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<h1 class="title">scatterdatamodifier.cpp Example File</h1>
<span class="subtitle">rotations/scatterdatamodifier.cpp</span>
<!-- $$$rotations/scatterdatamodifier.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 "scatterdatamodifier.h"</span>
<span class="preprocessor">#include <QtDataVisualization/qscatterdataproxy.h></span>
<span class="preprocessor">#include <QtDataVisualization/qvalue3daxis.h></span>
<span class="preprocessor">#include <QtDataVisualization/q3dscene.h></span>
<span class="preprocessor">#include <QtDataVisualization/q3dcamera.h></span>
<span class="preprocessor">#include <QtDataVisualization/qscatter3dseries.h></span>
<span class="preprocessor">#include <QtDataVisualization/q3dtheme.h></span>
<span class="preprocessor">#include <QtDataVisualization/QCustom3DItem></span>
<span class="preprocessor">#include <QtCore/qmath.h></span>
<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="type"><a href="qtdatavisualization-qmlmodule.html">QtDataVisualization</a></span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">float</span> verticalRange <span class="operator">=</span> <span class="number">8.0f</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">float</span> horizontalRange <span class="operator">=</span> verticalRange;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">float</span> ellipse_a <span class="operator">=</span> horizontalRange <span class="operator">/</span> <span class="number">3.0f</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">float</span> ellipse_b <span class="operator">=</span> verticalRange;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">float</span> doublePi <span class="operator">=</span> <span class="type">float</span>(M_PI) <span class="operator">*</span> <span class="number">2.0f</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">float</span> radiansToDegrees <span class="operator">=</span> <span class="number">360.0f</span> <span class="operator">/</span> doublePi;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">float</span> animationFrames <span class="operator">=</span> <span class="number">30.0f</span>;
ScatterDataModifier<span class="operator">::</span>ScatterDataModifier(<span class="type"><a href="q3dscatter.html">Q3DScatter</a></span> <span class="operator">*</span>scatter)
: m_graph(scatter)<span class="operator">,</span>
m_fieldLines(<span class="number">12</span>)<span class="operator">,</span>
m_arrowsPerLine(<span class="number">16</span>)<span class="operator">,</span>
m_magneticField(<span class="keyword">new</span> QScatter3DSeries)<span class="operator">,</span>
m_sun(<span class="keyword">new</span> QCustom3DItem)<span class="operator">,</span>
m_magneticFieldArray(<span class="number">0</span>)<span class="operator">,</span>
m_angleOffset(<span class="number">0.0f</span>)<span class="operator">,</span>
m_angleStep(doublePi <span class="operator">/</span> m_arrowsPerLine <span class="operator">/</span> animationFrames)
{
m_graph<span class="operator">-</span><span class="operator">></span>setShadowQuality(QAbstract3DGraph<span class="operator">::</span>ShadowQualityNone);
m_graph<span class="operator">-</span><span class="operator">></span>scene()<span class="operator">-</span><span class="operator">></span>activeCamera()<span class="operator">-</span><span class="operator">></span>setCameraPreset(<span class="type"><a href="q3dcamera.html">Q3DCamera</a></span><span class="operator">::</span>CameraPresetFront);
<span class="comment">// Magnetic field lines use custom narrow arrow</span>
m_magneticField<span class="operator">-</span><span class="operator">></span>setItemSize(<span class="number">0.2f</span>);
m_magneticField<span class="operator">-</span><span class="operator">></span>setMesh(QAbstract3DSeries<span class="operator">::</span>MeshUserDefined);
m_magneticField<span class="operator">-</span><span class="operator">></span>setUserDefinedMesh(<span class="type">QStringLiteral</span>(<span class="string">":/mesh/narrowarrow.obj"</span>));
<span class="type">QLinearGradient</span> fieldGradient(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> <span class="number">1024</span>);
fieldGradient<span class="operator">.</span>setColorAt(<span class="number">0.0</span><span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>black);
fieldGradient<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>white);
m_magneticField<span class="operator">-</span><span class="operator">></span>setBaseGradient(fieldGradient);
m_magneticField<span class="operator">-</span><span class="operator">></span>setColorStyle(<span class="type"><a href="q3dtheme.html">Q3DTheme</a></span><span class="operator">::</span>ColorStyleRangeGradient);
