<?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>datasource.cpp Example File | Qt Charts 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="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-openglseries-example.html">OpenGL Accelerated Series Example</a></td><td >datasource.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">datasource.cpp Example File</h1> <span class="subtitle">openglseries/datasource.cpp</span> <!-- $$$openglseries/datasource.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 Qt Charts module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:GPL$ ** 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. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3 or (at your option) any later version ** approved by the KDE Free Qt Foundation. The licenses are as published by ** the Free Software Foundation and appearing in the file LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "datasource.h"</span> <span class="preprocessor">#include <QtCore/QtMath></span> QT_CHARTS_USE_NAMESPACE DataSource<span class="operator">::</span>DataSource(<span class="type">QObject</span> <span class="operator">*</span>parent) : <span class="type">QObject</span>(parent)<span class="operator">,</span> m_index(<span class="operator">-</span><span class="number">1</span>) { generateData(<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">void</span> DataSource<span class="operator">::</span>update(<span class="type"><a href="qabstractseries.html">QAbstractSeries</a></span> <span class="operator">*</span>series<span class="operator">,</span> <span class="type">int</span> seriesIndex) { <span class="keyword">if</span> (series) { <span class="type"><a href="qxyseries.html">QXYSeries</a></span> <span class="operator">*</span>xySeries <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qxyseries.html">QXYSeries</a></span> <span class="operator">*</span><span class="operator">></span>(series); <span class="keyword">const</span> <span class="type">QVector</span><span class="operator"><</span><span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> <span class="operator">></span> <span class="operator">&</span>seriesData <span class="operator">=</span> m_data<span class="operator">.</span>at(seriesIndex); <span class="keyword">if</span> (seriesIndex <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) m_index<span class="operator">+</span><span class="operator">+</span>; <span class="keyword">if</span> (m_index <span class="operator">></span> seriesData<span class="operator">.</span>count() <span class="operator">-</span> <span class="number">1</span>) m_index <span class="operator">=</span> <span class="number">0</span>; <span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> points <span class="operator">=</span> seriesData<span class="operator">.</span>at(m_index); <span class="comment">// Use replace instead of clear + append, it's optimized for performance</span> xySeries<span class="operator">-</span><span class="operator">></span>replace(points); } } <span class="type">void</span> DataSource<span class="operator">::</span>handleSceneChanged() { m_dataUpdater<span class="operator">.</span>start(); } <span class="type">void</span> DataSource<span class="operator">::</span>updateAllSeries() { <span class="keyword">static</span> <span class="type">int</span> frameCount <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">static</span> <span class="type">QString</span> labelText <span class="operator">=</span> <span class="type">QStringLiteral</span>(<span class="string">"FPS: %1"</span>); <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> m_seriesList<span class="operator">.</span>size(); i<span class="operator">+</span><span class="operator">+</span>) update(m_seriesList<span class="operator">[</span>i<span class="operator">]</span><span class="operator">,</span> i); frameCount<span class="operator">+</span><span class="operator">+</span>; <span class="type">int</span> elapsed <span class="operator">=</span> m_fpsTimer<span class="operator">.</span>elapsed(); <span class="keyword">if</span> (elapsed <span class="operator">></span><span class="operator">=</span> <span class="number">1000</span>) { elapsed <span class="operator">=</span> m_fpsTimer<span class="operator">.</span>restart(); <span class="type">qreal</span> fps <span class="operator">=</span> <span class="type">qreal</span>(<span class="number">0.1</span> <span class="operator">*</span> <span class="type">int</span>(<span class="number">10000.0</span> <span class="operator">*</span> (<span class="type">qreal</span>(frameCount) <span class="operator">/</span> <span class="type">qreal</span>(elapsed)))); m_fpsLabel<span class="operator">-</span><span class="operator">></span>setText(labelText<span class="operator">.