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

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;
}


Copyright © 2006 Trolltech Trademarks
Qt 4.2.0-rc1