Qt:Документация 4.3.2/tools-plugandpaint-paintarea-cpp
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[править] paintarea.cpp Example File
tools/plugandpaint/paintarea.cpp
/**************************************************************************** ** ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 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://trolltech.com/products/qt/licenses/licensing/opensource/ ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.0, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** In addition, as a special exception, Trolltech, 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. ** ** Trolltech reserves all rights not expressly granted herein. ** ** Trolltech ASA (c) 2007 ** ** 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 "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; setCursor(Qt::CrossCursor); } void PaintArea::setBrushColor(const QColor &color) { this->color = color; } void PaintArea::setBrushWidth(int width) { thickness = width; } void PaintArea::setBrush(BrushInterface *brushInterface, const QString &brush) { this->brushInterface = brushInterface; this->brush = brush; } 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(); unsetCursor(); update(); } else { if (brushInterface) { QPainter painter(&theImage); setupPainter(painter); const QRect rect = brushInterface->mousePress(brush, painter, event->pos()); update(rect); } lastPos = event->pos(); } } } 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(); } } 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)); }
Copyright © 2007 Trolltech | Trademarks | Qt 4.3.2
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