<?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>widget.cpp Example File | Qt Charts 5.9</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 5.9</td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-nesteddonuts-example.html">Nested Donuts Example</a></td><td >widget.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 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">widget.cpp Example File</h1> <span class="subtitle">nesteddonuts/widget.cpp</span> <!-- $$$nesteddonuts/widget.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 "widget.h"</span> <span class="preprocessor">#include <QtCharts/QChartView></span> <span class="preprocessor">#include <QtCharts/QChart></span> <span class="preprocessor">#include <QtCharts/QLegend></span> <span class="preprocessor">#include <QtCharts/QPieSeries></span> <span class="preprocessor">#include <QtCharts/QPieSlice></span> <span class="preprocessor">#include <QtCore/QTime></span> <span class="preprocessor">#include <QtWidgets/QGridLayout></span> <span class="preprocessor">#include <QtCore/QTimer></span> QT_CHARTS_USE_NAMESPACE Widget<span class="operator">::</span>Widget(<span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type">QWidget</span>(parent) { setMinimumSize(<span class="number">800</span><span class="operator">,</span> <span class="number">600</span>); qsrand(<span class="type">QTime</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">.</span>secsTo(<span class="type">QTime</span><span class="operator">::</span>currentTime())); <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>; chartView<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing); <span class="type"><a href="qchart.html">QChart</a></span> <span class="operator">*</span>chart <span class="operator">=</span> chartView<span class="operator">-</span><span class="operator">></span>chart(); chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">false</span>); chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Nested donuts demo"</span>); chart<span class="operator">-</span><span class="operator">></span>setAnimationOptions(<span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>AllAnimations); <span class="type">qreal</span> minSize <span class="operator">=</span> <span class="number">0.1</span>; <span class="type">qreal</span> maxSize <span class="operator">=</span> <span class="number">0.9</span>; <span class="type">int</span> donutCount <span class="operator">=</span> <span class="number">5</span>; <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> donutCount; i<span class="operator">+</span><span class="operator">+</span>) { <span class="type"><a href="qpieseries.html">QPieSeries</a></span> <span class="operator">*</span>donut <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpieseries.html">QPieSeries</a></span>; <span class="type">int</span> sliceCount <span class="operator">=</span> <span class="number">3</span> <span class="operator">+</span> qrand() <span class="operator">%</span> <span class="number">3</span>; <span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator"><</span> sliceCount; j<span class="operator">+</span><span class="operator">+</span>) { <span class="type">qreal</span> value <span class="operator">=</span> <span class="number">100</span> <span class="operator">+</span> qrand() <span class="operator">%</span> <span class="number">100</span>; <span class="type"><a href="qpieslice.html">QPieSlice</a></span> <span class="operator">*</span>slice <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpieslice.html">QPieSlice</a></span>(<span class="type">QString</span>(<span class="string">"%1"</span>)<span class="operator">.</span>arg(value)<span class="operator">,</span> value); slice<span class="operator">-</span><span class="operator">></span>setLabelVisible(<span class="keyword">true</span>); slice<span class="operator">-</span><span class="operator">></span>setLabelColor(<span class="type">Qt</span><span class="operator">::</span>white); slice<span class="operator">-</span><span class="operator">></span>setLabelPosition(<span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>LabelInsideTangential); connect(slice<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qpieslice.html">QPieSlice</a></span><span class="operator">::</span>hovered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Widget<span class="operator">::</span>explodeSlice); donut<span class="operator">-</span><span class="operator">></span>append(slice); donut<span class="operator">-</span><span class="operator">></span>setHoleSize(minSize <span class="operator">+</span> i <span class="operator">*</span> (maxSize <span class="operator">-</span> minSize) <span class="operator">/</span> donutCount); donut<span class="operator">-</span><span class="operator">></span>setPieSize(minSize <span class="operator">+</span> (i <span class="operator">+</span> <span class="number">1</span>) <span class="operator">*</span> (maxSize <span class="operator">-</span> minSize) <span class="operator">/</span> donutCount); } m_donuts<span class="operator">.</span>append(donut); chartView<span class="operator">-</span><span class="operator">></span>chart()<span class="operator">-</span><span class="operator">></span>addSeries(donut); } <span class="comment">// create main layout</span> <span class="type">QGridLayout</span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGridLayout</span>; mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(chartView<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>); setLayout(mainLayout); updateTimer <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QTimer</span>(<span class="keyword">this</span>); connect(updateTimer<span class="operator">,</span> <span class="operator">&</span><span class="type">QTimer</span><span class="operator">::</span>timeout<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Widget<span class="operator">::</span>updateRotation); updateTimer<span class="operator">-</span><span class="operator">></span>start(<span class="number">1250</span>); } Widget<span class="operator">::</span><span class="operator">~</span>Widget() { } <span class="type">void</span> Widget<span class="operator">::</span>updateRotation() { <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> m_donuts<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>) { <span class="type"><a href="qpieseries.html">QPieSeries</a></span> <span class="operator">*</span>donut <span class="operator">=</span> m_donuts<span class="operator">.</span>at(i); <span class="type">qreal</span> phaseShift <span class="operator">=</span> <span class="operator">-</span><span class="number">50</span> <span class="operator">+</span> qrand() <span class="operator">%</span> <span class="number">100</span>; donut<span class="operator">-</span><span class="operator">></span>setPieStartAngle(donut<span class="operator">-</span><span class="operator">></span>pieStartAngle() <span class="operator">+</span> phaseShift); donut<span class="operator">-</span><span class="operator">></span>setPieEndAngle(donut<span class="operator">-</span><span class="operator">></span>pieEndAngle() <span class="operator">+</span> phaseShift); } } <span class="type">void</span> Widget<span class="operator">::</span>explodeSlice(bool exploded) { <span class="type"><a href="qpieslice.html">QPieSlice</a></span> <span class="operator">*</span>slice <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qpieslice.html">QPieSlice</a></span> <span class="operator">*</span><span class="operator">></span>(sender()); <span class="keyword">if</span> (exploded) { updateTimer<span class="operator">-</span><span class="operator">></span>stop(); <span class="type">qreal</span> sliceStartAngle <span class="operator">=</span> slice<span class="operator">-</span><span class="operator">></span>startAngle(); <span class="type">qreal</span> sliceEndAngle <span class="operator">=</span> slice<span class="operator">-</span><span class="operator">></span>startAngle() <span class="operator">+</span> slice<span class="operator">-</span><span class="operator">></span>angleSpan(); <span class="type"><a href="qpieseries.html">QPieSeries</a></span> <span class="operator">*</span>donut <span class="operator">=</span> slice<span class="operator">-</span><span class="operator">></span>series(); <span class="type">qreal</span> seriesIndex <span class="operator">=</span> m_donuts<span class="operator">.</span>indexOf(donut); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> seriesIndex <span class="operator">+</span> <span class="number">1</span>; i <span class="operator"><</span> m_donuts<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>) { m_donuts<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">></span>setPieStartAngle(sliceEndAngle); m_donuts<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">></span>setPieEndAngle(<span class="number">360</span> <span class="operator">+</span> sliceStartAngle); } } <span class="keyword">else</span> { <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> m_donuts<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>) { m_donuts<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">></span>setPieStartAngle(<span class="number">0</span>); m_donuts<span class="operator">.</span>at(i)<span class="operator">-</span><span class="operator">></span>setPieEndAngle(<span class="number">360</span>); } updateTimer<span class="operator">-</span><span class="operator">></span>start(); } slice<span class="operator">-</span><span class="operator">></span>setExploded(exploded); } </pre> </div> <!-- @@@nesteddonuts/widget.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 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>