<?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>graph.cpp Example File | Qt Quick 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="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-scenegraph-graph-example.html">Scene Graph - Graph</a></td><td >graph.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">graph.cpp Example File</h1> <span class="subtitle">scenegraph/graph/graph.cpp</span> <!-- $$$scenegraph/graph/graph.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 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 "graph.h"</span> <span class="preprocessor">#include "noisynode.h"</span> <span class="preprocessor">#include "gridnode.h"</span> <span class="preprocessor">#include "linenode.h"</span> Graph<span class="operator">::</span>Graph() : m_samplesChanged(<span class="keyword">false</span>) <span class="operator">,</span> m_geometryChanged(<span class="keyword">false</span>) { setFlag(ItemHasContents<span class="operator">,</span> <span class="keyword">true</span>); } <span class="type">void</span> Graph<span class="operator">::</span>appendSample(<span class="type">qreal</span> value) { m_samples <span class="operator"><</span><span class="operator"><</span> value; m_samplesChanged <span class="operator">=</span> <span class="keyword">true</span>; update(); } <span class="type">void</span> Graph<span class="operator">::</span>removeFirstSample() { m_samples<span class="operator">.</span>removeFirst(); m_samplesChanged <span class="operator">=</span> <span class="keyword">true</span>; update(); } <span class="type">void</span> Graph<span class="operator">::</span>geometryChanged(<span class="keyword">const</span> <span class="type">QRectF</span> <span class="operator">&</span>newGeometry<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QRectF</span> <span class="operator">&</span>oldGeometry) { m_geometryChanged <span class="operator">=</span> <span class="keyword">true</span>; update(); <span class="type"><a href="qquickitem.html">QQuickItem</a></span><span class="operator">::</span>geometryChanged(newGeometry<span class="operator">,</span> oldGeometry); } <span class="keyword">class</span> GraphNode : <span class="keyword">public</span> <span class="type"><a href="qsgnode.html">QSGNode</a></span> { <span class="keyword">public</span>: NoisyNode <span class="operator">*</span>background; GridNode <span class="operator">*</span>grid; LineNode <span class="operator">*</span>line; LineNode <span class="operator">*</span>shadow; }; <span class="type"><a href="qsgnode.html">QSGNode</a></span> <span class="operator">*</span>Graph<span class="operator">::</span>updatePaintNode(<span class="type"><a href="qsgnode.html">QSGNode</a></span> <span class="operator">*</span>oldNode<span class="operator">,</span> UpdatePaintNodeData <span class="operator">*</span>) { GraphNode <span class="operator">*</span>n<span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span>GraphNode <span class="operator">*</span><span class="operator">></span>(oldNode); <span class="type">QRectF</span> rect <span class="operator">=</span> boundingRect(); <span class="keyword">if</span> (rect<span class="operator">.</span>isEmpty()) { <span class="keyword">delete</span> n; <span class="keyword">return</span> <span class="number">0</span>; } <span class="keyword">if</span> (<span class="operator">!</span>n) { n <span class="operator">=</span> <span class="keyword">new</span> GraphNode(); n<span class="operator">-</span><span class="operator">></span>background <span class="operator">=</span> <span class="keyword">new</span> NoisyNode(window()); n<span class="operator">-</span><span class="operator">></span>grid <span class="operator">=</span> <span class="keyword">new</span> GridNode(); n<span class="operator">-</span><span class="operator">></span>line <span class="operator">=</span> <span class="keyword">new</span> LineNode(<span class="number">10</span><span class="operator">,</span> <span class="number">0.5</span><span class="operator">,</span> <span class="type">QColor</span>(<span class="string">"steelblue"</span>)); n<span class="operator">-</span><span class="operator">></span>shadow <span class="operator">=</span> <span class="keyword">new</span> LineNode(<span class="number">20</span><span class="operator">,</span> <span class="number">0.2f</span><span class="operator">,</span> <span class="type">QColor</span><span class="operator">::</span>fromRgbF(<span class="number">0.2</span><span class="operator">,</span> <span class="number">0.2</span><span class="operator">,</span> <span class="number">0.2</span><span class="operator">,</span> <span class="number">0.4</span>)); n<span class="operator">-</span><span class="operator">></span>appendChildNode(n<span class="operator">-</span><span class="operator">></span>background); n<span class="operator">-</span><span class="operator">></span>appendChildNode(n<span class="operator">-</span><span class="operator">></span>grid); n<span class="operator">-</span><span class="operator">></span>appendChildNode(n<span class="operator">-</span><span class="operator">></span>shadow); n<span class="operator">-</span><span class="operator">></span>appendChildNode(n<span class="operator">-</span><span class="operator">></span>line); } <span class="keyword">if</span> (m_geometryChanged) { n<span class="operator">-</span><span class="operator">></span>background<span class="operator">-</span><span class="operator">></span>setRect(rect); n<span class="operator">-</span><span class="operator">></span>grid<span class="operator">-</span><span class="operator">></span>setRect(rect); } <span class="keyword">if</span> (m_geometryChanged <span class="operator">|</span><span class="operator">|</span> m_samplesChanged) { n<span class="operator">-</span><span class="operator">></span>line<span class="operator">-</span><span class="operator">></span>updateGeometry(rect<span class="operator">,</span> m_samples); <span class="comment">// We don't need to calculate the geometry twice, so just steal it from the other one...</span> n<span class="operator">-</span><span class="operator">></span>shadow<span class="operator">-</span><span class="operator">></span>setGeometry(n<span class="operator">-</span><span class="operator">></span>line<span class="operator">-</span><span class="operator">></span>geometry()); } m_geometryChanged <span class="operator">=</span> <span class="keyword">false</span>; m_samplesChanged <span class="operator">=</span> <span class="keyword">false</span>; <span class="keyword">return</span> n; } </pre> </div> <!-- @@@scenegraph/graph/graph.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>