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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">tabletcanvas.cpp Example File</h1> <span class="small-subtitle">widgets/tablet/tabletcanvas.cpp</span> <!-- $$$widgets/tablet/tabletcanvas.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 <QtGui></span> <span class="preprocessor">#include <math.h></span> <span class="preprocessor">#include "tabletcanvas.h"</span> TabletCanvas<span class="operator">::</span>TabletCanvas() { resize(<span class="number">500</span><span class="operator">,</span> <span class="number">500</span>); myBrush <span class="operator">=</span> <span class="type"><a href="qbrush.html">QBrush</a></span>(); myPen <span class="operator">=</span> <span class="type"><a href="qpen.html">QPen</a></span>(); initPixmap(); setAutoFillBackground(<span class="keyword">true</span>); deviceDown <span class="operator">=</span> <span class="keyword">false</span>; myColor <span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red; myTabletDevice <span class="operator">=</span> <span class="type"><a href="qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Stylus; alphaChannelType <span class="operator">=</span> NoAlpha; colorSaturationType <span class="operator">=</span> NoSaturation; lineWidthType <span class="operator">=</span> LineWidthPressure; } <span class="type">void</span> TabletCanvas<span class="operator">::</span>initPixmap() { <span class="type"><a href="qpixmap.html">QPixmap</a></span> newPixmap <span class="operator">=</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span>(width()<span class="operator">,</span> height()); newPixmap<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> painter(<span class="operator">&</span>newPixmap); <span class="keyword">if</span> (<span class="operator">!</span>pixmap<span class="operator">.</span>isNull()) painter<span class="operator">.</span>drawPixmap(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> pixmap); painter<span class="operator">.</span>end(); pixmap <span class="operator">=</span> newPixmap; } <span class="type">bool</span> TabletCanvas<span class="operator">::</span>saveImage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>file) { <span class="keyword">return</span> pixmap<span class="operator">.</span>save(file); } <span class="type">bool</span> TabletCanvas<span class="operator">::</span>loadImage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>file) { <span class="type">bool</span> success <span class="operator">=</span> pixmap<span class="operator">.</span>load(file); <span class="keyword">if</span> (success) { update(); <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="keyword">return</span> <span class="keyword">false</span>; } <span class="type">void</span> TabletCanvas<span class="operator">::</span>tabletEvent(<span class="type"><a href="qtabletevent.html">QTabletEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>type()) { <span class="keyword">case</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>TabletPress: <span class="keyword">if</span> (<span class="operator">!</span>deviceDown) { deviceDown <span class="operator">=</span> <span class="keyword">true</span>; polyLine<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> polyLine<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> polyLine<span class="operator">[</span><span class="number">2</span><span class="operator">]</span> <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos(); } <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>TabletRelease: <span class="keyword">if</span> (deviceDown) deviceDown <span class="operator">=</span> <span class="keyword">false</span>; <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>TabletMove: polyLine<span class="operator">[</span><span class="number">2</span><span class="operator">]</span> <span class="operator">=</span> polyLine<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>; polyLine<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> polyLine<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>; polyLine<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos(); <span class="keyword">if</span> (deviceDown) { updateBrush(event); <span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>pixmap); paintPixmap(painter<span class="operator">,</span> event); } <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="keyword">break</span>; } update(); } <span class="type">void</span> TabletCanvas<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>) { <span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>); painter<span class="operator">.</span>drawPixmap(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> pixmap); } <span class="type">void</span> TabletCanvas<span class="operator">::</span>paintPixmap(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">&</span>painter<span class="operator">,</span> <span class="type"><a href="qtabletevent.html">QTabletEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="qpoint.html">QPoint</a></span> brushAdjust(<span class="number">10</span><span class="operator">,</span> <span class="number">10</span>); <span class="keyword">switch</span> (myTabletDevice) { <span class="keyword">case</span> <span class="type"><a href="qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Airbrush: myBrush<span class="operator">.</span>setColor(myColor); myBrush<span class="operator">.</span>setStyle(brushPattern(event<span class="operator">-</span><span class="operator">></span>pressure())); 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(myBrush); <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> <span class="number">3</span>; <span class="operator">+</span><span class="operator">+</span>i) { painter<span class="operator">.</span>drawEllipse(<span class="type"><a href="qrect.html">QRect</a></span>(polyLine<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">-</span> brushAdjust<span class="operator">,</span> polyLine<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">+</span> brushAdjust)); } <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Puck: <span class="keyword">case</span> <span class="type"><a href="qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>FourDMouse: <span class="keyword">case</span> <span class="type"><a href="qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>RotationStylus: { <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> error(tr(<span class="string">"This input device is not supported by the example."</span>)); <span class="preprocessor">#ifndef QT_NO_STATUSTIP</span> <span class="type"><a href="qstatustipevent.html">QStatusTipEvent</a></span> status(error); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>sendEvent(<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>status); <span class="preprocessor">#else</span> <a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> error; <span class="preprocessor">#endif</span> } <span class="keyword">break</span>; <span class="keyword">default</span>: { <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> error(tr(<span class="string">"Unknown tablet device - treating as stylus"</span>)); <span class="preprocessor">#ifndef QT_NO_STATUSTIP</span> <span class="type"><a href="qstatustipevent.html">QStatusTipEvent</a></span> status(error); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>sendEvent(<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>status); <span class="preprocessor">#else</span> <a href="qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> error; <span class="preprocessor">#endif</span> } <span class="comment">// FALL-THROUGH</span> <span class="keyword">case</span> <span class="type"><a href="qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Stylus: painter<span class="operator">.