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

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        ** Copyright (C) 2006-2006 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
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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;
        }