<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>renderarea.cpp Example File | Qt Widgets 5.12.2</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-painting-transformations-example.html">Transformations Example</a></td><td >renderarea.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.2 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">renderarea.cpp Example File</h1> <span class="subtitle">painting/transformations/renderarea.cpp</span> <!-- $$$painting/transformations/renderarea.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, 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 "renderarea.h"</span> <span class="preprocessor">#include <QPainter></span> <span class="preprocessor">#include <QPaintEvent></span> RenderArea<span class="operator">::</span>RenderArea(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent) { <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> newFont <span class="operator">=</span> font(); newFont<span class="operator">.</span>setPixelSize(<span class="number">12</span>); setFont(newFont); <span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span> fontMetrics(newFont); xBoundingRect <span class="operator">=</span> fontMetrics<span class="operator">.</span>boundingRect(tr(<span class="string">"x"</span>)); yBoundingRect <span class="operator">=</span> fontMetrics<span class="operator">.</span>boundingRect(tr(<span class="string">"y"</span>)); } <span class="type">void</span> RenderArea<span class="operator">::</span>setOperations(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span>Operation<span class="operator">></span> <span class="operator">&</span>operations) { <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>operations <span class="operator">=</span> operations; update(); } <span class="type">void</span> RenderArea<span class="operator">::</span>setShape(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> <span class="operator">&</span>shape) { <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>shape <span class="operator">=</span> shape; update(); } <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> RenderArea<span class="operator">::</span>minimumSizeHint() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">182</span><span class="operator">,</span> <span class="number">182</span>); } <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> RenderArea<span class="operator">::</span>sizeHint() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">232</span><span class="operator">,</span> <span class="number">232</span>); } <span class="type">void</span> RenderArea<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>); painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing); painter<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> <span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white)); painter<span class="operator">.</span>translate(<span class="number">66</span><span class="operator">,</span> <span class="number">66</span>); painter<span class="operator">.</span>save(); transformPainter(painter); drawShape(painter); painter<span class="operator">.</span>restore(); drawOutline(painter); transformPainter(painter); drawCoordinates(painter); } <span class="type">void</span> RenderArea<span class="operator">::</span>drawCoordinates(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter) { painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red); painter<span class="operator">.</span>drawLine(<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">0</span>); painter<span class="operator">.</span>drawLine(<span class="number">48</span><span class="operator">,</span> <span class="operator">-</span><span class="number">2</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">0</span>); painter<span class="operator">.</span>drawLine(<span class="number">48</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">0</span>); painter<span class="operator">.</span>drawText(<span class="number">60</span> <span class="operator">-</span> xBoundingRect<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span> <span class="operator">+</span> xBoundingRect<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> tr(<span class="string">"x"</span>)); painter<span class="operator">.</span>drawLine(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span>); painter<span class="operator">.</span>drawLine(<span class="operator">-</span><span class="number">2</span><span class="operator">,</span> <span class="number">48</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span>); painter<span class="operator">.</span>drawLine(<span class="number">2</span><span class="operator">,</span> <span class="number">48</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">50</span>); painter<span class="operator">.</span>drawText(<span class="number">0</span> <span class="operator">-</span> yBoundingRect<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="number">60</span> <span class="operator">+</span> yBoundingRect<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> tr(<span class="string">"y"</span>)); } <span class="type">void</span> RenderArea<span class="operator">::</span>drawOutline(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter) { painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>darkGreen); painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DashLine); painter<span class="operator">.</span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoBrush); painter<span class="operator">.</span>drawRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">100</span><span class="operator">,</span> <span class="number">100</span>); } <span class="type">void</span> RenderArea<span class="operator">::</span>drawShape(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter) { painter<span class="operator">.</span>fillPath(shape<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>blue); } <span class="type">void</span> RenderArea<span class="operator">::</span>transformPainter(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter) { <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> operations<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="keyword">switch</span> (operations<span class="operator">[</span>i<span class="operator">]</span>) { <span class="keyword">case</span> Translate: painter<span class="operator">.</span>translate(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span>); <span class="keyword">break</span>; <span class="keyword">case</span> Scale: painter<span class="operator">.</span>scale(<span class="number">0.75</span><span class="operator">,</span> <span class="number">0.75</span>); <span class="keyword">break</span>; <span class="keyword">case</span> Rotate: painter<span class="operator">.</span>rotate(<span class="number">60</span>); <span class="keyword">break</span>; <span class="keyword">case</span> NoTransformation: <span class="keyword">default</span>: ; } } } </pre> </div> <!-- @@@painting/transformations/renderarea.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>