dynamiccomparison.qml Example File | Qt Quick 5.12.10

- Qt 5.12
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- Qt Quick Particles Examples - System
- dynamiccomparison.qml Example File
- Qt 5.12.10 Reference Documentation

# 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);
             }
         }
     }