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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "interfaces.h"
#include "paintarea.h"
#include <QPainter>
#include <QMouseEvent>
PaintArea::PaintArea(QWidget *parent) :
QWidget(parent),
theImage(500, 400, QImage::Format_RGB32),
color(Qt::blue),
thickness(3),
brushInterface(0),
lastPos(-1, -1)
{
setAttribute(Qt::WA_StaticContents);
setAttribute(Qt::WA_NoBackground);
theImage.fill(qRgb(255, 255, 255));
}
bool PaintArea::openImage(const QString &fileName)
{
QImage image;
if (!image.load(fileName))
return false;
setImage(image);
return true;
}
bool PaintArea::saveImage(const QString &fileName, const char *fileFormat)
{
return theImage.save(fileName, fileFormat);
}
void PaintArea::setImage(const QImage &image)
{
theImage = image.convertToFormat(QImage::Format_RGB32);
update();
updateGeometry();
}
void PaintArea::insertShape(const QPainterPath &path)
{
pendingPath = path;
#ifndef QT_NO_CURSOR
setCursor(Qt::CrossCursor);
#endif
}
void PaintArea::setBrushColor(const QColor &color)
{
this->color = color;
}
void PaintArea::setBrushWidth(int width)
{
thickness = width;
}
//! [0]
void PaintArea::setBrush(BrushInterface *brushInterface, const QString &brush)
{
this->brushInterface = brushInterface;
this->brush = brush;
}
//! [0]
QSize PaintArea::sizeHint() const
{
return theImage.size();
}
void PaintArea::paintEvent(QPaintEvent * /* event */)
{
QPainter painter(this);
painter.drawImage(QPoint(0, 0), theImage);
}
void PaintArea::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton) {
if (!pendingPath.isEmpty()) {
QPainter painter(&theImage);
setupPainter(painter);
const QRectF boundingRect = pendingPath.boundingRect();
QLinearGradient gradient(boundingRect.topRight(),
boundingRect.bottomLeft());
gradient.setColorAt(0.0, QColor(color.red(), color.green(),
color.blue(), 63));
gradient.setColorAt(1.0, QColor(color.red(), color.green(),
color.blue(), 191));
painter.setBrush(gradient);
painter.translate(event->pos() - boundingRect.center());
painter.drawPath(pendingPath);
pendingPath = QPainterPath();
#ifndef QT_NO_CURSOR
unsetCursor();
#endif
update();
} else {
if (brushInterface) {
QPainter painter(&theImage);
setupPainter(painter);
const QRect rect = brushInterface->mousePress(brush, painter,
event->pos());
update(rect);
}
lastPos = event->pos();
}
}
}
//! [1]
void PaintArea::mouseMoveEvent(QMouseEvent *event)
{
if ((event->buttons() & Qt::LeftButton) && lastPos != QPoint(-1, -1)) {
if (brushInterface) {
QPainter painter(&theImage);
setupPainter(painter);
const QRect rect = brushInterface->mouseMove(brush, painter, lastPos,
event->pos());
update(rect);
}
lastPos = event->pos();
}
}
//! [1]
void PaintArea::mouseReleaseEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton && lastPos != QPoint(-1, -1)) {
if (brushInterface) {
QPainter painter(&theImage);
setupPainter(painter);
QRect rect = brushInterface->mouseRelease(brush, painter,
event->pos());
update(rect);
}
lastPos = QPoint(-1, -1);
}
}
void PaintArea::setupPainter(QPainter &painter)
{
painter.setRenderHint(QPainter::Antialiasing, true);
painter.setPen(QPen(color, thickness, Qt::SolidLine, Qt::RoundCap,
Qt::RoundJoin));
}
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