<?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>velocityfrommotion.qml Example File | Qt Quick 5.9</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 5.9</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-particles-emitters-example.html">Qt Quick Particles Examples - Emitters</a></td><td >velocityfrommotion.qml Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</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">velocityfrommotion.qml Example File</h1> <span class="subtitle">particles/emitters/content/velocityfrommotion.qml</span> <!-- $$$particles/emitters/content/velocityfrommotion.qml-description --> <div class="descr"> <a name="details"></a> <pre class="qml"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** 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. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> import QtQuick 2.0 import QtQuick.Particles 2.0 <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> { <span class="name">id</span>: <span class="name">root</span> <span class="name">height</span>: <span class="number">540</span> <span class="name">width</span>: <span class="number">360</span> <span class="name">gradient</span>: <span class="name">Gradient</span> { <span class="type"><a href="qml-qtquick-gradientstop.html">GradientStop</a></span> { <span class="name">position</span>: <span class="number">0</span>; <span class="name">color</span>: <span class="string">"#000020"</span> } <span class="type"><a href="qml-qtquick-gradientstop.html">GradientStop</a></span> { <span class="name">position</span>: <span class="number">1</span>; <span class="name">color</span>: <span class="string">"#000000"</span> } } <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> { <span class="name">id</span>: <span class="name">mouseArea</span> <span class="name">anchors</span>.fill: <span class="name">root</span> } <span class="type"><a href="qml-qtquick-particles-particlesystem.html">ParticleSystem</a></span> { <span class="name">id</span>: <span class="name">sys1</span> } <span class="type"><a href="qml-qtquick-particles-imageparticle.html">ImageParticle</a></span> { <span class="name">system</span>: <span class="name">sys1</span> <span class="name">source</span>: <span class="string">"qrc:///particleresources/glowdot.png"</span> <span class="name">color</span>: <span class="string">"cyan"</span> <span class="name">alpha</span>: <span class="number">0</span> SequentialAnimation on <span class="name">color</span> { <span class="name">loops</span>: <span class="name">Animation</span>.<span class="name">Infinite</span> <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"cyan"</span> <span class="name">to</span>: <span class="string">"magenta"</span> <span class="name">duration</span>: <span class="number">1000</span> } <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"magenta"</span> <span class="name">to</span>: <span class="string">"blue"</span> <span class="name">duration</span>: <span class="number">2000</span> } <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"blue"</span> <span class="name">to</span>: <span class="string">"violet"</span> <span class="name">duration</span>: <span class="number">2000</span> } <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"violet"</span> <span class="name">to</span>: <span class="string">"cyan"</span> <span class="name">duration</span>: <span class="number">2000</span> } } <span class="name">colorVariation</span>: <span class="number">0.3</span> } <span class="type"><a href="qml-qtquick-particles-emitter.html">Emitter</a></span> { <span class="name">id</span>: <span class="name">trailsNormal</span> <span class="name">system</span>: <span class="name">sys1</span> <span class="name">emitRate</span>: <span class="number">500</span> <span class="name">lifeSpan</span>: <span class="number">2000</span> <span class="name">y</span>: <span class="name">mouseArea</span>.<span class="name">pressed</span> ? <span class="name">mouseArea</span>.<span class="name">mouseY</span> : <span class="name">circle</span>.<span class="name">cy</span> <span class="name">x</span>: <span class="name">mouseArea</span>.<span class="name">pressed</span> ? <span class="name">mouseArea</span>.<span class="name">mouseX</span> : <span class="name">circle</span>.<span class="name">cx</span> <span class="name">velocity</span>: <span class="name">PointDirection</span> {<span class="name">xVariation</span>: <span class="number">4</span>; <span class="name">yVariation</span>: <span class="number">4</span>;} <span class="name">acceleration</span>: <span class="name">PointDirection</span> {<span class="name">xVariation</span>: <span class="number">10</span>; <span class="name">yVariation</span>: <span class="number">10</span>;} <span class="name">velocityFromMovement</span>: <span class="number">8</span> <span class="name">size</span>: <span class="number">8</span> <span class="name">sizeVariation</span>: <span class="number">4</span> } <span class="type"><a href="qml-qtquick-particles-particlesystem.html">ParticleSystem</a></span> { <span class="name">id</span>: <span class="name">sys2</span> } <span class="type"><a href="qml-qtquick-particles-imageparticle.html">ImageParticle</a></span> { <span class="name">color</span>: <span class="string">"cyan"</span> <span class="name">system</span>: <span class="name">sys2</span> <span class="name">alpha</span>: <span class="number">0</span> SequentialAnimation on <span class="name">color</span> { <span class="name">loops</span>: <span class="name">Animation</span>.