customemitter.qml Example File | Qt Quick 5.12.8

- Qt 5.12
- Qt Quick
- Qt Quick Particles Examples - Emitters
- customemitter.qml Example File
- Qt 5.12.8 Reference Documentation

# customemitter.qml Example File

particles/emitters/content/customemitter.qml

     /****************************************************************************
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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
         }
     }