<?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>basictoolsplugin.cpp Example File | Qt Widgets 5.9</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 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-tools-plugandpaint-plugins-basictools-example.html">Plug & Paint Basic Tools Example</a></td><td >basictoolsplugin.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</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">basictoolsplugin.cpp Example File</h1> <span class="subtitle">tools/plugandpaint/plugins/basictools/basictoolsplugin.cpp</span> <!-- $$$tools/plugandpaint/plugins/basictools/basictoolsplugin.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 <QtWidgets></span> <span class="preprocessor">#include <cmath></span> <span class="preprocessor">#include <stdlib.h></span> <span class="preprocessor">#include "basictoolsplugin.h"</span> <span class="keyword">const</span> <span class="type">float</span> Pi <span class="operator">=</span> <span class="number">3.14159f</span>; <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> BasicToolsPlugin<span class="operator">::</span>brushes() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span>() <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Pencil"</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Air Brush"</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Random Letters"</span>); } <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> BasicToolsPlugin<span class="operator">::</span>mousePress(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>brush<span class="operator">,</span> <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&</span>pos) { <span class="keyword">return</span> mouseMove(brush<span class="operator">,</span> painter<span class="operator">,</span> pos<span class="operator">,</span> pos); } <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> BasicToolsPlugin<span class="operator">::</span>mouseMove(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>brush<span class="operator">,</span> <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&</span>oldPos<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&</span>newPos) { painter<span class="operator">.</span>save(); <span class="type">int</span> rad <span class="operator">=</span> painter<span class="operator">.</span>pen()<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span>; <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> boundingRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(oldPos<span class="operator">,</span> newPos)<span class="operator">.</span>normalized() <span class="operator">.</span>adjusted(<span class="operator">-</span>rad<span class="operator">,</span> <span class="operator">-</span>rad<span class="operator">,</span> <span class="operator">+</span>rad<span class="operator">,</span> <span class="operator">+</span>rad); <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> color <span class="operator">=</span> painter<span class="operator">.</span>pen()<span class="operator">.</span>color(); <span class="type">int</span> thickness <span class="operator">=</span> painter<span class="operator">.</span>pen()<span class="operator">.</span>width(); <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> transparentColor(color<span class="operator">.</span>red()<span class="operator">,</span> color<span class="operator">.</span>green()<span class="operator">,</span> color<span class="operator">.</span>blue()<span class="operator">,</span> <span class="number">0</span>); <span class="keyword">if</span> (brush <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Pencil"</span>)) { painter<span class="operator">.</span>drawLine(oldPos<span class="operator">,</span> newPos); } <span class="keyword">else</span> <span class="keyword">if</span> (brush <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Air Brush"</span>)) { <span class="type">int</span> numSteps <span class="operator">=</span> <span class="number">2</span> <span class="operator">+</span> (newPos <span class="operator">-</span> oldPos)<span class="operator">.</span>manhattanLength() <span class="operator">/</span> <span class="number">2</span>; painter<span class="operator">.</span>setBrush(<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span>(color<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Dense6Pattern)); painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoPen); <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> numSteps; <span class="operator">+</span><span class="operator">+</span>i) { <span class="type">int</span> x <span class="operator">=</span> oldPos<span class="operator">.</span>x() <span class="operator">+</span> i <span class="operator">*</span> (newPos<span class="operator">.</span>x() <span class="operator">-</span> oldPos<span class="operator">.</span>x()) <span class="operator">/</span> (numSteps <span class="operator">-</span> <span class="number">1</span>); <span class="type">int</span> y <span class="operator">=</span> oldPos<span class="operator">.</span>y() <span class="operator">+</span> i <span class="operator">*</span> (newPos<span class="operator">.</span>y() <span class="operator">-</span> oldPos<span class="operator">.</span>y()) <span class="operator">/</span> (numSteps <span class="operator">-</span> <span class="number">1</span>); painter<span class="operator">.</span>drawEllipse(x <span class="operator">-</span> (thickness <span class="operator">/</span> <span class="number">2</span>)<span class="operator">,</span> y <span class="operator">-</span> (thickness <span class="operator">/</span> <span class="number">2</span>)<span class="operator">,</span> thickness<span class="operator">,</span> thickness); } } <span class="keyword">else</span> <span class="keyword">if</span> (brush <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Random Letters"</span>)) { <span class="type"><a href="../qtcore/qchar.html">QChar</a></span> ch(<span class="char">'A'</span> <span class="operator">+</span> (qrand() <span class="operator">%</span> <span class="number">26</span>)); <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> biggerFont <span class="operator">=</span> painter<span class="operator">.</span>font(); biggerFont<span class="operator">.</span>setBold(<span class="keyword">true</span>); biggerFont<span class="operator">.</span>setPointSize(biggerFont<span class="operator">.</span>pointSize() <span class="operator">+</span> thickness); painter<span class="operator">.</span>setFont(biggerFont); painter<span class="operator">.</span>drawText(newPos<span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(ch)); <span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span> metrics(painter<span class="operator">.</span>font()); boundingRect <span class="operator">=</span> metrics<span class="operator">.</span>boundingRect(ch); boundingRect<span class="operator">.