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<h1 class="title">datasource.cpp Example File</h1>
<span class="subtitle">openglseries/datasource.cpp</span>
<!-- $$$openglseries/datasource.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 "datasource.h"</span>
<span class="preprocessor">#include <QtCore/QtMath></span>
QT_CHARTS_USE_NAMESPACE
DataSource<span class="operator">::</span>DataSource(<span class="type">QObject</span> <span class="operator">*</span>parent) :
<span class="type">QObject</span>(parent)<span class="operator">,</span>
m_index(<span class="operator">-</span><span class="number">1</span>)
{
generateData(<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="type">void</span> DataSource<span class="operator">::</span>update(<span class="type"><a href="qabstractseries.html">QAbstractSeries</a></span> <span class="operator">*</span>series<span class="operator">,</span> <span class="type">int</span> seriesIndex)
{
<span class="keyword">if</span> (series) {
<span class="type"><a href="qxyseries.html">QXYSeries</a></span> <span class="operator">*</span>xySeries <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qxyseries.html">QXYSeries</a></span> <span class="operator">*</span><span class="operator">></span>(series);
<span class="keyword">const</span> <span class="type">QVector</span><span class="operator"><</span><span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> <span class="operator">></span> <span class="operator">&</span>seriesData <span class="operator">=</span> m_data<span class="operator">.</span>at(seriesIndex);
<span class="keyword">if</span> (seriesIndex <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
m_index<span class="operator">+</span><span class="operator">+</span>;
<span class="keyword">if</span> (m_index <span class="operator">></span> seriesData<span class="operator">.</span>count() <span class="operator">-</span> <span class="number">1</span>)
m_index <span class="operator">=</span> <span class="number">0</span>;
<span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> points <span class="operator">=</span> seriesData<span class="operator">.</span>at(m_index);
<span class="comment">// Use replace instead of clear + append, it's optimized for performance</span>
xySeries<span class="operator">-</span><span class="operator">></span>replace(points);
}
}
<span class="type">void</span> DataSource<span class="operator">::</span>handleSceneChanged()
{
m_dataUpdater<span class="operator">.</span>start();
}
<span class="type">void</span> DataSource<span class="operator">::</span>updateAllSeries()
{
<span class="keyword">static</span> <span class="type">int</span> frameCount <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">static</span> <span class="type">QString</span> labelText <span class="operator">=</span> <span class="type">QStringLiteral</span>(<span class="string">"FPS: %1"</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_seriesList<span class="operator">.</span>size(); i<span class="operator">+</span><span class="operator">+</span>)
update(m_seriesList<span class="operator">[</span>i<span class="operator">]</span><span class="operator">,</span> i);
frameCount<span class="operator">+</span><span class="operator">+</span>;
<span class="type">int</span> elapsed <span class="operator">=</span> m_fpsTimer<span class="operator">.</span>elapsed();
<span class="keyword">if</span> (elapsed <span class="operator">></span><span class="operator">=</span> <span class="number">1000</span>) {
elapsed <span class="operator">=</span> m_fpsTimer<span class="operator">.</span>restart();
<span class="type">qreal</span> fps <span class="operator">=</span> <span class="type">qreal</span>(<span class="number">0.1</span> <span class="operator">*</span> <span class="type">int</span>(<span class="number">10000.0</span> <span class="operator">*</span> (<span class="type">qreal</span>(frameCount) <span class="operator">/</span> <span class="type">qreal</span>(elapsed))));
m_fpsLabel<span class="operator">-</span><span class="operator">></span>setText(labelText<span class="operator">.</span>arg(<span class="type">QString</span><span class="operator">::</span>number(fps<span class="operator">,</span> <span class="char">'f'</span><span class="operator">,</span> <span class="number">1</span>)));
m_fpsLabel<span class="operator">-</span><span class="operator">></span>adjustSize();
frameCount <span class="operator">=</span> <span class="number">0</span>;
}
}
<span class="type">void</span> DataSource<span class="operator">::</span>startUpdates(<span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qxyseries.html">QXYSeries</a></span> <span class="operator">*</span><span class="operator">></span> <span class="operator">&</span>seriesList<span class="operator">,</span> <span class="type">QLabel</span> <span class="operator">*</span>fpsLabel)
