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

scribblewidget.cpp Example File
qws/mousecalibration/scribblewidget.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License versions 2.0 or 3.0 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.fsf.org/licensing/licenses/info/GPLv2.html and
 ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
 ** exception, Nokia gives you certain additional rights. These rights
 ** are described in the Nokia Qt GPL Exception version 1.3, included in
 ** the file GPL_EXCEPTION.txt in this package.
 **
 ** Qt for Windows(R) Licensees
 ** As a special exception, Nokia, as the sole copyright holder for Qt
 ** Designer, grants users of the Qt/Eclipse Integration plug-in the
 ** right for the Qt/Eclipse Integration to link to functionality
 ** provided by Qt Designer and its related libraries.
 **
 ** If you are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 **
 ****************************************************************************/

 #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;
 }


Copyright © 2008 Nokia Trademarks
Qt 4.4.3