<?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 5.12.6</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="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"><a href="qtquick-index.html">Qt 5.12.6 Reference Documentation</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">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"> /**************************************************************************** ** ** 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ import QtQuick 2.0 import QtQuick.Particles 2.0 Rectangle { id: root height: 540 width: 360 gradient: Gradient { GradientStop { position: 0; color: "#000020" } GradientStop { position: 1; color: "#000000" } } MouseArea { id: mouseArea anchors.fill: root } ParticleSystem { id: sys1 } ImageParticle { system: sys1 source: "qrc:///particleresources/glowdot.png" color: "cyan" alpha: 0 SequentialAnimation on color { loops: Animation.Infinite ColorAnimation { from: "cyan" to: "magenta" duration: 1000 } ColorAnimation { from: "magenta" to: "blue" duration: 2000 } ColorAnimation { from: "blue" to: "violet" duration: 2000 } ColorAnimation { from: "violet" to: "cyan" duration: 2000 } } colorVariation: 0.3 } Emitter { id: trailsNormal system: sys1 emitRate: 500 lifeSpan: 2000 y: mouseArea.pressed ? mouseArea.mouseY : circle.cy x: mouseArea.pressed ? mouseArea.mouseX : circle.cx velocity: PointDirection {xVariation: 4; yVariation: 4;} acceleration: PointDirection {xVariation: 10; yVariation: 10;} velocityFromMovement: 8 size: 8 sizeVariation: 4 } ParticleSystem { id: sys2 } ImageParticle { color: "cyan" system: sys2 alpha: 0 SequentialAnimation on color { loops: Animation.Infinite ColorAnimation { from: "magenta" to: "cyan" duration: 1000 } ColorAnimation { from: "cyan" to: "magenta" duration: 2000 } } colorVariation: 0.5 source: "qrc:///particleresources/star.png" } Emitter { id: trailsStars system: sys2 emitRate: 100 lifeSpan: 2200 y: mouseArea.pressed ? mouseArea.mouseY : circle.cy x: mouseArea.pressed ? mouseArea.mouseX : circle.cx velocity: PointDirection {xVariation: 4; yVariation: 4;} acceleration: PointDirection {xVariation: 10; yVariation: 10;} velocityFromMovement: 8 size: 22 sizeVariation: 4 } ParticleSystem { id: sys3; } ImageParticle { source: "qrc:///particleresources/glowdot.png" system: sys3 color: "orange" alpha: 0 SequentialAnimation on color { loops: Animation.Infinite ColorAnimation { from: "red" to: "green" duration: 2000 } ColorAnimation { from: "green" to: "red" duration: 2000 } } colorVariation: 0.2 } Emitter { id: trailsNormal2 system: sys3 emitRate: 300 lifeSpan: 2000 y: mouseArea.pressed ? mouseArea.mouseY : circle2.cy x: mouseArea.pressed ? mouseArea.mouseX : circle2.cx velocityFromMovement: 16 velocity: PointDirection {xVariation: 4; yVariation: 4;} acceleration: PointDirection {xVariation: 10; yVariation: 10;} size: 12 sizeVariation: 4 } ParticleSystem { id: sys4; } ImageParticle { system: sys4 source: "qrc:///particleresources/star.png" color: "green" alpha: 0 SequentialAnimation on color { loops: Animation.Infinite ColorAnimation { from: "green" to: "red" duration: 2000 } ColorAnimation { from: "red" to: "green" duration: 2000 } } colorVariation: 0.5 } Emitter { id: trailsStars2 system: sys4 emitRate: 50 lifeSpan: 2200 y: mouseArea.pressed ? mouseArea.mouseY : circle2.cy x: mouseArea.pressed ? mouseArea.mouseX : circle2.cx velocityFromMovement: 16 velocity: PointDirection {xVariation: 2; yVariation: 2;} acceleration: PointDirection {xVariation: 10; yVariation: 10;} size: 22 sizeVariation: 4 } color: "white" Item { id: circle //anchors.fill: parent property real radius: 0 property real dx: root.width / 2 property real dy: root.height / 2 property real cx: radius * Math.sin(percent*6.283185307179) + dx property real cy: radius * Math.cos(percent*6.283185307179) + dy property real percent: 0 SequentialAnimation on percent { loops: Animation.Infinite running: true NumberAnimation { duration: 1000 from: 1 to: 0 loops: 8 } NumberAnimation { duration: 1000 from: 0 to: 1 loops: 8 } } SequentialAnimation on radius { loops: Animation.Infinite running: true NumberAnimation { duration: 4000 from: 0 to: 100 } NumberAnimation { duration: 4000 from: 100 to: 0 } } } Item { id: circle3 property real radius: 100 property real dx: root.width / 2 property real dy: root.height / 2 property real cx: radius * Math.sin(percent*6.283185307179) + dx property real cy: radius * Math.cos(percent*6.283185307179) + dy property real percent: 0 SequentialAnimation on percent { loops: Animation.Infinite running: true NumberAnimation { from: 0.0; to: 1 ; duration: 10000; } } } Item { id: circle2 property real radius: 30 property real dx: circle3.cx property real dy: circle3.cy property real cx: radius * Math.sin(percent*6.283185307179) + dx property real cy: radius * Math.cos(percent*6.283185307179) + dy property real percent: 0 SequentialAnimation on percent { loops: Animation.Infinite running: true NumberAnimation { from: 0.0; to: 1 ; duration: 1000; } } } } </pre> </div> <!-- @@@particles/emitters/content/velocityfrommotion.qml --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. 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