<span class="comment">// For 'sun' we use a custom large sphere</span>
m_sun<span class="operator">-</span><span class="operator">></span>setScaling(QVector3D(<span class="number">0.07f</span><span class="operator">,</span> <span class="number">0.07f</span><span class="operator">,</span> <span class="number">0.07f</span>));
m_sun<span class="operator">-</span><span class="operator">></span>setMeshFile(<span class="type">QStringLiteral</span>(<span class="string">":/mesh/largesphere.obj"</span>));
<span class="type">QImage</span> sunColor <span class="operator">=</span> <span class="type">QImage</span>(<span class="number">2</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="type">QImage</span><span class="operator">::</span>Format_RGB32);
sunColor<span class="operator">.</span>fill(<span class="type">QColor</span>(<span class="number">0xff</span><span class="operator">,</span> <span class="number">0xbb</span><span class="operator">,</span> <span class="number">0x00</span>));
m_sun<span class="operator">-</span><span class="operator">></span>setTextureImage(sunColor);
m_graph<span class="operator">-</span><span class="operator">></span>addSeries(m_magneticField);
m_graph<span class="operator">-</span><span class="operator">></span>addCustomItem(m_sun);
<span class="comment">// Configure the axes according to the data</span>
m_graph<span class="operator">-</span><span class="operator">></span>axisX()<span class="operator">-</span><span class="operator">></span>setRange(<span class="operator">-</span>horizontalRange<span class="operator">,</span> horizontalRange);
m_graph<span class="operator">-</span><span class="operator">></span>axisY()<span class="operator">-</span><span class="operator">></span>setRange(<span class="operator">-</span>verticalRange<span class="operator">,</span> verticalRange);
m_graph<span class="operator">-</span><span class="operator">></span>axisZ()<span class="operator">-</span><span class="operator">></span>setRange(<span class="operator">-</span>horizontalRange<span class="operator">,</span> horizontalRange);
m_graph<span class="operator">-</span><span class="operator">></span>axisX()<span class="operator">-</span><span class="operator">></span>setSegmentCount(<span class="type">int</span>(horizontalRange));
m_graph<span class="operator">-</span><span class="operator">></span>axisZ()<span class="operator">-</span><span class="operator">></span>setSegmentCount(<span class="type">int</span>(horizontalRange));
<span class="type">QObject</span><span class="operator">::</span>connect(<span class="operator">&</span>m_rotationTimer<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>ScatterDataModifier<span class="operator">::</span>triggerRotation);
toggleRotation();
generateData();
}
ScatterDataModifier<span class="operator">::</span><span class="operator">~</span>ScatterDataModifier()
{
<span class="keyword">delete</span> m_graph;
}
<span class="type">void</span> ScatterDataModifier<span class="operator">::</span>generateData()
{
<span class="comment">// Reusing existing array is computationally cheaper than always generating new array, even if</span>
<span class="comment">// all data items change in the array, if the array size doesn't change.</span>
<span class="keyword">if</span> (<span class="operator">!</span>m_magneticFieldArray)
m_magneticFieldArray <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qscatterdataproxy.html#QScatterDataArray-typedef">QScatterDataArray</a></span>;
<span class="type">int</span> arraySize <span class="operator">=</span> m_fieldLines <span class="operator">*</span> m_arrowsPerLine;
<span class="keyword">if</span> (arraySize <span class="operator">!</span><span class="operator">=</span> m_magneticFieldArray<span class="operator">-</span><span class="operator">></span>size())
m_magneticFieldArray<span class="operator">-</span><span class="operator">></span>resize(arraySize);
<span class="type"><a href="qscatterdataitem.html">QScatterDataItem</a></span> <span class="operator">*</span>ptrToDataArray <span class="operator">=</span> <span class="operator">&</span>m_magneticFieldArray<span class="operator">-</span><span class="operator">></span>first();
<span class="keyword">for</span> (<span class="type">float</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> m_fieldLines; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type">float</span> horizontalAngle <span class="operator">=</span> (doublePi <span class="operator">*</span> i) <span class="operator">/</span> m_fieldLines;
<span class="type">float</span> xCenter <span class="operator">=</span> ellipse_a <span class="operator">*</span> qCos(horizontalAngle);
<span class="type">float</span> zCenter <span class="operator">=</span> ellipse_a <span class="operator">*</span> qSin(horizontalAngle);