{
m_seriesList <span class="operator">=</span> seriesList;
m_fpsLabel <span class="operator">=</span> fpsLabel;
m_dataUpdater<span class="operator">.</span>setInterval(<span class="number">0</span>);
m_dataUpdater<span class="operator">.</span>setSingleShot(<span class="keyword">true</span>);
<span class="type">QObject</span><span class="operator">::</span>connect(<span class="operator">&</span>m_dataUpdater<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>DataSource<span class="operator">::</span>updateAllSeries);
m_fpsTimer<span class="operator">.</span>start();
updateAllSeries();
}
<span class="type">void</span> DataSource<span class="operator">::</span>generateData(<span class="type">int</span> seriesCount<span class="operator">,</span> <span class="type">int</span> rowCount<span class="operator">,</span> <span class="type">int</span> colCount)
{
m_data<span class="operator">.</span>clear();
<span class="type">qreal</span> xAdjustment <span class="operator">=</span> <span class="number">20.0</span> <span class="operator">/</span> (colCount <span class="operator">*</span> rowCount);
<span class="type">qreal</span> yMultiplier <span class="operator">=</span> <span class="number">3.0</span> <span class="operator">/</span> <span class="type">qreal</span>(seriesCount);
<span class="comment">// Append the new data depending on the type</span>
<span class="keyword">for</span> (<span class="type">int</span> k(<span class="number">0</span>); k <span class="operator"><</span> seriesCount; k<span class="operator">+</span><span class="operator">+</span>) {
<span class="type">QVector</span><span class="operator"><</span><span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> <span class="operator">></span> seriesData;
<span class="type">qreal</span> height <span class="operator">=</span> <span class="type">qreal</span>(k) <span class="operator">*</span> (<span class="number">10.0</span> <span class="operator">/</span> <span class="type">qreal</span>(seriesCount)) <span class="operator">+</span> <span class="number">0.3</span>;
<span class="keyword">for</span> (<span class="type">int</span> i(<span class="number">0</span>); i <span class="operator"><</span> rowCount; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> points;
points<span class="operator">.</span>reserve(colCount);
<span class="keyword">for</span> (<span class="type">int</span> j(<span class="number">0</span>); j <span class="operator"><</span> colCount; j<span class="operator">+</span><span class="operator">+</span>) {
<span class="type">qreal</span> x(<span class="number">0</span>);
<span class="type">qreal</span> y(<span class="number">0</span>);
<span class="comment">// data with sin + random component</span>
y <span class="operator">=</span> height <span class="operator">+</span> (yMultiplier <span class="operator">*</span> qSin(<span class="number">3.14159265358979</span> <span class="operator">/</span> <span class="number">50</span> <span class="operator">*</span> j)
<span class="operator">+</span> (yMultiplier <span class="operator">*</span> (<span class="type">qreal</span>) rand() <span class="operator">/</span> (<span class="type">qreal</span>) RAND_MAX));
<span class="comment">// 0.000001 added to make values logaxis compatible</span>
x <span class="operator">=</span> <span class="number">0.000001</span> <span class="operator">+</span> <span class="number">20.0</span> <span class="operator">*</span> (<span class="type">qreal</span>(j) <span class="operator">/</span> <span class="type">qreal</span>(colCount)) <span class="operator">+</span> (xAdjustment <span class="operator">*</span> <span class="type">qreal</span>(i));
points<span class="operator">.</span>append(<span class="type">QPointF</span>(x<span class="operator">,</span> y));
}
seriesData<span class="operator">.</span>append(points);
}
m_data<span class="operator">.</span>append(seriesData);
}
}
</pre>
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<!-- @@@openglseries/datasource.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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distrib
>
Mageia
>
6
>
x86_64
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media
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core-updates
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by-pkgid
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19952c5e751bf7e3108c3c59625b0f35
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files
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367
