<?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>mainwidget.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-legendmarkers-example.html">LegendMarkers Example</a></td><td >mainwidget.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">mainwidget.cpp Example File</h1> <span class="subtitle">legendmarkers/mainwidget.cpp</span> <!-- $$$legendmarkers/mainwidget.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 "mainwidget.h"</span> <span class="preprocessor">#include <QtCharts/QChart></span> <span class="preprocessor">#include <QtCharts/QChartView></span> <span class="preprocessor">#include <QtWidgets/QPushButton></span> <span class="preprocessor">#include <QtWidgets/QLabel></span> <span class="preprocessor">#include <QtCore/QDebug></span> <span class="preprocessor">#include <QtCharts/QLegend></span> <span class="preprocessor">#include <QtWidgets/QFormLayout></span> <span class="preprocessor">#include <QtCharts/QLegendMarker></span> <span class="preprocessor">#include <QtCharts/QLineSeries></span> <span class="preprocessor">#include <QtCharts/QXYLegendMarker></span> <span class="preprocessor">#include <QtCore/QtMath></span> QT_CHARTS_USE_NAMESPACE MainWidget<span class="operator">::</span>MainWidget(<span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type">QWidget</span>(parent) { <span class="comment">// Create chart view with the chart</span> m_chart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>(); m_chartView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchartview.html">QChartView</a></span>(m_chart<span class="operator">,</span> <span class="keyword">this</span>); <span class="comment">// Create layout for grid and detached legend</span> m_mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGridLayout</span>(); m_mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_chartView<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">1</span>); setLayout(m_mainLayout); <span class="comment">// Add few series</span> addSeries(); addSeries(); addSeries(); addSeries(); connectMarkers(); <span class="comment">// Set the title and show legend</span> m_chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Legendmarker example (click on legend)"</span>); m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">true</span>); m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type">Qt</span><span class="operator">::</span>AlignBottom); m_chartView<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing); } <span class="type">void</span> MainWidget<span class="operator">::</span>addSeries() { <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>(); m_series<span class="operator">.</span>append(series); series<span class="operator">-</span><span class="operator">></span>setName(<span class="type">QString</span>(<span class="string">"line "</span> <span class="operator">+</span> <span class="type">QString</span><span class="operator">::</span>number(m_series<span class="operator">.</span>count()))); <span class="comment">// Make some sine wave for data</span> <span class="type">QList</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> data; <span class="type">int</span> offset <span class="operator">=</span> m_chart<span class="operator">-</span><span class="operator">></span>series()<span class="operator">.</span>count(); <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> <span class="number">360</span>; i<span class="operator">+</span><span class="operator">+</span>) { <span class="type">qreal</span> x <span class="operator">=</span> offset <span class="operator">*</span> <span class="number">20</span> <span class="operator">+</span> i; data<span class="operator">.</span>append(<span class="type">QPointF</span>(i<span class="operator">,</span> qSin(qDegreesToRadians(x)))); } series<span class="operator">-</span><span class="operator">></span>append(data); m_chart<span class="operator">-</span><span class="operator">></span>addSeries(series); <span class="keyword">if</span> (m_series<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>) m_chart<span class="operator">-</span><span class="operator">></span>createDefaultAxes(); } <span class="type">void</span> MainWidget<span class="operator">::</span>removeSeries() { <span class="comment">// Remove last series from chart</span> <span class="keyword">if</span> (m_series<span class="operator">.</span>count() <span class="operator">></span> <span class="number">0</span>) { <span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> m_series<span class="operator">.</span>last(); m_chart<span class="operator">-</span><span class="operator">></span>removeSeries(series); m_series<span class="operator">.</span>removeLast(); <span class="keyword">delete</span> series; } } <span class="type">void</span> MainWidget<span class="operator">::</span>connectMarkers() { <span class="comment">// Connect all markers to handler</span> <span class="keyword">const</span> <span class="keyword">auto</span> markers <span class="operator">=</span> m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>markers(); <span class="keyword">for</span> (<span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span> <span class="operator">*</span>marker : markers) { <span class="comment">// Disconnect possible existing connection to avoid multiple connections</span> <span class="type">QObject</span><span class="operator">::</span>disconnect(marker<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWidget<span class="operator">::</span>handleMarkerClicked); <span class="type">QObject</span><span class="operator">::</span>connect(marker<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWidget<span class="operator">::</span>handleMarkerClicked); } } <span class="type">void</span> MainWidget<span class="operator">::</span>disconnectMarkers() { <span class="keyword">const</span> <span class="keyword">auto</span> markers <span class="operator">=</span> m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>markers(); <span class="keyword">for</span> (<span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span> <span class="operator">*</span>marker : markers) { <span class="type">QObject</span><span class="operator">::</span>disconnect(marker<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWidget<span class="operator">::</span>handleMarkerClicked); } } <span class="type">void</span> MainWidget<span class="operator">::</span>handleMarkerClicked() { <span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">*</span> marker <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">*</span><span class="operator">></span> (sender()); Q_ASSERT(marker); <span class="keyword">switch</span> (marker<span class="operator">-</span><span class="operator">></span>type()) { <span class="keyword">case</span> <span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">::</span>LegendMarkerTypeXY: { <span class="comment">// Toggle visibility of series</span> marker<span class="operator">-</span><span class="operator">></span>series()<span class="operator">-</span><span class="operator">></span>setVisible(<span class="operator">!</span>marker<span class="operator">-</span><span class="operator">></span>series()<span class="operator">-</span><span class="operator">></span>isVisible()); <span class="comment">// Turn legend marker back to visible, since hiding series also hides the marker</span> <span class="comment">// and we don't want it to happen now.</span> marker<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">true</span>); <span class="comment">// Dim the marker, if series is not visible</span> <span class="type">qreal</span> alpha <span class="operator">=</span> <span class="number">1.0</span>; <span class="keyword">if</span> (<span class="operator">!</span>marker<span class="operator">-</span><span class="operator">></span>series()<span class="operator">-</span><span class="operator">></span>isVisible()) alpha <span class="operator">=</span> <span class="number">0.5</span>; <span class="type">QColor</span> color; <span class="type">QBrush</span> brush <span class="operator">=</span> marker<span class="operator">-</span><span class="operator">></span>labelBrush(); color <span class="operator">=</span> brush<span class="operator">.</span>color(); color<span class="operator">.</span>setAlphaF(alpha); brush<span class="operator">.</span>setColor(color); marker<span class="operator">-</span><span class="operator">></span>setLabelBrush(brush); brush <span class="operator">=</span> marker<span class="operator">-</span><span class="operator">></span>brush(); color <span class="operator">=</span> brush<span class="operator">.</span>color(); color<span class="operator">.</span>setAlphaF(alpha); brush<span class="operator">.</span>setColor(color); marker<span class="operator">-</span><span class="operator">></span>setBrush(brush); <span class="type">QPen</span> pen <span class="operator">=</span> marker<span class="operator">-</span><span class="operator">></span>pen(); color <span class="operator">=</span> pen<span class="operator">.</span>color(); color<span class="operator">.</span>setAlphaF(alpha); pen<span class="operator">.</span>setColor(color); marker<span class="operator">-</span><span class="operator">></span>setPen(pen); <span class="keyword">break</span>; } <span class="keyword">default</span>: { qDebug() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Unknown marker type"</span>; <span class="keyword">break</span>; } } } </pre> </div> <!-- @@@legendmarkers/mainwidget.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>