</span>setBrush(myBrush); painter<span class="operator">.</span>setPen(myPen); painter<span class="operator">.</span>drawLine(polyLine<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>pos()); <span class="keyword">break</span>; } } <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>BrushStyle TabletCanvas<span class="operator">::</span>brushPattern(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> value) { <span class="type">int</span> pattern <span class="operator">=</span> <span class="type">int</span>((value) <span class="operator">*</span> <span class="number">100.0</span>) <span class="operator">%</span> <span class="number">7</span>; <span class="keyword">switch</span> (pattern) { <span class="keyword">case</span> <span class="number">0</span>: <span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>SolidPattern; <span class="keyword">case</span> <span class="number">1</span>: <span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense1Pattern; <span class="keyword">case</span> <span class="number">2</span>: <span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense2Pattern; <span class="keyword">case</span> <span class="number">3</span>: <span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense3Pattern; <span class="keyword">case</span> <span class="number">4</span>: <span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense4Pattern; <span class="keyword">case</span> <span class="number">5</span>: <span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense5Pattern; <span class="keyword">case</span> <span class="number">6</span>: <span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense6Pattern; <span class="keyword">default</span>: <span class="keyword">return</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Dense7Pattern; } } <span class="type">void</span> TabletCanvas<span class="operator">::</span>updateBrush(<span class="type"><a href="qtabletevent.html">QTabletEvent</a></span> <span class="operator">*</span>event) { <span class="type">int</span> hue<span class="operator">,</span> saturation<span class="operator">,</span> value<span class="operator">,</span> alpha; myColor<span class="operator">.</span>getHsv(<span class="operator">&</span>hue<span class="operator">,</span> <span class="operator">&</span>saturation<span class="operator">,</span> <span class="operator">&</span>value<span class="operator">,</span> <span class="operator">&</span>alpha); <span class="type">int</span> vValue <span class="operator">=</span> <span class="type">int</span>(((event<span class="operator">-</span><span class="operator">></span>yTilt() <span class="operator">+</span> <span class="number">60.0</span>) <span class="operator">/</span> <span class="number">120.0</span>) <span class="operator">*</span> <span class="number">255</span>); <span class="type">int</span> hValue <span class="operator">=</span> <span class="type">int</span>(((event<span class="operator">-</span><span class="operator">></span>xTilt() <span class="operator">+</span> <span class="number">60.0</span>) <span class="operator">/</span> <span class="number">120.0</span>) <span class="operator">*</span> <span class="number">255</span>); <span class="keyword">switch</span> (alphaChannelType) { <span class="keyword">case</span> AlphaPressure: myColor<span class="operator">.</span>setAlpha(<span class="type">int</span>(event<span class="operator">-</span><span class="operator">></span>pressure() <span class="operator">*</span> <span class="number">255.0</span>)); <span class="keyword">break</span>; <span class="keyword">case</span> AlphaTilt: myColor<span class="operator">.</span>setAlpha(maximum(abs(vValue <span class="operator">-</span> <span class="number">127</span>)<span class="operator">,</span> abs(hValue <span class="operator">-</span> <span class="number">127</span>))); <span class="keyword">break</span>; <span class="keyword">default</span>: myColor<span class="operator">.</span>setAlpha(<span class="number">255</span>); } <span class="keyword">switch</span> (colorSaturationType) { <span class="keyword">case</span> SaturationVTilt: myColor<span class="operator">.</span>setHsv(hue<span class="operator">,</span> vValue<span class="operator">,</span> value<span class="operator">,</span> alpha); <span class="keyword">break</span>; <span class="keyword">case</span> SaturationHTilt: myColor<span class="operator">.</span>setHsv(hue<span class="operator">,</span> hValue<span class="operator">,</span> value<span class="operator">,</span> alpha); <span class="keyword">break</span>; <span class="keyword">case</span> SaturationPressure: myColor<span class="operator">.</span>setHsv(hue<span class="operator">,</span> <span class="type">int</span>(event<span class="operator">-</span><span class="operator">></span>pressure() <span class="operator">*</span> <span class="number">255.0</span>)<span class="operator">,</span> value<span class="operator">,</span> alpha); <span class="keyword">break</span>; <span class="keyword">default</span>: ; } <span class="keyword">switch</span> (lineWidthType) { <span class="keyword">case</span> LineWidthPressure: myPen<span class="operator">.</span>setWidthF(event<span class="operator">-</span><span class="operator">></span>pressure() <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> <span class="number">1</span>); <span class="keyword">break</span>; <span class="keyword">case</span> LineWidthTilt: myPen<span class="operator">.</span>setWidthF(maximum(abs(vValue <span class="operator">-</span> <span class="number">127</span>)<span class="operator">,</span> abs(hValue <span class="operator">-</span> <span class="number">127</span>)) <span class="operator">/</span> <span class="number">12</span>); <span class="keyword">break</span>; <span class="keyword">default</span>: myPen<span class="operator">.</span>setWidthF(<span class="number">1</span>); } <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>pointerType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Eraser) { myBrush<span class="operator">.</span>setColor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white); myPen<span class="operator">.</span>setColor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white); myPen<span class="operator">.</span>setWidthF(event<span class="operator">-</span><span class="operator">></span>pressure() <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> <span class="number">1</span>); } <span class="keyword">else</span> { myBrush<span class="operator">.</span>setColor(myColor); myPen<span class="operator">.</span>setColor(myColor); } } <span class="type">void</span> TabletCanvas<span class="operator">::</span>resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>) { initPixmap(); polyLine<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> polyLine<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> polyLine<span class="operator">[</span><span class="number">2</span><span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(); }</pre> </div> <!-- @@@widgets/tablet/tabletcanvas.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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