<?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>chartview.cpp Example File | Qt Charts 5.12.6</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 5.12</td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-polarchart-example.html">Polar Chart Example</a></td><td >chartview.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtcharts-index.html">Qt Charts | Commercial or GPLv3</a></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">chartview.cpp Example File</h1> <span class="subtitle">polarchart/chartview.cpp</span> <!-- $$$polarchart/chartview.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 "chartview.h"</span> <span class="preprocessor">#include <QtGui/QMouseEvent></span> <span class="preprocessor">#include <QtCore/QDebug></span> <span class="preprocessor">#include <QtCharts/QAbstractAxis></span> <span class="preprocessor">#include <QtCharts/QValueAxis></span> QT_CHARTS_USE_NAMESPACE ChartView<span class="operator">::</span>ChartView(<span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type"><a href="qchartview.html">QChartView</a></span>(parent) { } <span class="type">void</span> ChartView<span class="operator">::</span>keyPressEvent(<span class="type">QKeyEvent</span> <span class="operator">*</span>event) { <span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>key()) { <span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_Plus: chart()<span class="operator">-</span><span class="operator">></span>zoomIn(); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_Minus: chart()<span class="operator">-</span><span class="operator">></span>zoomOut(); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_Left: chart()<span class="operator">-</span><span class="operator">></span>scroll(<span class="operator">-</span><span class="number">1.0</span><span class="operator">,</span> <span class="number">0</span>); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_Right: chart()<span class="operator">-</span><span class="operator">></span>scroll(<span class="number">1.0</span><span class="operator">,</span> <span class="number">0</span>); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_Up: chart()<span class="operator">-</span><span class="operator">></span>scroll(<span class="number">0</span><span class="operator">,</span> <span class="number">1.0</span>); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_Down: chart()<span class="operator">-</span><span class="operator">></span>scroll(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1.0</span>); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_Space: switchChartType(); <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="type">QGraphicsView</span><span class="operator">::</span>keyPressEvent(event); <span class="keyword">break</span>; } } <span class="type">void</span> ChartView<span class="operator">::</span>switchChartType() { <span class="type"><a href="qchart.html">QChart</a></span> <span class="operator">*</span>newChart; <span class="type"><a href="qchart.html">QChart</a></span> <span class="operator">*</span>oldChart <span class="operator">=</span> chart(); <span class="keyword">if</span> (oldChart<span class="operator">-</span><span class="operator">></span>chartType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartTypeCartesian) newChart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpolarchart.html">QPolarChart</a></span>(); <span class="keyword">else</span> newChart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>(); <span class="comment">// Move series and axes from old chart to new one</span> <span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qabstractseries.html">QAbstractSeries</a></span> <span class="operator">*</span><span class="operator">></span> seriesList <span class="operator">=</span> oldChart<span class="operator">-</span><span class="operator">></span>series(); <span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qabstractaxis.html">QAbstractAxis</a></span> <span class="operator">*</span><span class="operator">></span> axisList <span class="operator">=</span> oldChart<span class="operator">-</span><span class="operator">></span>axes(); <span class="type">QList</span><span class="operator"><</span><span class="type">QPair</span><span class="operator"><</span><span class="type">qreal</span><span class="operator">,</span> <span class="type">qreal</span><span class="operator">></span> <span class="operator">></span> axisRanges; <span class="keyword">for</span> (<span class="type"><a href="qabstractaxis.html">QAbstractAxis</a></span> <span class="operator">*</span>axis : axisList) { <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span> <span class="operator">*</span>valueAxis <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qvalueaxis.html">QValueAxis</a></span> <span class="operator">*</span><span class="operator">></span>(axis); axisRanges<span class="operator">.</span>append(<span class="type">QPair</span><span class="operator"><</span><span class="type">qreal</span><span class="operator">,</span> <span class="type">qreal</span><span class="operator">></span>(valueAxis<span class="operator">-</span><span class="operator">></span>min()<span class="operator">,</span> valueAxis<span class="operator">-</span><span class="operator">></span>max())); } <span class="keyword">for</span> (<span class="type"><a href="qabstractseries.html">QAbstractSeries</a></span> <span class="operator">*</span>series : seriesList) oldChart<span class="operator">-</span><span class="operator">></span>removeSeries(series); <span class="keyword">for</span> (<span class="type"><a href="qabstractaxis.html">QAbstractAxis</a></span> <span class="operator">*</span>axis : axisList) { oldChart<span class="operator">-</span><span class="operator">></span>removeAxis(axis); newChart<span class="operator">-</span><span class="operator">></span>addAxis(axis<span class="operator">,</span> axis<span class="operator">-</span><span class="operator">></span>alignment()); } <span class="keyword">for</span> (<span class="type"><a href="qabstractseries.html">QAbstractSeries</a></span> <span class="operator">*</span>series : seriesList) { newChart<span class="operator">-</span><span class="operator">></span>addSeries(series); <span class="keyword">for</span> (<span class="type"><a href="qabstractaxis.html">QAbstractAxis</a></span> <span class="operator">*</span>axis : axisList) series<span class="operator">-</span><span class="operator">></span>attachAxis(axis); } <span class="type">int</span> count <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">for</span> (<span class="type"><a href="qabstractaxis.html">QAbstractAxis</a></span> <span class="operator">*</span>axis : axisList) { axis<span class="operator">-</span><span class="operator">></span>setRange(axisRanges<span class="operator">[</span>count<span class="operator">]</span><span class="operator">.</span>first<span class="operator">,</span> axisRanges<span class="operator">[</span>count<span class="operator">]</span><span class="operator">.</span>second); count<span class="operator">+</span><span class="operator">+</span>; } newChart<span class="operator">-</span><span class="operator">></span>setTitle(oldChart<span class="operator">-</span><span class="operator">></span>title()); setChart(newChart); <span class="keyword">delete</span> oldChart; } </pre> </div> <!-- @@@polarchart/chartview.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 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>