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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <h1 class="title">svgview.cpp Example File</h1> <span class="small-subtitle">painting/svgviewer/svgview.cpp</span> <!-- $$$painting/svgviewer/svgview.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2015 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** 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 The Qt Company Ltd 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "svgview.h"</span> <span class="preprocessor">#include <QFile></span> <span class="preprocessor">#include <QWheelEvent></span> <span class="preprocessor">#include <QMouseEvent></span> <span class="preprocessor">#include <QGraphicsRectItem></span> <span class="preprocessor">#include <QGraphicsSvgItem></span> <span class="preprocessor">#include <QPaintEvent></span> <span class="preprocessor">#include <qmath.h></span> <span class="preprocessor">#ifndef QT_NO_OPENGL</span> <span class="preprocessor">#include <QGLWidget></span> <span class="preprocessor">#endif</span> SvgView<span class="operator">::</span>SvgView(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span>(parent) <span class="operator">,</span> m_renderer(Native) <span class="operator">,</span> m_svgItem(<span class="number">0</span>) <span class="operator">,</span> m_backgroundItem(<span class="number">0</span>) <span class="operator">,</span> m_outlineItem(<span class="number">0</span>) { setScene(<span class="keyword">new</span> <span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span>(<span class="keyword">this</span>)); setTransformationAnchor(AnchorUnderMouse); setDragMode(ScrollHandDrag); setViewportUpdateMode(FullViewportUpdate); <span class="comment">// Prepare background check-board pattern</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span> tilePixmap(<span class="number">64</span><span class="operator">,</span> <span class="number">64</span>); tilePixmap<span class="operator">.</span>fill(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white); <span class="type"><a href="qpainter.html">QPainter</a></span> tilePainter(<span class="operator">&</span>tilePixmap); <span class="type"><a href="qcolor.html">QColor</a></span> color(<span class="number">220</span><span class="operator">,</span> <span class="number">220</span><span class="operator">,</span> <span class="number">220</span>); tilePainter<span class="operator">.</span>fillRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> color); tilePainter<span class="operator">.</span>fillRect(<span class="number">32</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> color); tilePainter<span class="operator">.</span>end(); setBackgroundBrush(tilePixmap); } <span class="type">void</span> SvgView<span class="operator">::</span>drawBackground(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>p<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qrectf.html">QRectF</a></span> <span class="operator">&</span>) { p<span class="operator">-</span><span class="operator">></span>save(); p<span class="operator">-</span><span class="operator">></span>resetTransform(); p<span class="operator">-</span><span class="operator">></span>drawTiledPixmap(viewport()<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> backgroundBrush()<span class="operator">.</span>texture()); p<span class="operator">-</span><span class="operator">></span>restore(); } <span class="type">void</span> SvgView<span class="operator">::</span>openFile(<span class="keyword">const</span> <span class="type"><a href="qfile.html">QFile</a></span> <span class="operator">&</span>file) { <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>exists()) <span class="keyword">return</span>; <span class="type"><a href="qgraphicsscene.html">QGraphicsScene</a></span> <span class="operator">*</span>s <span class="operator">=</span> scene(); <span class="type">bool</span> drawBackground <span class="operator">=</span> (m_backgroundItem <span class="operator">?</span> m_backgroundItem<span class="operator">-</span><span class="operator">></span>isVisible() : <span class="keyword">false</span>); <span class="type">bool</span> drawOutline <span class="operator">=</span> (m_outlineItem <span class="operator">?</span> m_outlineItem<span class="operator">-</span><span class="operator">></span>isVisible() : <span class="keyword">true</span>); s<span class="operator">-</span><span class="operator">></span>clear(); resetTransform(); m_svgItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicssvgitem.html">QGraphicsSvgItem</a></span>(file<span class="operator">.</span>fileName()); m_svgItem<span class="operator">-</span><span class="operator">></span>setFlags(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemClipsToShape); m_svgItem<span class="operator">-</span><span class="operator">></span>setCacheMode(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>NoCache); m_svgItem<span class="operator">-</span><span class="operator">></span>setZValue(<span class="number">0</span>); m_backgroundItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsrectitem.html">QGraphicsRectItem</a></span>(m_svgItem<span class="operator">-</span><span class="operator">></span>boundingRect()); m_backgroundItem<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white); m_backgroundItem<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen); m_backgroundItem<span class="operator">-</span><span class="operator">></span>setVisible(drawBackground); m_backgroundItem<span class="operator">-</span><span class="operator">></span>setZValue(<span class="operator">-</span><span class="number">1</span>); m_outlineItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsrectitem.html">QGraphicsRectItem</a></span>(m_svgItem<span class="operator">-</span><span class="operator">></span>boundingRect()); <span class="type"><a href="qpen.html">QPen</a></span> outline(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>DashLine); outline<span class="operator">.