Qt 5.6 | Qt Quick | Qt Quick Particles Examples - System | dynamiccomparison.qml Example File

Qt 5.6.2 Reference Documentation

# dynamiccomparison.qml Example File

particles/system/content/dynamiccomparison.qml

      /****************************************************************************
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      ** This file is part of the examples of the Qt Toolkit.
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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);
              }
          }
      }