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

        /****************************************************************************
        **
        ** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the example classes of the Qt Toolkit.
        **
        ** Licensees holding valid Qt Preview licenses may use this file in
        ** accordance with the Qt Preview License Agreement provided with the
        ** Software.
        **
        ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
        ** information about Qt Commercial License Agreements.
        **
        ** Contact info@trolltech.com if any conditions of this licensing are
        ** not clear to you.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #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;
        }