</span>arg(<span class="type">QString</span><span class="operator">::</span>number(fps<span class="operator">,</span> <span class="char">'f'</span><span class="operator">,</span> <span class="number">1</span>))); m_fpsLabel<span class="operator">-</span><span class="operator">></span>adjustSize(); frameCount <span class="operator">=</span> <span class="number">0</span>; } } <span class="type">void</span> DataSource<span class="operator">::</span>startUpdates(<span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qxyseries.html">QXYSeries</a></span> <span class="operator">*</span><span class="operator">></span> <span class="operator">&</span>seriesList<span class="operator">,</span> <span class="type">QLabel</span> <span class="operator">*</span>fpsLabel) { m_seriesList <span class="operator">=</span> seriesList; m_fpsLabel <span class="operator">=</span> fpsLabel; m_dataUpdater<span class="operator">.</span>setInterval(<span class="number">0</span>); m_dataUpdater<span class="operator">.</span>setSingleShot(<span class="keyword">true</span>); <span class="type">QObject</span><span class="operator">::</span>connect(<span class="operator">&</span>m_dataUpdater<span class="operator">,</span> <span class="operator">&</span><span class="type">QTimer</span><span class="operator">::</span>timeout<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>DataSource<span class="operator">::</span>updateAllSeries); m_fpsTimer<span class="operator">.</span>start(); updateAllSeries(); } <span class="type">void</span> DataSource<span class="operator">::</span>generateData(<span class="type">int</span> seriesCount<span class="operator">,</span> <span class="type">int</span> rowCount<span class="operator">,</span> <span class="type">int</span> colCount) { m_data<span class="operator">.</span>clear(); <span class="type">qreal</span> xAdjustment <span class="operator">=</span> <span class="number">20.0</span> <span class="operator">/</span> (colCount <span class="operator">*</span> rowCount); <span class="type">qreal</span> yMultiplier <span class="operator">=</span> <span class="number">3.0</span> <span class="operator">/</span> <span class="type">qreal</span>(seriesCount); <span class="comment">// Append the new data depending on the type</span> <span class="keyword">for</span> (<span class="type">int</span> k(<span class="number">0</span>); k <span class="operator"><</span> seriesCount; k<span class="operator">+</span><span class="operator">+</span>) { <span class="type">QVector</span><span class="operator"><</span><span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> <span class="operator">></span> seriesData; <span class="type">qreal</span> height <span class="operator">=</span> <span class="type">qreal</span>(k) <span class="operator">*</span> (<span class="number">10.0</span> <span class="operator">/</span> <span class="type">qreal</span>(seriesCount)) <span class="operator">+</span> <span class="number">0.3</span>; <span class="keyword">for</span> (<span class="type">int</span> i(<span class="number">0</span>); i <span class="operator"><</span> rowCount; i<span class="operator">+</span><span class="operator">+</span>) { <span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> points; points<span class="operator">.</span>reserve(colCount); <span class="keyword">for</span> (<span class="type">int</span> j(<span class="number">0</span>); j <span class="operator"><</span> colCount; j<span class="operator">+</span><span class="operator">+</span>) { <span class="type">qreal</span> x(<span class="number">0</span>); <span class="type">qreal</span> y(<span class="number">0</span>); <span class="comment">// data with sin + random component</span> y <span class="operator">=</span> height <span class="operator">+</span> (yMultiplier <span class="operator">*</span> qSin(<span class="number">3.14159265358979</span> <span class="operator">/</span> <span class="number">50</span> <span class="operator">*</span> j) <span class="operator">+</span> (yMultiplier <span class="operator">*</span> (<span class="type">qreal</span>) rand() <span class="operator">/</span> (<span class="type">qreal</span>) RAND_MAX)); <span class="comment">// 0.000001 added to make values logaxis compatible</span> x <span class="operator">=</span> <span class="number">0.000001</span> <span class="operator">+</span> <span class="number">20.0</span> <span class="operator">*</span> (<span class="type">qreal</span>(j) <span class="operator">/</span> <span class="type">qreal</span>(colCount)) <span class="operator">+</span> (xAdjustment <span class="operator">*</span> <span class="type">qreal</span>(i)); points<span class="operator">.</span>append(<span class="type">QPointF</span>(x<span class="operator">,</span> y)); } seriesData<span class="operator">.</span>append(points); } m_data<span class="operator">.</span>append(seriesData); } } </pre> </div> <!-- @@@openglseries/datasource.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>