image = QImage(e->size(), QImage::Format_RGB32);
        image.fill(QColor(Qt::white).rgb());
    }

    void ScribbleWidget::mousePressEvent(QMouseEvent *event)
    {
        if (event->button() != Qt::LeftButton)
            return;

        lastPoint = event->pos();
        scribbling = true;
    }

    void ScribbleWidget::mouseMoveEvent(QMouseEvent *event)
    {
        if ((event->buttons() & Qt::LeftButton) && scribbling)
            drawLineTo(event->pos());
    }

    void ScribbleWidget::mouseReleaseEvent(QMouseEvent *event)
    {
        if (event->button() == Qt::LeftButton && scribbling) {
            drawLineTo(event->pos());
            scribbling = false;
        }
    }

    void ScribbleWidget::paintEvent(QPaintEvent *)
    {
        QPainter painter(this);
        painter.drawImage(QPoint(0, 0), image);
    }

    void ScribbleWidget::drawLineTo(const QPoint &endPoint)
    {
        QPainter painter(&image);
        painter.setPen(QPen(Qt::blue, 1, Qt::SolidLine,
                            Qt::RoundCap, Qt::RoundJoin));
        painter.drawLine(lastPoint, endPoint);
        update();
        lastPoint = endPoint;
    }