</span>setCosmetic(<span class="keyword">true</span>); m_outlineItem<span class="operator">-</span><span class="operator">></span>setPen(outline); m_outlineItem<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoBrush); m_outlineItem<span class="operator">-</span><span class="operator">></span>setVisible(drawOutline); m_outlineItem<span class="operator">-</span><span class="operator">></span>setZValue(<span class="number">1</span>); s<span class="operator">-</span><span class="operator">></span>addItem(m_backgroundItem); s<span class="operator">-</span><span class="operator">></span>addItem(m_svgItem); s<span class="operator">-</span><span class="operator">></span>addItem(m_outlineItem); s<span class="operator">-</span><span class="operator">></span>setSceneRect(m_outlineItem<span class="operator">-</span><span class="operator">></span>boundingRect()<span class="operator">.</span>adjusted(<span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span>)); } <span class="type">void</span> SvgView<span class="operator">::</span>setRenderer(RendererType type) { m_renderer <span class="operator">=</span> type; <span class="keyword">if</span> (m_renderer <span class="operator">=</span><span class="operator">=</span> OpenGL) { <span class="preprocessor">#ifndef QT_NO_OPENGL</span> setViewport(<span class="keyword">new</span> <span class="type"><a href="qglwidget.html">QGLWidget</a></span>(<span class="type"><a href="qglformat.html">QGLFormat</a></span>(QGL<span class="operator">::</span>SampleBuffers))); <span class="preprocessor">#endif</span> } <span class="keyword">else</span> { setViewport(<span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>); } } <span class="type">void</span> SvgView<span class="operator">::</span>setHighQualityAntialiasing(<span class="type">bool</span> highQualityAntialiasing) { <span class="preprocessor">#ifndef QT_NO_OPENGL</span> setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>HighQualityAntialiasing<span class="operator">,</span> highQualityAntialiasing); <span class="preprocessor">#else</span> Q_UNUSED(highQualityAntialiasing); <span class="preprocessor">#endif</span> } <span class="type">void</span> SvgView<span class="operator">::</span>setViewBackground(<span class="type">bool</span> enable) { <span class="keyword">if</span> (<span class="operator">!</span>m_backgroundItem) <span class="keyword">return</span>; m_backgroundItem<span class="operator">-</span><span class="operator">></span>setVisible(enable); } <span class="type">void</span> SvgView<span class="operator">::</span>setViewOutline(<span class="type">bool</span> enable) { <span class="keyword">if</span> (<span class="operator">!</span>m_outlineItem) <span class="keyword">return</span>; m_outlineItem<span class="operator">-</span><span class="operator">></span>setVisible(enable); } <span class="type">void</span> SvgView<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (m_renderer <span class="operator">=</span><span class="operator">=</span> Image) { <span class="keyword">if</span> (m_image<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> viewport()<span class="operator">-</span><span class="operator">></span>size()) { m_image <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>(viewport()<span class="operator">-</span><span class="operator">></span>size()<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32_Premultiplied); } <span class="type"><a href="qpainter.html">QPainter</a></span> imagePainter(<span class="operator">&</span>m_image); <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>render(<span class="operator">&</span>imagePainter); imagePainter<span class="operator">.</span>end(); <span class="type"><a href="qpainter.html">QPainter</a></span> p(viewport()); p<span class="operator">.</span>drawImage(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> m_image); } <span class="keyword">else</span> { <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>paintEvent(event); } } <span class="type">void</span> SvgView<span class="operator">::</span>wheelEvent(<span class="type"><a href="qwheelevent.html">QWheelEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> factor <span class="operator">=</span> <a href="qtcore-qmath-h.html#qPow">qPow</a>(<span class="number">1.2</span><span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>delta() <span class="operator">/</span> <span class="number">240.0</span>); scale(factor<span class="operator">,</span> factor); event<span class="operator">-</span><span class="operator">></span>accept(); }</pre> </div> <!-- @@@painting/svgviewer/svgview.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd. 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