<?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>main.cpp Example File | Qt Charts 5.11</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 ><a href="../qtdoc/index.html">Qt 5.11</a></td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-datetimeaxis-example.html">DateTimeAxis Example</a></td><td >main.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.11.2 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">main.cpp Example File</h1> <span class="subtitle">datetimeaxis/main.cpp</span> <!-- $$$datetimeaxis/main.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 <QtWidgets/QApplication></span> <span class="preprocessor">#include <QtWidgets/QMainWindow></span> <span class="preprocessor">#include <QtCharts/QChartView></span> <span class="preprocessor">#include <QtCharts/QLineSeries></span> <span class="preprocessor">#include <QtCore/QDateTime></span> <span class="preprocessor">#include <QtCharts/QDateTimeAxis></span> <span class="preprocessor">#include <QtCore/QFile></span> <span class="preprocessor">#include <QtCore/QTextStream></span> <span class="preprocessor">#include <QtCore/QDebug></span> <span class="preprocessor">#include <QtCharts/QValueAxis></span> QT_CHARTS_USE_NAMESPACE <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>) { <span class="type"><a href="../qtwidgets/qapplication.html">QApplication</a></span> a(argc<span class="operator">,</span> argv); <span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>(); <span class="comment">// data from http://www.swpc.noaa.gov/ftpdir/weekly/RecentIndices.txt</span> <span class="comment">// http://www.swpc.noaa.gov/ftpdir/weekly/README</span> <span class="comment">// http://www.weather.gov/disclaimer</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> sunSpots(<span class="string">":sun"</span>); <span class="keyword">if</span> (<span class="operator">!</span>sunSpots<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>Text)) { <span class="keyword">return</span> <span class="number">1</span>; } <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> stream(<span class="operator">&</span>sunSpots); <span class="keyword">while</span> (<span class="operator">!</span>stream<span class="operator">.</span>atEnd()) { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> line <span class="operator">=</span> stream<span class="operator">.</span>readLine(); <span class="keyword">if</span> (line<span class="operator">.</span>startsWith(<span class="string">"#"</span>) <span class="operator">|</span><span class="operator">|</span> line<span class="operator">.</span>startsWith(<span class="string">":"</span>)) <span class="keyword">continue</span>; <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> values <span class="operator">=</span> line<span class="operator">.</span>split(<span class="string">" "</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>SkipEmptyParts); <span class="type"><a href="../qtcore/qdatetime.html">QDateTime</a></span> momentInTime; momentInTime<span class="operator">.</span>setDate(<span class="type"><a href="../qtcore/qdate.html">QDate</a></span>(values<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">.</span>toInt()<span class="operator">,</span> values<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">.</span>toInt() <span class="operator">,</span> <span class="number">15</span>)); series<span class="operator">-</span><span class="operator">></span>append(momentInTime<span class="operator">.</span>toMSecsSinceEpoch()<span class="operator">,</span> values<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">.</span>toDouble()); } sunSpots<span class="operator">.</span>close(); <span class="type"><a href="qchart.html">QChart</a></span> <span class="operator">*</span>chart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>(); chart<span class="operator">-</span><span class="operator">></span>addSeries(series); chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>hide(); chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Sunspots count (by Space Weather Prediction Center)"</span>); <span class="type"><a href="qdatetimeaxis.html">QDateTimeAxis</a></span> <span class="operator">*</span>axisX <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qdatetimeaxis.html">QDateTimeAxis</a></span>; axisX<span class="operator">-</span><span class="operator">></span>setTickCount(<span class="number">10</span>); axisX<span class="operator">-</span><span class="operator">></span>setFormat(<span class="string">"MMM yyyy"</span>); axisX<span class="operator">-</span><span class="operator">></span>setTitleText(<span class="string">"Date"</span>); chart<span class="operator">-</span><span class="operator">></span>addAxis(axisX<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignBottom); series<span class="operator">-</span><span class="operator">></span>attachAxis(axisX); <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span> <span class="operator">*</span>axisY <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span>; axisY<span class="operator">-</span><span class="operator">></span>setLabelFormat(<span class="string">"%i"</span>); axisY<span class="operator">-</span><span class="operator">></span>setTitleText(<span class="string">"Sunspots count"</span>); chart<span class="operator">-</span><span class="operator">></span>addAxis(axisY<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignLeft); series<span class="operator">-</span><span class="operator">></span>attachAxis(axisY); <span class="type"><a href="qchartview.html">QChartView</a></span> <span class="operator">*</span>chartView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchartview.html">QChartView</a></span>(chart); chartView<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing); <span class="type"><a href="../qtwidgets/qmainwindow.html">QMainWindow</a></span> window; window<span class="operator">.</span>setCentralWidget(chartView); window<span class="operator">.</span>resize(<span class="number">820</span><span class="operator">,</span> <span class="number">600</span>); window<span class="operator">.</span>show(); <span class="keyword">return</span> a<span class="operator">.</span>exec(); } </pre> </div> <!-- @@@datetimeaxis/main.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2018 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>