Qt 5.7 | Qt Quick | Qt Quick Particles Examples - System | dynamicemitters.qml Example File

Qt 5.7.1 Reference Documentation

# dynamicemitters.qml Example File

particles/system/content/dynamicemitters.qml

      /****************************************************************************
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      ** Contact: http://www.qt.io/licensing/
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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
          }

          Component {
              id: emitterComp
              Emitter {
                  id: container
                  Emitter {
                      id: emitMore
                      system: sys
                      emitRate: 128
                      lifeSpan: 600
                      size: 16
                      endSize: 8
                      velocity: AngleDirection {angleVariation:360; magnitude: 60}
                  }

                  property int life: 2600
                  property real targetX: 0
                  property real targetY: 0
                  function go() {
                      xAnim.start();
                      yAnim.start();
                      container.enabled = true
                  }
                  system: sys
                  emitRate: 32
                  lifeSpan: 600
                  size: 24
                  endSize: 8
                  NumberAnimation on x {
                      id: xAnim;
                      to: targetX
                      duration: life
                      running: false
                  }
                  NumberAnimation on y {
                      id: yAnim;
                      to: targetY
                      duration: life
                      running: false
                  }
                  Timer {
                      interval: life
                      running: true
                      onTriggered: container.destroy();
                  }
              }
          }

          function customEmit(x,y) {
              for (var i=0; i<8; i++) {
                  var obj = emitterComp.createObject(root);
                  obj.x = x
                  obj.y = y
                  obj.targetX = Math.random() * 240 - 120 + obj.x
                  obj.targetY = Math.random() * 240 - 120 + obj.y
                  obj.life = Math.round(Math.random() * 2400) + 200
                  obj.emitRate = Math.round(Math.random() * 32) + 32
                  obj.go();
              }
          }

          Timer {
              interval: 10000
              triggeredOnStart: true
              running: true
              repeat: true
              onTriggered: customEmit(Math.random() * 320, Math.random() * 480)
          }
          MouseArea {
              anchors.fill: parent
              onClicked: customEmit(mouse.x, mouse.y);
          }

          Text {
              anchors.horizontalCenter: parent.horizontalCenter
              text: "Click Somewhere"
              color: "white"
              font.pixelSize: 24
          }
      }