Home · All Classes · Main Classes · Grouped Classes · Modules · Functions

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

 /****************************************************************************
 **
 ** Copyright (C) 2006-2007 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes 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
 ** General Public Licensing requirements will be met:
 ** http://www.trolltech.com/products/qt/opensource.html
 **
 ** If you are unsure which license is appropriate for your use, please
 ** review the following information:
 ** http://www.trolltech.com/products/qt/licensing.html or contact the
 ** sales department at [email protected].
 **
 ** 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;
 }