<span class="name">Infinite</span> <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"magenta"</span> <span class="name">to</span>: <span class="string">"cyan"</span> <span class="name">duration</span>: <span class="number">1000</span> } <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"cyan"</span> <span class="name">to</span>: <span class="string">"magenta"</span> <span class="name">duration</span>: <span class="number">2000</span> } } <span class="name">colorVariation</span>: <span class="number">0.5</span> <span class="name">source</span>: <span class="string">"qrc:///particleresources/star.png"</span> } <span class="type"><a href="qml-qtquick-particles-emitter.html">Emitter</a></span> { <span class="name">id</span>: <span class="name">trailsStars</span> <span class="name">system</span>: <span class="name">sys2</span> <span class="name">emitRate</span>: <span class="number">100</span> <span class="name">lifeSpan</span>: <span class="number">2200</span> <span class="name">y</span>: <span class="name">mouseArea</span>.<span class="name">pressed</span> ? <span class="name">mouseArea</span>.<span class="name">mouseY</span> : <span class="name">circle</span>.<span class="name">cy</span> <span class="name">x</span>: <span class="name">mouseArea</span>.<span class="name">pressed</span> ? <span class="name">mouseArea</span>.<span class="name">mouseX</span> : <span class="name">circle</span>.<span class="name">cx</span> <span class="name">velocity</span>: <span class="name">PointDirection</span> {<span class="name">xVariation</span>: <span class="number">4</span>; <span class="name">yVariation</span>: <span class="number">4</span>;} <span class="name">acceleration</span>: <span class="name">PointDirection</span> {<span class="name">xVariation</span>: <span class="number">10</span>; <span class="name">yVariation</span>: <span class="number">10</span>;} <span class="name">velocityFromMovement</span>: <span class="number">8</span> <span class="name">size</span>: <span class="number">22</span> <span class="name">sizeVariation</span>: <span class="number">4</span> } <span class="type"><a href="qml-qtquick-particles-particlesystem.html">ParticleSystem</a></span> { <span class="name">id</span>: <span class="name">sys3</span>; } <span class="type"><a href="qml-qtquick-particles-imageparticle.html">ImageParticle</a></span> { <span class="name">source</span>: <span class="string">"qrc:///particleresources/glowdot.png"</span> <span class="name">system</span>: <span class="name">sys3</span> <span class="name">color</span>: <span class="string">"orange"</span> <span class="name">alpha</span>: <span class="number">0</span> SequentialAnimation on <span class="name">color</span> { <span class="name">loops</span>: <span class="name">Animation</span>.<span class="name">Infinite</span> <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"red"</span> <span class="name">to</span>: <span class="string">"green"</span> <span class="name">duration</span>: <span class="number">2000</span> } <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"green"</span> <span class="name">to</span>: <span class="string">"red"</span> <span class="name">duration</span>: <span class="number">2000</span> } } <span class="name">colorVariation</span>: <span class="number">0.2</span> } <span class="type"><a href="qml-qtquick-particles-emitter.html">Emitter</a></span> { <span class="name">id</span>: <span class="name">trailsNormal2</span> <span class="name">system</span>: <span class="name">sys3</span> <span class="name">emitRate</span>: <span class="number">300</span> <span class="name">lifeSpan</span>: <span class="number">2000</span> <span class="name">y</span>: <span class="name">mouseArea</span>.<span class="name">pressed</span> ? <span class="name">mouseArea</span>.<span class="name">mouseY</span> : <span class="name">circle2</span>.<span class="name">cy</span> <span class="name">x</span>: <span class="name">mouseArea</span>.<span class="name">pressed</span> ? <span class="name">mouseArea</span>.<span class="name">mouseX</span> : <span class="name">circle2</span>.