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.
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** information about Qt Commercial License Agreements.
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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;
}