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<h1 class="title">datasource.cpp Example File</h1>
<span class="subtitle">qmloscilloscope/datasource.cpp</span>
<!-- $$$qmloscilloscope/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 Data Visualization 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/qmath.h></span>
<span class="preprocessor">#include <QtCore/qrandom.h></span>
<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="type"><a href="qtdatavisualization-qmlmodule.html">QtDataVisualization</a></span>;
Q_DECLARE_METATYPE(QSurface3DSeries <span class="operator">*</span>)
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>)<span class="operator">,</span>
m_resetArray(nullptr)
{
qRegisterMetaType<span class="operator"><</span>QSurface3DSeries <span class="operator">*</span><span class="operator">></span>();
}
DataSource<span class="operator">::</span><span class="operator">~</span>DataSource()
{
clearData();
}
<span class="type">void</span> DataSource<span class="operator">::</span>generateData(<span class="type">int</span> cacheCount<span class="operator">,</span> <span class="type">int</span> rowCount<span class="operator">,</span> <span class="type">int</span> columnCount<span class="operator">,</span>
<span class="type">float</span> xMin<span class="operator">,</span> <span class="type">float</span> xMax<span class="operator">,</span> <span class="type">float</span> yMin<span class="operator">,</span> <span class="type">float</span> yMax<span class="operator">,</span>
<span class="type">float</span> zMin<span class="operator">,</span> <span class="type">float</span> zMax)
{
<span class="keyword">if</span> (<span class="operator">!</span>cacheCount <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>rowCount <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>columnCount)
<span class="keyword">return</span>;
clearData();
<span class="comment">// Re-create the cache array</span>
m_data<span class="operator">.</span>resize(cacheCount);
<span class="keyword">for</span> (<span class="type">int</span> i(<span class="number">0</span>); i <span class="operator"><</span> cacheCount; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataArray-typedef">QSurfaceDataArray</a></span> <span class="operator">&</span>array <span class="operator">=</span> m_data<span class="operator">[</span>i<span class="operator">]</span>;
array<span class="operator">.</span>reserve(rowCount);
<span class="keyword">for</span> (<span class="type">int</span> j(<span class="number">0</span>); j <span class="operator"><</span> rowCount; j<span class="operator">+</span><span class="operator">+</span>)
array<span class="operator">.</span>append(<span class="keyword">new</span> <span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataRow-typedef">QSurfaceDataRow</a></span>(columnCount));
}
<span class="type">float</span> xRange <span class="operator">=</span> xMax <span class="operator">-</span> xMin;
<span class="type">float</span> yRange <span class="operator">=</span> yMax <span class="operator">-</span> yMin;
<span class="type">float</span> zRange <span class="operator">=</span> zMax <span class="operator">-</span> zMin;
<span class="type">int</span> cacheIndexStep <span class="operator">=</span> columnCount <span class="operator">/</span> cacheCount;
<span class="type">float</span> cacheStep <span class="operator">=</span> <span class="type">float</span>(cacheIndexStep) <span class="operator">*</span> xRange <span class="operator">/</span> <span class="type">float</span>(columnCount);
<span class="comment">// Populate caches</span>
<span class="keyword">for</span> (<span class="type">int</span> i(<span class="number">0</span>); i <span class="operator"><</span> cacheCount; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataArray-typedef">QSurfaceDataArray</a></span> <span class="operator">&</span>cache <span class="operator">=</span> m_data<span class="operator">[</span>i<span class="operator">]</span>;
<span class="type">float</span> cacheXAdjustment <span class="operator">=</span> cacheStep <span class="operator">*</span> i;
<span class="type">float</span> cacheIndexAdjustment <span class="operator">=</span> cacheIndexStep <span class="operator">*</span> i;
<span class="keyword">for</span> (<span class="type">int</span> j(<span class="number">0</span>); j <span class="operator"><</span> rowCount; j<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataRow-typedef">QSurfaceDataRow</a></span> <span class="operator">&</span>row <span class="operator">=</span> <span class="operator">*</span>(cache<span class="operator">[</span>j<span class="operator">]</span>);
<span class="type">float</span> rowMod <span class="operator">=</span> (<span class="type">float</span>(j)) <span class="operator">/</span> <span class="type">float</span>(rowCount);
<span class="type">float</span> yRangeMod <span class="operator">=</span> yRange <span class="operator">*</span> rowMod;
<span class="type">float</span> zRangeMod <span class="operator">=</span> zRange <span class="operator">*</span> rowMod;
<span class="type">float</span> z <span class="operator">=</span> zRangeMod <span class="operator">+</span> zMin;
<span class="type">qreal</span> rowColWaveAngleMul <span class="operator">=</span> M_PI <span class="operator">*</span> M_PI <span class="operator">*</span> rowMod;
<span class="type">float</span> rowColWaveMul <span class="operator">=</span> yRangeMod <span class="operator">*</span> <span class="number">0.2f</span>;
<span class="keyword">for</span> (<span class="type">int</span> k(<span class="number">0</span>); k <span class="operator"><</span> columnCount; k<span class="operator">+</span><span class="operator">+</span>) {
<span class="type">float</span> colMod <span class="operator">=</span> (<span class="type">float</span>(k)) <span class="operator">/</span> <span class="type">float</span>(columnCount);
<span class="type">float</span> xRangeMod <span class="operator">=</span> xRange <span class="operator">*</span> colMod;
<span class="type">float</span> x <span class="operator">=</span> xRangeMod <span class="operator">+</span> xMin <span class="operator">+</span> cacheXAdjustment;
<span class="type">float</span> colWave <span class="operator">=</span> <span class="type">float</span>(qSin((<span class="number">2.0</span> <span class="operator">*</span> M_PI <span class="operator">*</span> colMod) <span class="operator">-</span> (<span class="number">1.0</span> <span class="operator">/</span> <span class="number">2.0</span> <span class="operator">*</span> M_PI)) <span class="operator">+</span> <span class="number">1.0</span>);
