<?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>diagramitem.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-graphicsview-diagramscene-example.html">Diagram Scene Example</a></td><td >diagramitem.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">diagramitem.cpp Example File</h1> <span class="subtitle">graphicsview/diagramscene/diagramitem.cpp</span> <!-- $$$graphicsview/diagramscene/diagramitem.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 "diagramitem.h"</span> <span class="preprocessor">#include "arrow.h"</span> <span class="preprocessor">#include <QGraphicsScene></span> <span class="preprocessor">#include <QGraphicsSceneContextMenuEvent></span> <span class="preprocessor">#include <QMenu></span> <span class="preprocessor">#include <QPainter></span> DiagramItem<span class="operator">::</span>DiagramItem(DiagramType diagramType<span class="operator">,</span> <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>contextMenu<span class="operator">,</span> <span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qgraphicspolygonitem.html">QGraphicsPolygonItem</a></span>(parent) { myDiagramType <span class="operator">=</span> diagramType; myContextMenu <span class="operator">=</span> contextMenu; <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> path; <span class="keyword">switch</span> (myDiagramType) { <span class="keyword">case</span> StartEnd: path<span class="operator">.</span>moveTo(<span class="number">200</span><span class="operator">,</span> <span class="number">50</span>); path<span class="operator">.</span>arcTo(<span class="number">150</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="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">90</span>); path<span class="operator">.</span>arcTo(<span class="number">50</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="operator">,</span> <span class="number">90</span><span class="operator">,</span> <span class="number">90</span>); path<span class="operator">.</span>arcTo(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">180</span><span class="operator">,</span> <span class="number">90</span>); path<span class="operator">.</span>arcTo(<span class="number">150</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">270</span><span class="operator">,</span> <span class="number">90</span>); path<span class="operator">.</span>lineTo(<span class="number">200</span><span class="operator">,</span> <span class="number">25</span>); myPolygon <span class="operator">=</span> path<span class="operator">.</span>toFillPolygon(); <span class="keyword">break</span>; <span class="keyword">case</span> Conditional: myPolygon <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="number">0</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">100</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">100</span><span class="operator">,</span> <span class="number">0</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">100</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="number">0</span>); <span class="keyword">break</span>; <span class="keyword">case</span> Step: myPolygon <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/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="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></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="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">100</span><span class="operator">,</span> <span class="number">100</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">100</span><span class="operator">,</span> <span class="number">100</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/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="keyword">break</span>; <span class="keyword">default</span>: myPolygon <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">120</span><span class="operator">,</span> <span class="operator">-</span><span class="number">80</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">70</span><span class="operator">,</span> <span class="number">80</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">120</span><span class="operator">,</span> <span class="number">80</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">70</span><span class="operator">,</span> <span class="operator">-</span><span class="number">80</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="operator">-</span><span class="number">120</span><span class="operator">,</span> <span class="operator">-</span><span class="number">80</span>); <span class="keyword">break</span>; } setPolygon(myPolygon); setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemIsMovable<span class="operator">,</span> <span class="keyword">true</span>); setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemIsSelectable<span class="operator">,</span> <span class="keyword">true</span>); setFlag(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemSendsGeometryChanges<span class="operator">,</span> <span class="keyword">true</span>); } <span class="type">void</span> DiagramItem<span class="operator">::</span>removeArrow(Arrow <span class="operator">*</span>arrow) { <span class="type">int</span> index <span class="operator">=</span> arrows<span class="operator">.</span>indexOf(arrow); <span class="keyword">if</span> (index <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) arrows<span class="operator">.</span>removeAt(index); } <span class="type">void</span> DiagramItem<span class="operator">::</span>removeArrows() { foreach (Arrow <span class="operator">*</span>arrow<span class="operator">,</span> arrows) { arrow<span class="operator">-</span><span class="operator">></span>startItem()<span class="operator">-</span><span class="operator">></span>removeArrow(arrow); arrow<span class="operator">-</span><span class="operator">></span>endItem()<span class="operator">-</span><span class="operator">></span>removeArrow(arrow); scene()<span class="operator">-</span><span class="operator">></span>removeItem(arrow); <span class="keyword">delete</span> arrow; } } <span class="type">void</span> DiagramItem<span class="operator">::</span>addArrow(Arrow <span class="operator">*</span>arrow) { arrows<span class="operator">.</span>append(arrow); } <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> DiagramItem<span class="operator">::</span>image() <span class="keyword">const</span> { <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap(<span class="number">250</span><span class="operator">,</span> <span class="number">250</span>); pixmap<span class="operator">.</span>fill(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>transparent); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>pixmap); painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>black<span class="operator">,</span> <span class="number">8</span>)); painter<span class="operator">.</span>translate(<span class="number">125</span><span class="operator">,</span> <span class="number">125</span>); painter<span class="operator">.</span>drawPolyline(myPolygon); <span class="keyword">return</span> pixmap; } <span class="type">void</span> DiagramItem<span class="operator">::</span>contextMenuEvent(<span class="type"><a href="qgraphicsscenecontextmenuevent.html">QGraphicsSceneContextMenuEvent</a></span> <span class="operator">*</span>event) { scene()<span class="operator">-</span><span class="operator">></span>clearSelection(); setSelected(<span class="keyword">true</span>); myContextMenu<span class="operator">-</span><span class="operator">></span>exec(event<span class="operator">-</span><span class="operator">></span>screenPos()); } <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> DiagramItem<span class="operator">::</span>itemChange(GraphicsItemChange change<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&</span>value) { <span class="keyword">if</span> (change <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span><span class="operator">::</span>ItemPositionChange) { foreach (Arrow <span class="operator">*</span>arrow<span class="operator">,</span> arrows) { arrow<span class="operator">-</span><span class="operator">></span>updatePosition(); } } <span class="keyword">return</span> value; } </pre> </div> <!-- @@@graphicsview/diagramscene/diagramitem.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>