dynamiccomparison.qml Example File

particles/system/content/dynamiccomparison.qml
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 import QtQuick 2.0
 import QtQuick.Particles 2.0

 Rectangle {
     id: root
     color: "black"
     width: 640
     height: 480
     ParticleSystem {
         id: sys
     }

     ImageParticle {
         system: sys
         source: "qrc:///particleresources/glowdot.png"
         color: "white"
         colorVariation: 1.0
         alpha: 0.1
         entryEffect: ImageParticle.None
     }

     Emitter {
         id: emitter
         system: sys
         width: parent.width/2
         velocity: PointDirection {y: 72; yVariation: 24}
         lifeSpan: 10000
         emitRate: 1000
         enabled: false
         size: 32
     }

     Item {
         id: fakeEmitter
         function burst(number) {
             while (number > 0) {
                 var item = fakeParticle.createObject(root);
                 item.lifeSpan = Math.random() * 5000 + 5000;
                 item.x = Math.random() * (root.width/2) + (root.width/2);
                 item.y = 0;
                 number--;
             }
         }

         Component {
             id: fakeParticle
             Image {
                 id: container
                 property int lifeSpan: 10000
                 width: 32
                 height: 32
                 source: "qrc:///particleresources/glowdot.png"
                 y: 0
                 PropertyAnimation on y {from: -16; to: root.height-16; duration: container.lifeSpan; running: true}
                 SequentialAnimation on opacity {
                     running: true
                     NumberAnimation { from:0; to: 1; duration: 500}
                     PauseAnimation { duration: container.lifeSpan - 1000}
                     NumberAnimation { from:1; to: 0; duration: 500}
                     ScriptAction { script: container.destroy(); }
                 }
             }
         }
     }

     //Hooked to a timer, but click for extra bursts that really stress performance
     Timer {
         interval: 10000
         triggeredOnStart: true
         repeat: true
         running: true
         onTriggered: {
             emitter.burst(1000);
             fakeEmitter.burst(1000);
         }
     }
     Text {
         anchors.left: parent.left
         anchors.bottom: parent.bottom
         text: "1000 particles"
         color: "white"
         MouseArea {
             anchors.fill: parent
             onClicked: emitter.burst(1000);
         }
     }
     Text {
         anchors.right: parent.right
         anchors.bottom: parent.bottom
         text: "1000 items"
         color: "white"
         MouseArea {
             anchors.fill: parent
             onClicked: fakeEmitter.burst(1000);
         }
     }
 }