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<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>
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<!-- @@@nesteddonuts/widget.cpp -->
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<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
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Mageia
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6
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x86_64
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media
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19952c5e751bf7e3108c3c59625b0f35
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