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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">lighting.cpp Example File</h1> <span class="small-subtitle">effects/lighting/lighting.cpp</span> <!-- $$$effects/lighting/lighting.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2013 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "lighting.h"</span> <span class="preprocessor">#include <QtGui></span> <span class="preprocessor">#ifndef M_PI</span> <span class="preprocessor">#define M_PI 3.14159265358979323846</span> <span class="preprocessor">#endif</span> Lighting<span class="operator">::</span>Lighting(<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> angle(<span class="number">0.0</span>) { setScene(<span class="operator">&</span>m_scene); setupScene(); <span class="type"><a href="qtimer.html">QTimer</a></span> <span class="operator">*</span>timer <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtimer.html">QTimer</a></span>(<span class="keyword">this</span>); connect(timer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> SLOT(animate())); timer<span class="operator">-</span><span class="operator">></span>setInterval(<span class="number">30</span>); timer<span class="operator">-</span><span class="operator">></span>start(); setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">true</span>); setFrameStyle(<span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>NoFrame); } <span class="type">void</span> Lighting<span class="operator">::</span>setupScene() { m_scene<span class="operator">.</span>setSceneRect(<span class="operator">-</span><span class="number">300</span><span class="operator">,</span> <span class="operator">-</span><span class="number">200</span><span class="operator">,</span> <span class="number">600</span><span class="operator">,</span> <span class="number">460</span>); <span class="type"><a href="qlineargradient.html">QLinearGradient</a></span> linearGrad(<span class="type"><a href="qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="operator">-</span><span class="number">100</span>)<span class="operator">,</span> <span class="type"><a href="qpointf.html">QPointF</a></span>(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>)); linearGrad<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">255</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">255</span>)); linearGrad<span class="operator">.</span>setColorAt(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">192</span><span class="operator">,</span> <span class="number">192</span><span class="operator">,</span> <span class="number">255</span>)); setBackgroundBrush(linearGrad); <span class="type"><a href="qradialgradient.html">QRadialGradient</a></span> radialGrad(<span class="number">30</span><span class="operator">,</span> <span class="number">30</span><span class="operator">,</span> <span class="number">30</span>); radialGrad<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>yellow); radialGrad<span class="operator">.</span>setColorAt(<span class="number">0.2</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>yellow); radialGrad<span class="operator">.</span>setColorAt(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>transparent); <span class="type"><a href="qpixmap.html">QPixmap</a></span> pixmap(<span class="number">60</span><span class="operator">,</span> <span class="number">60</span>); pixmap<span class="operator">.</span>fill(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>transparent); <span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>pixmap); painter<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen); painter<span class="operator">.</span>setBrush(radialGrad); painter<span class="operator">.</span>drawEllipse(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">60</span><span class="operator">,</span> <span class="number">60</span>); painter<span class="operator">.</span>end(); m_lightSource <span class="operator">=</span> m_scene<span class="operator">.</span>addPixmap(pixmap); m_lightSource<span class="operator">-</span><span class="operator">></span>setZValue(<span class="number">2</span>); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="operator">-</span><span class="number">2</span>; i <span class="operator"><</span> <span class="number">3</span>; <span class="operator">+</span><span class="operator">+</span>i) <span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="operator">-</span><span class="number">2</span>; j <span class="operator"><</span> <span class="number">3</span>; <span class="operator">+</span><span class="operator">+</span>j) { <span class="type"><a href="qabstractgraphicsshapeitem.html">QAbstractGraphicsShapeItem</a></span> <span class="operator">*</span>item; <span class="keyword">if</span> ((i <span class="operator">+</span> j) <span class="operator">&</span> <span class="number">1</span>) item <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsellipseitem.html">QGraphicsEllipseItem</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span>); <span class="keyword">else</span> item <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsrectitem.html">QGraphicsRectItem</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span>); item<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qpen.html">QPen</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black<span class="operator">,</span> <span class="number">1</span>)); item<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type"><a href="qbrush.html">QBrush</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white)); <span class="type"><a href="qgraphicsdropshadoweffect.html">QGraphicsDropShadowEffect</a></span> <span class="operator">*</span>effect <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsdropshadoweffect.html">QGraphicsDropShadowEffect</a></span>; effect<span class="operator">-</span><span class="operator">></span>setBlurRadius(<span class="number">8</span>); item<span class="operator">-</span><span class="operator">></span>setGraphicsEffect(effect); item<span class="operator">-</span><span class="operator">></span>setZValue(<span class="number">1</span>); item<span class="operator">-</span><span class="operator">></span>setPos(i <span class="operator">*</span> <span class="number">80</span><span class="operator">,</span> j <span class="operator">*</span> <span class="number">80</span>); m_scene<span class="operator">.</span>addItem(item); m_items <span class="operator"><</span><span class="operator"><</span> item; } } <span class="type">void</span> Lighting<span class="operator">::</span>animate() { angle <span class="operator">+</span><span class="operator">=</span> (M_PI <span class="operator">/</span> <span class="number">30</span>); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> xs <span class="operator">=</span> <span class="number">200</span> <span class="operator">*</span> sin(angle) <span class="operator">-</span> <span class="number">40</span> <span class="operator">+</span> <span class="number">25</span>; <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> ys <span class="operator">=</span> <span class="number">200</span> <span class="operator">*</span> cos(angle) <span class="operator">-</span> <span class="number">40</span> <span class="operator">+</span> <span class="number">25</span>; m_lightSource<span class="operator">-</span><span class="operator">></span>setPos(xs<span class="operator">,</span> ys); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> m_items<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> m_items<span class="operator">.</span>at(i); Q_ASSERT(item); <span class="type"><a href="qgraphicsdropshadoweffect.html">QGraphicsDropShadowEffect</a></span> <span class="operator">*</span>effect <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qgraphicsdropshadoweffect.html">QGraphicsDropShadowEffect</a></span> <span class="operator">*</span><span class="operator">></span>(item<span class="operator">-</span><span class="operator">></span>graphicsEffect()); Q_ASSERT(effect); <span class="type"><a href="qpointf.html">QPointF</a></span> delta(item<span class="operator">-</span><span class="operator">></span>x() <span class="operator">-</span> xs<span class="operator">,</span> item<span class="operator">-</span><span class="operator">></span>y() <span class="operator">-</span> ys); effect<span class="operator">-</span><span class="operator">></span>setOffset(delta<span class="operator">.</span>toPoint() <span class="operator">/</span> <span class="number">30</span>); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dx <span class="operator">=</span> delta<span class="operator">.</span>x(); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dy <span class="operator">=</span> delta<span class="operator">.</span>y(); <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> dd <span class="operator">=</span> sqrt(dx <span class="operator">*</span> dx <span class="operator">+</span> dy <span class="operator">*</span> dy); <span class="type"><a href="qcolor.html">QColor</a></span> color <span class="operator">=</span> effect<span class="operator">-</span><span class="operator">></span>color(); color<span class="operator">.</span>setAlphaF(<a href="qtglobal.html#qBound">qBound</a>(<span class="number">0.4</span><span class="operator">,</span> <span class="number">1</span> <span class="operator">-</span> dd <span class="operator">/</span> <span class="number">200.0</span><span class="operator">,</span> <span class="number">0.7</span>)); effect<span class="operator">-</span><span class="operator">></span>setColor(color); } m_scene<span class="operator">.</span>update(); } <span class="type">void</span> Lighting<span class="operator">::</span>resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span><span class="comment">/*event*/</span>) { <span class="preprocessor">#if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)</span> fitInView(sceneRect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio); <span class="preprocessor">#endif</span> }</pre> </div> <!-- @@@effects/lighting/lighting.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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