<span class="name">cx</span> <span class="name">velocityFromMovement</span>: <span class="number">16</span> <span class="name">velocity</span>: <span class="name">PointDirection</span> {<span class="name">xVariation</span>: <span class="number">4</span>; <span class="name">yVariation</span>: <span class="number">4</span>;} <span class="name">acceleration</span>: <span class="name">PointDirection</span> {<span class="name">xVariation</span>: <span class="number">10</span>; <span class="name">yVariation</span>: <span class="number">10</span>;} <span class="name">size</span>: <span class="number">12</span> <span class="name">sizeVariation</span>: <span class="number">4</span> } <span class="type"><a href="qml-qtquick-particles-particlesystem.html">ParticleSystem</a></span> { <span class="name">id</span>: <span class="name">sys4</span>; } <span class="type"><a href="qml-qtquick-particles-imageparticle.html">ImageParticle</a></span> { <span class="name">system</span>: <span class="name">sys4</span> <span class="name">source</span>: <span class="string">"qrc:///particleresources/star.png"</span> <span class="name">color</span>: <span class="string">"green"</span> <span class="name">alpha</span>: <span class="number">0</span> SequentialAnimation on <span class="name">color</span> { <span class="name">loops</span>: <span class="name">Animation</span>.<span class="name">Infinite</span> <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"green"</span> <span class="name">to</span>: <span class="string">"red"</span> <span class="name">duration</span>: <span class="number">2000</span> } <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">from</span>: <span class="string">"red"</span> <span class="name">to</span>: <span class="string">"green"</span> <span class="name">duration</span>: <span class="number">2000</span> } } <span class="name">colorVariation</span>: <span class="number">0.5</span> } <span class="type"><a href="qml-qtquick-particles-emitter.html">Emitter</a></span> { <span class="name">id</span>: <span class="name">trailsStars2</span> <span class="name">system</span>: <span class="name">sys4</span> <span class="name">emitRate</span>: <span class="number">50</span> <span class="name">lifeSpan</span>: <span class="number">2200</span> <span class="name">y</span>: <span class="name">mouseArea</span>.<span class="name">pressed</span> ? <span class="name">mouseArea</span>.<span class="name">mouseY</span> : <span class="name">circle2</span>.<span class="name">cy</span> <span class="name">x</span>: <span class="name">mouseArea</span>.<span class="name">pressed</span> ? <span class="name">mouseArea</span>.<span class="name">mouseX</span> : <span class="name">circle2</span>.<span class="name">cx</span> <span class="name">velocityFromMovement</span>: <span class="number">16</span> <span class="name">velocity</span>: <span class="name">PointDirection</span> {<span class="name">xVariation</span>: <span class="number">2</span>; <span class="name">yVariation</span>: <span class="number">2</span>;} <span class="name">acceleration</span>: <span class="name">PointDirection</span> {<span class="name">xVariation</span>: <span class="number">10</span>; <span class="name">yVariation</span>: <span class="number">10</span>;} <span class="name">size</span>: <span class="number">22</span> <span class="name">sizeVariation</span>: <span class="number">4</span> } <span class="name">color</span>: <span class="string">"white"</span> <span class="type"><a href="qml-qtquick-item.html">Item</a></span> { <span class="name">id</span>: <span class="name">circle</span> <span class="comment">//anchors.fill: parent</span> property <span class="type">real</span> <span class="name">radius</span>: <span class="number">0</span> property <span class="type">real</span> <span class="name">dx</span>: <span class="name">root</span>.<span class="name">width</span> <span class="operator">/</span> <span class="number">2</span> property <span class="type">real</span> <span class="name">dy</span>: <span class="name">root</span>.<span class="name">height</span> <span class="operator">/</span> <span class="number">2</span> property <span class="type">real</span> <span class="name">cx</span>: <span class="name">radius</span> <span class="operator">*</span> <span class="name">Math</span>.<span class="name">sin</span>(<span class="name">percent</span><span class="operator">*</span><span class="number">6.283185307179</span>) <span class="operator">+</span> <span class="name">dx</span> property <span class="type">real</span> <span class="name">cy</span>: <span class="name">radius</span> <span class="operator">*</span> <span class="name">Math</span>.<span class="name">cos</span>(<span class="name">percent</span><span class="operator">*</span><span class="number">6.283185307179</span>) <span class="operator">+</span> <span class="name">dy</span> property <span class="type">real</span> <span class="name">percent</span>: <span class="number">0</span> SequentialAnimation on <span class="name">percent</span> { <span class="name">loops</span>: <span class="name">Animation</span>.