diff options
Diffstat (limited to 'examples/widgets/tools/plugandpaint/paintarea.cpp')
| -rw-r--r-- | examples/widgets/tools/plugandpaint/paintarea.cpp | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/examples/widgets/tools/plugandpaint/paintarea.cpp b/examples/widgets/tools/plugandpaint/paintarea.cpp new file mode 100644 index 0000000000..5cae92cb31 --- /dev/null +++ b/examples/widgets/tools/plugandpaint/paintarea.cpp @@ -0,0 +1,195 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#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)); +} |