<span class="type">float</span> y <span class="operator">=</span> (colWave <span class="operator">*</span> ((<span class="type">float</span>(qSin(rowColWaveAngleMul <span class="operator">*</span> colMod) <span class="operator">+</span> <span class="number">1.0</span>))))
<span class="operator">*</span> rowColWaveMul
<span class="operator">+</span> <span class="type">QRandomGenerator</span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">></span>bounded(<span class="number">0.15f</span>) <span class="operator">*</span> yRangeMod;
<span class="type">int</span> index <span class="operator">=</span> k <span class="operator">+</span> cacheIndexAdjustment;
<span class="keyword">if</span> (index <span class="operator">></span><span class="operator">=</span> columnCount) {
<span class="comment">// Wrap over</span>
index <span class="operator">-</span><span class="operator">=</span> columnCount;
x <span class="operator">-</span><span class="operator">=</span> xRange;
}
row<span class="operator">[</span>index<span class="operator">]</span> <span class="operator">=</span> QVector3D(x<span class="operator">,</span> y<span class="operator">,</span> z);
}
}
}
}
<span class="type">void</span> DataSource<span class="operator">::</span>update(QSurface3DSeries <span class="operator">*</span>series)
{
<span class="keyword">if</span> (series <span class="operator">&</span><span class="operator">&</span> m_data<span class="operator">.</span>size()) {
<span class="comment">// Each iteration uses data from a different cached array</span>
m_index<span class="operator">+</span><span class="operator">+</span>;
<span class="keyword">if</span> (m_index <span class="operator">></span> m_data<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"><a href="qsurfacedataproxy.html#QSurfaceDataArray-typedef">QSurfaceDataArray</a></span> array <span class="operator">=</span> m_data<span class="operator">.</span>at(m_index);
<span class="type">int</span> newRowCount <span class="operator">=</span> array<span class="operator">.</span>size();
<span class="type">int</span> newColumnCount <span class="operator">=</span> array<span class="operator">.</span>at(<span class="number">0</span>)<span class="operator">-</span><span class="operator">></span>size();
<span class="comment">// If the first time or the dimensions of the cache array have changed,</span>
<span class="comment">// reconstruct the reset array</span>
<span class="keyword">if</span> (<span class="operator">!</span>m_resetArray <span class="operator">|</span><span class="operator">|</span> series<span class="operator">-</span><span class="operator">></span>dataProxy()<span class="operator">-</span><span class="operator">></span>rowCount() <span class="operator">!</span><span class="operator">=</span> newRowCount
<span class="operator">|</span><span class="operator">|</span> series<span class="operator">-</span><span class="operator">></span>dataProxy()<span class="operator">-</span><span class="operator">></span>columnCount() <span class="operator">!</span><span class="operator">=</span> newColumnCount) {
m_resetArray <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataArray-typedef">QSurfaceDataArray</a></span>();
m_resetArray<span class="operator">-</span><span class="operator">></span>reserve(newRowCount);
<span class="keyword">for</span> (<span class="type">int</span> i(<span class="number">0</span>); i <span class="operator"><</span> newRowCount; i<span class="operator">+</span><span class="operator">+</span>)
m_resetArray<span class="operator">-</span><span class="operator">></span>append(<span class="keyword">new</span> <span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataRow-typedef">QSurfaceDataRow</a></span>(newColumnCount));
}
<span class="comment">// Copy items from our cache to the reset array</span>
<span class="keyword">for</span> (<span class="type">int</span> i(<span class="number">0</span>); i <span class="operator"><</span> newRowCount; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="keyword">const</span> <span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataRow-typedef">QSurfaceDataRow</a></span> <span class="operator">&</span>sourceRow <span class="operator">=</span> <span class="operator">*</span>(array<span class="operator">.</span>at(i));
<span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataRow-typedef">QSurfaceDataRow</a></span> <span class="operator">&</span>row <span class="operator">=</span> <span class="operator">*</span>(<span class="operator">*</span>m_resetArray)<span class="operator">[</span>i<span class="operator">]</span>;
<span class="keyword">for</span> (<span class="type">int</span> j(<span class="number">0</span>); j <span class="operator"><</span> newColumnCount; j<span class="operator">+</span><span class="operator">+</span>)
row<span class="operator">[</span>j<span class="operator">]</span><span class="operator">.</span>setPosition(sourceRow<span class="operator">.</span>at(j)<span class="operator">.</span>position());
}
<span class="comment">// Notify the proxy that data has changed</span>
series<span class="operator">-</span><span class="operator">></span>dataProxy()<span class="operator">-</span><span class="operator">></span>resetArray(m_resetArray);
}
}
<span class="type">void</span> DataSource<span class="operator">::</span>clearData()
{
<span class="keyword">for</span> (<span class="type">int</span> i(<span class="number">0</span>); i <span class="operator"><</span> m_data<span class="operator">.</span>size(); i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type"><a href="qsurfacedataproxy.html#QSurfaceDataArray-typedef">QSurfaceDataArray</a></span> <span class="operator">&</span>array <span class="operator">=</span> m_data<span class="operator">[</span>i<span class="operator">]</span>;
<span class="keyword">for</span> (<span class="type">int</span> j(<span class="number">0</span>); j <span class="operator"><</span> array<span class="operator">.</span>size(); j<span class="operator">+</span><span class="operator">+</span>)
<span class="keyword">delete</span> array<span class="operator">[</span>j<span class="operator">]</span>;
array<span class="operator">.</span>clear();
}
}
</pre>
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<!-- @@@qmloscilloscope/datasource.cpp -->
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