<?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-scatterinteractions-example.html">Scatter Interactions 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">scatterinteractions/chartview.cpp</span> <!-- $$$scatterinteractions/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 <QtCore/QtMath></span> <span class="preprocessor">#include <QtCore/QDebug></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>(<span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>()<span class="operator">,</span> parent)<span class="operator">,</span> m_scatter(<span class="number">0</span>)<span class="operator">,</span> m_scatter2(<span class="number">0</span>) { setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing); chart()<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Click to interact with scatter points"</span>); m_scatter <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscatterseries.html">QScatterSeries</a></span>(); m_scatter<span class="operator">-</span><span class="operator">></span>setName(<span class="string">"scatter1"</span>); <span class="keyword">for</span> (<span class="type">qreal</span> x(<span class="number">0.5</span>); x <span class="operator"><</span><span class="operator">=</span> <span class="number">4.0</span>; x <span class="operator">+</span><span class="operator">=</span> <span class="number">0.5</span>) { <span class="keyword">for</span> (<span class="type">qreal</span> y(<span class="number">0.5</span>); y <span class="operator"><</span><span class="operator">=</span> <span class="number">4.0</span>; y <span class="operator">+</span><span class="operator">=</span> <span class="number">0.5</span>) <span class="operator">*</span>m_scatter <span class="operator"><</span><span class="operator"><</span> <span class="type">QPointF</span>(x<span class="operator">,</span> y); } m_scatter2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscatterseries.html">QScatterSeries</a></span>(); m_scatter2<span class="operator">-</span><span class="operator">></span>setName(<span class="string">"scatter2"</span>); chart()<span class="operator">-</span><span class="operator">></span>addSeries(m_scatter2); chart()<span class="operator">-</span><span class="operator">></span>addSeries(m_scatter); chart()<span class="operator">-</span><span class="operator">></span>createDefaultAxes(); chart()<span class="operator">-</span><span class="operator">></span>axes(<span class="type">Qt</span><span class="operator">::</span>Horizontal)<span class="operator">.</span>first()<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">4.5</span>); chart()<span class="operator">-</span><span class="operator">></span>axes(<span class="type">Qt</span><span class="operator">::</span>Vertical)<span class="operator">.</span>first()<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">4.5</span>); connect(m_scatter<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qscatterseries.html">QScatterSeries</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>ChartView<span class="operator">::</span>handleClickedPoint); } ChartView<span class="operator">::</span><span class="operator">~</span>ChartView() { } <span class="type">void</span> ChartView<span class="operator">::</span>handleClickedPoint(<span class="keyword">const</span> <span class="type">QPointF</span> <span class="operator">&</span>point) { <span class="type">QPointF</span> clickedPoint <span class="operator">=</span> point; <span class="comment">// Find the closest point from series 1</span> <span class="type">QPointF</span> closest(INT_MAX<span class="operator">,</span> INT_MAX); <span class="type">qreal</span> distance(INT_MAX); <span class="keyword">const</span> <span class="keyword">auto</span> points <span class="operator">=</span> m_scatter<span class="operator">-</span><span class="operator">></span>points(); <span class="keyword">for</span> (<span class="keyword">const</span> <span class="type">QPointF</span> <span class="operator">&</span>currentPoint : points) { <span class="type">qreal</span> currentDistance <span class="operator">=</span> qSqrt((currentPoint<span class="operator">.</span>x() <span class="operator">-</span> clickedPoint<span class="operator">.</span>x()) <span class="operator">*</span> (currentPoint<span class="operator">.</span>x() <span class="operator">-</span> clickedPoint<span class="operator">.</span>x()) <span class="operator">+</span> (currentPoint<span class="operator">.</span>y() <span class="operator">-</span> clickedPoint<span class="operator">.</span>y()) <span class="operator">*</span> (currentPoint<span class="operator">.</span>y() <span class="operator">-</span> clickedPoint<span class="operator">.</span>y())); <span class="keyword">if</span> (currentDistance <span class="operator"><</span> distance) { distance <span class="operator">=</span> currentDistance; closest <span class="operator">=</span> currentPoint; } } <span class="comment">// Remove the closes point from series 1 and append it to series 2</span> m_scatter<span class="operator">-</span><span class="operator">></span>remove(closest); m_scatter2<span class="operator">-</span><span class="operator">></span>append(closest); } </pre> </div> <!-- @@@scatterinteractions/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>