<?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>xyseriesiodevice.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-audio-example.html">Audio Example</a></td><td >xyseriesiodevice.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">xyseriesiodevice.cpp Example File</h1> <span class="subtitle">audio/xyseriesiodevice.cpp</span> <!-- $$$audio/xyseriesiodevice.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 "xyseriesiodevice.h"</span> <span class="preprocessor">#include <QtCharts/QXYSeries></span> XYSeriesIODevice<span class="operator">::</span>XYSeriesIODevice(<span class="type"><a href="qxyseries.html">QXYSeries</a></span> <span class="operator">*</span> series<span class="operator">,</span> <span class="type">QObject</span> <span class="operator">*</span>parent) : <span class="type">QIODevice</span>(parent)<span class="operator">,</span> m_series(series) { } <span class="type">qint64</span> XYSeriesIODevice<span class="operator">::</span>readData(<span class="type">char</span> <span class="operator">*</span> data<span class="operator">,</span> <span class="type">qint64</span> maxSize) { Q_UNUSED(data) Q_UNUSED(maxSize) <span class="keyword">return</span> <span class="operator">-</span><span class="number">1</span>; } <span class="type">qint64</span> XYSeriesIODevice<span class="operator">::</span>writeData(<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span> data<span class="operator">,</span> <span class="type">qint64</span> maxSize) { <span class="type">qint64</span> range <span class="operator">=</span> <span class="number">2000</span>; <span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> oldPoints <span class="operator">=</span> m_series<span class="operator">-</span><span class="operator">></span>pointsVector(); <span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> points; <span class="type">int</span> resolution <span class="operator">=</span> <span class="number">4</span>; <span class="keyword">if</span> (oldPoints<span class="operator">.</span>count() <span class="operator"><</span> range) { points <span class="operator">=</span> m_series<span class="operator">-</span><span class="operator">></span>pointsVector(); } <span class="keyword">else</span> { <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> maxSize<span class="operator">/</span>resolution; i <span class="operator"><</span> oldPoints<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>) points<span class="operator">.</span>append(<span class="type">QPointF</span>(i <span class="operator">-</span> maxSize<span class="operator">/</span>resolution<span class="operator">,</span> oldPoints<span class="operator">.</span>at(i)<span class="operator">.</span>y())); } <span class="type">qint64</span> size <span class="operator">=</span> points<span class="operator">.</span>count(); <span class="keyword">for</span> (<span class="type">int</span> k <span class="operator">=</span> <span class="number">0</span>; k <span class="operator"><</span> maxSize<span class="operator">/</span>resolution; k<span class="operator">+</span><span class="operator">+</span>) points<span class="operator">.</span>append(<span class="type">QPointF</span>(k <span class="operator">+</span> size<span class="operator">,</span> ((<span class="type">quint8</span>)data<span class="operator">[</span>resolution <span class="operator">*</span> k<span class="operator">]</span> <span class="operator">-</span> <span class="number">128</span>)<span class="operator">/</span><span class="number">128.0</span>)); m_series<span class="operator">-</span><span class="operator">></span>replace(points); <span class="keyword">return</span> maxSize; } </pre> </div> <!-- @@@audio/xyseriesiodevice.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. 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