<?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>scatterdatamodifier.cpp Example File | Qt Data Visualization 5.12.6</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 5.12</td><td ><a href="qtdatavisualization-index.html">Qt Data Visualization</a></td><td ><a href="qtdatavisualization-rotations-example.html">Rotations Example</a></td><td >scatterdatamodifier.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtdatavisualization-index.html">Qt Data Visualization | Commercial or GPLv3</a></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">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> </div> <!-- @@@rotations/scatterdatamodifier.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 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>