<span class="comment">// Rotate - arrow always tangential to origin</span>
<span class="type">QQuaternion</span> yRotation <span class="operator">=</span> <span class="type">QQuaternion</span><span class="operator">::</span>fromAxisAndAngle(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> horizontalAngle <span class="operator">*</span> radiansToDegrees);
<span class="keyword">for</span> (<span class="type">float</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator"><</span> m_arrowsPerLine; j<span class="operator">+</span><span class="operator">+</span>) {
<span class="comment">// Calculate point on ellipse centered on origin and parallel to x-axis</span>
<span class="type">float</span> verticalAngle <span class="operator">=</span> ((doublePi <span class="operator">*</span> j) <span class="operator">/</span> m_arrowsPerLine) <span class="operator">+</span> m_angleOffset;
<span class="type">float</span> xUnrotated <span class="operator">=</span> ellipse_a <span class="operator">*</span> qCos(verticalAngle);
<span class="type">float</span> y <span class="operator">=</span> ellipse_b <span class="operator">*</span> qSin(verticalAngle);
<span class="comment">// Rotate the ellipse around y-axis</span>
<span class="type">float</span> xRotated <span class="operator">=</span> xUnrotated <span class="operator">*</span> qCos(horizontalAngle);
<span class="type">float</span> zRotated <span class="operator">=</span> xUnrotated <span class="operator">*</span> qSin(horizontalAngle);
<span class="comment">// Add offset</span>
<span class="type">float</span> x <span class="operator">=</span> xCenter <span class="operator">+</span> xRotated;
<span class="type">float</span> z <span class="operator">=</span> zCenter <span class="operator">+</span> zRotated;
<span class="type">QQuaternion</span> zRotation <span class="operator">=</span> <span class="type">QQuaternion</span><span class="operator">::</span>fromAxisAndAngle(<span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> verticalAngle <span class="operator">*</span> radiansToDegrees);
<span class="type">QQuaternion</span> totalRotation <span class="operator">=</span> yRotation <span class="operator">*</span> zRotation;
ptrToDataArray<span class="operator">-</span><span class="operator">></span>setPosition(QVector3D(x<span class="operator">,</span> y<span class="operator">,</span> z));
ptrToDataArray<span class="operator">-</span><span class="operator">></span>setRotation(totalRotation);
ptrToDataArray<span class="operator">+</span><span class="operator">+</span>;
}
}
<span class="keyword">if</span> (m_graph<span class="operator">-</span><span class="operator">></span>selectedSeries() <span class="operator">=</span><span class="operator">=</span> m_magneticField)
m_graph<span class="operator">-</span><span class="operator">></span>clearSelection();
m_magneticField<span class="operator">-</span><span class="operator">></span>dataProxy()<span class="operator">-</span><span class="operator">></span>resetArray(m_magneticFieldArray);
}
<span class="type">void</span> ScatterDataModifier<span class="operator">::</span>setFieldLines(<span class="type">int</span> lines)
{
m_fieldLines <span class="operator">=</span> lines;
generateData();
}
<span class="type">void</span> ScatterDataModifier<span class="operator">::</span>setArrowsPerLine(<span class="type">int</span> arrows)
{
m_angleOffset <span class="operator">=</span> <span class="number">0.0f</span>;
m_angleStep <span class="operator">=</span> doublePi <span class="operator">/</span> m_arrowsPerLine <span class="operator">/</span> animationFrames;
m_arrowsPerLine <span class="operator">=</span> arrows;
generateData();
}
<span class="type">void</span> ScatterDataModifier<span class="operator">::</span>triggerRotation()
{
m_angleOffset <span class="operator">+</span><span class="operator">=</span> m_angleStep;
generateData();
}
<span class="type">void</span> ScatterDataModifier<span class="operator">::</span>toggleSun()
{
m_sun<span class="operator">-</span><span class="operator">></span>setVisible(<span class="operator">!</span>m_sun<span class="operator">-</span><span class="operator">></span>isVisible());
}
<span class="type">void</span> ScatterDataModifier<span class="operator">::</span>toggleRotation()
{
<span class="keyword">if</span> (m_rotationTimer<span class="operator">.</span>isActive())
m_rotationTimer<span class="operator">.</span>stop();
<span class="keyword">else</span>
m_rotationTimer<span class="operator">.</span>start(<span class="number">15</span>);
}
</pre>
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<!-- @@@rotations/scatterdatamodifier.cpp -->
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