<span class="name">Infinite</span> <span class="name">running</span>: <span class="number">true</span> <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">duration</span>: <span class="number">1000</span> <span class="name">from</span>: <span class="number">1</span> <span class="name">to</span>: <span class="number">0</span> <span class="name">loops</span>: <span class="number">8</span> } <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">duration</span>: <span class="number">1000</span> <span class="name">from</span>: <span class="number">0</span> <span class="name">to</span>: <span class="number">1</span> <span class="name">loops</span>: <span class="number">8</span> } } SequentialAnimation on <span class="name">radius</span> { <span class="name">loops</span>: <span class="name">Animation</span>.<span class="name">Infinite</span> <span class="name">running</span>: <span class="number">true</span> <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">duration</span>: <span class="number">4000</span> <span class="name">from</span>: <span class="number">0</span> <span class="name">to</span>: <span class="number">100</span> } <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">duration</span>: <span class="number">4000</span> <span class="name">from</span>: <span class="number">100</span> <span class="name">to</span>: <span class="number">0</span> } } } <span class="type"><a href="qml-qtquick-item.html">Item</a></span> { <span class="name">id</span>: <span class="name">circle3</span> property <span class="type">real</span> <span class="name">radius</span>: <span class="number">100</span> property <span class="type">real</span> <span class="name">dx</span>: <span class="name">root</span>.<span class="name">width</span> <span class="operator">/</span> <span class="number">2</span> property <span class="type">real</span> <span class="name">dy</span>: <span class="name">root</span>.<span class="name">height</span> <span class="operator">/</span> <span class="number">2</span> property <span class="type">real</span> <span class="name">cx</span>: <span class="name">radius</span> <span class="operator">*</span> <span class="name">Math</span>.<span class="name">sin</span>(<span class="name">percent</span><span class="operator">*</span><span class="number">6.283185307179</span>) <span class="operator">+</span> <span class="name">dx</span> property <span class="type">real</span> <span class="name">cy</span>: <span class="name">radius</span> <span class="operator">*</span> <span class="name">Math</span>.<span class="name">cos</span>(<span class="name">percent</span><span class="operator">*</span><span class="number">6.283185307179</span>) <span class="operator">+</span> <span class="name">dy</span> property <span class="type">real</span> <span class="name">percent</span>: <span class="number">0</span> SequentialAnimation on <span class="name">percent</span> { <span class="name">loops</span>: <span class="name">Animation</span>.<span class="name">Infinite</span> <span class="name">running</span>: <span class="number">true</span> <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">from</span>: <span class="number">0.0</span>; <span class="name">to</span>: <span class="number">1</span> ; <span class="name">duration</span>: <span class="number">10000</span>; } } } <span class="type"><a href="qml-qtquick-item.html">Item</a></span> { <span class="name">id</span>: <span class="name">circle2</span> property <span class="type">real</span> <span class="name">radius</span>: <span class="number">30</span> property <span class="type">real</span> <span class="name">dx</span>: <span class="name">circle3</span>.<span class="name">cx</span> property <span class="type">real</span> <span class="name">dy</span>: <span class="name">circle3</span>.<span class="name">cy</span> property <span class="type">real</span> <span class="name">cx</span>: <span class="name">radius</span> <span class="operator">*</span> <span class="name">Math</span>.<span class="name">sin</span>(<span class="name">percent</span><span class="operator">*</span><span class="number">6.283185307179</span>) <span class="operator">+</span> <span class="name">dx</span> property <span class="type">real</span> <span class="name">cy</span>: <span class="name">radius</span> <span class="operator">*</span> <span class="name">Math</span>.<span class="name">cos</span>(<span class="name">percent</span><span class="operator">*</span><span class="number">6.283185307179</span>) <span class="operator">+</span> <span class="name">dy</span> property <span class="type">real</span> <span class="name">percent</span>: <span class="number">0</span> SequentialAnimation on <span class="name">percent</span> { <span class="name">loops</span>: <span class="name">Animation</span>.<span class="name">Infinite</span> <span class="name">running</span>: <span class="number">true</span> <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">from</span>: <span class="number">0.0</span>; <span class="name">to</span>: <span class="number">1</span> ; <span class="name">duration</span>: <span class="number">1000</span>; } } } } </pre> </div> <!-- @@@particles/emitters/content/velocityfrommotion.qml --> </div> </div> </div> </div> </div> <div class="footer"> <p> <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 of their respective owners. </p> </div> </body> </html>