<?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>donutbreakdownchart.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-donutbreakdown-example.html">Donut Chart Breakdown Example</a></td><td >donutbreakdownchart.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">donutbreakdownchart.cpp Example File</h1> <span class="subtitle">donutbreakdown/donutbreakdownchart.cpp</span> <!-- $$$donutbreakdown/donutbreakdownchart.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 "donutbreakdownchart.h"</span> <span class="preprocessor">#include "mainslice.h"</span> <span class="preprocessor">#include <QtCharts/QPieSlice></span> <span class="preprocessor">#include <QtCharts/QPieLegendMarker></span> QT_CHARTS_USE_NAMESPACE DonutBreakdownChart<span class="operator">::</span>DonutBreakdownChart(<span class="type">QGraphicsItem</span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>WindowFlags wFlags) : <span class="type"><a href="qchart.html">QChart</a></span>(<span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartTypeCartesian<span class="operator">,</span> parent<span class="operator">,</span> wFlags) { <span class="comment">// create the series for main center pie</span> m_mainSeries <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpieseries.html">QPieSeries</a></span>(); m_mainSeries<span class="operator">-</span><span class="operator">></span>setPieSize(<span class="number">0.7</span>); <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>addSeries(m_mainSeries); } <span class="type">void</span> DonutBreakdownChart<span class="operator">::</span>addBreakdownSeries(<span class="type"><a href="qpieseries.html">QPieSeries</a></span> <span class="operator">*</span>breakdownSeries<span class="operator">,</span> <span class="type">QColor</span> color) { <span class="type">QFont</span> font(<span class="string">"Arial"</span><span class="operator">,</span> <span class="number">8</span>); <span class="comment">// add breakdown series as a slice to center pie</span> MainSlice <span class="operator">*</span>mainSlice <span class="operator">=</span> <span class="keyword">new</span> MainSlice(breakdownSeries); mainSlice<span class="operator">-</span><span class="operator">></span>setName(breakdownSeries<span class="operator">-</span><span class="operator">></span>name()); mainSlice<span class="operator">-</span><span class="operator">></span>setValue(breakdownSeries<span class="operator">-</span><span class="operator">></span>sum()); m_mainSeries<span class="operator">-</span><span class="operator">></span>append(mainSlice); <span class="comment">// customize the slice</span> mainSlice<span class="operator">-</span><span class="operator">></span>setBrush(color); mainSlice<span class="operator">-</span><span class="operator">></span>setLabelVisible(); mainSlice<span class="operator">-</span><span class="operator">></span>setLabelColor(<span class="type">Qt</span><span class="operator">::</span>white); mainSlice<span class="operator">-</span><span class="operator">></span>setLabelPosition(<span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>LabelInsideHorizontal); mainSlice<span class="operator">-</span><span class="operator">></span>setLabelFont(font); <span class="comment">// position and customize the breakdown series</span> breakdownSeries<span class="operator">-</span><span class="operator">></span>setPieSize(<span class="number">0.8</span>); breakdownSeries<span class="operator">-</span><span class="operator">></span>setHoleSize(<span class="number">0.7</span>); breakdownSeries<span class="operator">-</span><span class="operator">></span>setLabelsVisible(); <span class="keyword">const</span> <span class="keyword">auto</span> slices <span class="operator">=</span> breakdownSeries<span class="operator">-</span><span class="operator">></span>slices(); <span class="keyword">for</span> (<span class="type"><a href="qpieslice.html">QPieSlice</a></span> <span class="operator">*</span>slice : slices) { color <span class="operator">=</span> color<span class="operator">.</span>lighter(<span class="number">115</span>); slice<span class="operator">-</span><span class="operator">></span>setBrush(color); slice<span class="operator">-</span><span class="operator">></span>setLabelFont(font); } <span class="comment">// add the series to the chart</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>addSeries(breakdownSeries); <span class="comment">// recalculate breakdown donut segments</span> recalculateAngles(); <span class="comment">// update customize legend markers</span> updateLegendMarkers(); } <span class="type">void</span> DonutBreakdownChart<span class="operator">::</span>recalculateAngles() { <span class="type">qreal</span> angle <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">const</span> <span class="keyword">auto</span> slices <span class="operator">=</span> m_mainSeries<span class="operator">-</span><span class="operator">></span>slices(); <span class="keyword">for</span> (<span class="type"><a href="qpieslice.html">QPieSlice</a></span> <span class="operator">*</span>slice : slices) { <span class="type"><a href="qpieseries.html">QPieSeries</a></span> <span class="operator">*</span>breakdownSeries <span class="operator">=</span> qobject_cast<span class="operator"><</span>MainSlice <span class="operator">*</span><span class="operator">></span>(slice)<span class="operator">-</span><span class="operator">></span>breakdownSeries(); breakdownSeries<span class="operator">-</span><span class="operator">></span>setPieStartAngle(angle); angle <span class="operator">+</span><span class="operator">=</span> slice<span class="operator">-</span><span class="operator">></span>percentage() <span class="operator">*</span> <span class="number">360.0</span>; <span class="comment">// full pie is 360.0</span> breakdownSeries<span class="operator">-</span><span class="operator">></span>setPieEndAngle(angle); } } <span class="type">void</span> DonutBreakdownChart<span class="operator">::</span>updateLegendMarkers() { <span class="comment">// go through all markers</span> <span class="keyword">const</span> <span class="keyword">auto</span> allseries <span class="operator">=</span> series(); <span class="keyword">for</span> (<span class="type"><a href="qabstractseries.html">QAbstractSeries</a></span> <span class="operator">*</span>series : allseries) { <span class="keyword">const</span> <span class="keyword">auto</span> markers <span class="operator">=</span> legend()<span class="operator">-</span><span class="operator">></span>markers(series); <span class="keyword">for</span> (<span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span> <span class="operator">*</span>marker : markers) { <span class="type"><a href="qpielegendmarker.html">QPieLegendMarker</a></span> <span class="operator">*</span>pieMarker <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qpielegendmarker.html">QPieLegendMarker</a></span> <span class="operator">*</span><span class="operator">></span>(marker); <span class="keyword">if</span> (series <span class="operator">=</span><span class="operator">=</span> m_mainSeries) { <span class="comment">// hide markers from main series</span> pieMarker<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">false</span>); } <span class="keyword">else</span> { <span class="comment">// modify markers from breakdown series</span> pieMarker<span class="operator">-</span><span class="operator">></span>setLabel(<span class="type">QString</span>(<span class="string">"%1 %2%"</span>) <span class="operator">.</span>arg(pieMarker<span class="operator">-</span><span class="operator">></span>slice()<span class="operator">-</span><span class="operator">></span>label()) <span class="operator">.</span>arg(pieMarker<span class="operator">-</span><span class="operator">></span>slice()<span class="operator">-</span><span class="operator">></span>percentage() <span class="operator">*</span> <span class="number">100</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="char">'f'</span><span class="operator">,</span> <span class="number">2</span>)); pieMarker<span class="operator">-</span><span class="operator">></span>setFont(<span class="type">QFont</span>(<span class="string">"Arial"</span><span class="operator">,</span> <span class="number">8</span>)); } } } } </pre> </div> <!-- @@@donutbreakdown/donutbreakdownchart.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. 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