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<h1 class="title">customemitter.qml Example File</h1>
<span class="subtitle">particles/emitters/content/customemitter.qml</span>
<!-- $$$particles/emitters/content/customemitter.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:
  **
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  ** 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
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  import QtQuick 2.0
  import QtQuick.Particles 2.0

  ParticleSystem {
      id: sys
      width: 360
      height: 600
      running: true
      Rectangle {
          z: -1
          anchors.fill: parent
          color: "black"
      }

      property real petalLength: 180
      property real petalRotation: 0
      NumberAnimation on petalRotation {
          from: 0;
          to: 360;
          loops: -1;
          running: true
          duration: 24000
      }

      function convert(a) {return a*(Math.PI/180);}
      Emitter {
          lifeSpan: 4000
          emitRate: 120
          size: 12
          anchors.centerIn: parent
          onEmitParticles: {
              for (var i=0; i<particles.length; i++) {
                  var particle = particles[i];
                  particle.startSize = Math.max(02,Math.min(492,Math.tan(particle.t/2)*24));
                  var theta = Math.floor(Math.random() * 6.0);
                  particle.red = theta == 0 || theta == 1 || theta == 2 ? 0.2 : 1;
                  particle.green = theta == 2 || theta == 3 || theta == 4 ? 0.2 : 1;
                  particle.blue = theta == 4 || theta == 5 || theta == 0 ? 0.2 : 1;
                  theta /= 6.0;
                  theta *= 2.0*Math.PI;
                  theta += sys.convert(sys.petalRotation);//Convert from degrees to radians
                  particle.initialVX = petalLength * Math.cos(theta);
                  particle.initialVY = petalLength * Math.sin(theta);
                  particle.initialAX = particle.initialVX * -0.5;
                  particle.initialAY = particle.initialVY * -0.5;
              }
          }
      }

      ImageParticle {
          source: "qrc:///particleresources/fuzzydot.png"
          alpha: 0.0
      }
  }

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