</span>translate(newPos); boundingRect<span class="operator">.</span>adjust(<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="operator">+</span><span class="number">10</span><span class="operator">,</span> <span class="operator">+</span><span class="number">10</span>); } painter<span class="operator">.</span>restore(); <span class="keyword">return</span> boundingRect; } <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> BasicToolsPlugin<span class="operator">::</span>mouseRelease(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span> <span class="comment">/* brush */</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span> <span class="comment">/* painter */</span><span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&</span> <span class="comment">/* pos */</span>) { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(<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">0</span>); } <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> BasicToolsPlugin<span class="operator">::</span>shapes() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span>() <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Circle"</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Star"</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Text..."</span>); } <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> BasicToolsPlugin<span class="operator">::</span>generateShape(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>shape<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) { <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> path; <span class="keyword">if</span> (shape <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Circle"</span>)) { path<span class="operator">.</span>addEllipse(<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> <span class="keyword">if</span> (shape <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Star"</span>)) { path<span class="operator">.</span>moveTo(<span class="number">90</span><span class="operator">,</span> <span class="number">50</span>); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator"><</span> <span class="number">5</span>; <span class="operator">+</span><span class="operator">+</span>i) { path<span class="operator">.</span>lineTo(<span class="number">50</span> <span class="operator">+</span> <span class="number">40</span> <span class="operator">*</span> std<span class="operator">::</span>cos(<span class="number">0.8</span> <span class="operator">*</span> i <span class="operator">*</span> Pi)<span class="operator">,</span> <span class="number">50</span> <span class="operator">+</span> <span class="number">40</span> <span class="operator">*</span> std<span class="operator">::</span>sin(<span class="number">0.8</span> <span class="operator">*</span> i <span class="operator">*</span> Pi)); } path<span class="operator">.</span>closeSubpath(); } <span class="keyword">else</span> <span class="keyword">if</span> (shape <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Text..."</span>)) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text <span class="operator">=</span> <span class="type"><a href="qinputdialog.html">QInputDialog</a></span><span class="operator">::</span>getText(parent<span class="operator">,</span> tr(<span class="string">"Text Shape"</span>)<span class="operator">,</span> tr(<span class="string">"Enter text:"</span>)<span class="operator">,</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span><span class="operator">::</span>Normal<span class="operator">,</span> tr(<span class="string">"Qt"</span>)); <span class="keyword">if</span> (<span class="operator">!</span>text<span class="operator">.</span>isEmpty()) { <span class="type"><a href="../qtgui/qfont.html">QFont</a></span> timesFont(<span class="string">"Times"</span><span class="operator">,</span> <span class="number">50</span>); timesFont<span class="operator">.</span>setStyleStrategy(<span class="type"><a href="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>ForceOutline); path<span class="operator">.</span>addText(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> timesFont<span class="operator">,</span> text); } } <span class="keyword">return</span> path; } <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> BasicToolsPlugin<span class="operator">::</span>filters() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span>() <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Invert Pixels"</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Swap RGB"</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Grayscale"</span>); } <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> BasicToolsPlugin<span class="operator">::</span>filterImage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>filter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> <span class="operator">&</span>image<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span> <span class="comment">/* parent */</span>) { <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> result <span class="operator">=</span> image<span class="operator">.</span>convertToFormat(<span class="type"><a href="../qtgui/qimage.html">QImage</a></span><span class="operator">::</span>Format_RGB32); <span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Invert Pixels"</span>)) { result<span class="operator">.</span>invertPixels(); } <span class="keyword">else</span> <span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Swap RGB"</span>)) { result <span class="operator">=</span> result<span class="operator">.</span>rgbSwapped(); } <span class="keyword">else</span> <span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Grayscale"</span>)) { <span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator"><</span> result<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>y) { <span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator"><</span> result<span class="operator">.</span>width(); <span class="operator">+</span><span class="operator">+</span>x) { <span class="type">int</span> pixel <span class="operator">=</span> result<span class="operator">.</span>pixel(x<span class="operator">,</span> y); <span class="type">int</span> gray <span class="operator">=</span> <a href="../qtgui/qcolor.html#qGray-1">qGray</a>(pixel); <span class="type">int</span> alpha <span class="operator">=</span> <a href="../qtgui/qcolor.html#qAlpha">qAlpha</a>(pixel); result<span class="operator">.</span>setPixel(x<span class="operator">,</span> y<span class="operator">,</span> <a href="../qtgui/qcolor.html#qRgba">qRgba</a>(gray<span class="operator">,</span> gray<span class="operator">,</span> gray<span class="operator">,</span> alpha)); } } } <span class="keyword">return</span> result; } </pre> </div> <!-- @@@tools/plugandpaint/plugins/basictools/basictoolsplugin.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 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>