Qt 5.7Qt QuickQt Quick Particles Examples - Emittersvelocityfrommotion.qml Example File
Qt 5.7.1 Reference Documentation

velocityfrommotion.qml Example File

particles/emitters/content/velocityfrommotion.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

      height: 540
      width: 360

      gradient: Gradient {
          GradientStop { position: 0; color: "#000020" }
          GradientStop { position: 1; color: "#000000" }
      }

      MouseArea {
          id: mouseArea
          anchors.fill: root
      }

      ParticleSystem { id: sys1 }
      ImageParticle {
          system: sys1
          source: "qrc:///particleresources/glowdot.png"
          color: "cyan"
          alpha: 0
          SequentialAnimation on color {
              loops: Animation.Infinite
              ColorAnimation {
                  from: "cyan"
                  to: "magenta"
                  duration: 1000
              }
              ColorAnimation {
                  from: "magenta"
                  to: "blue"
                  duration: 2000
              }
              ColorAnimation {
                  from: "blue"
                  to: "violet"
                  duration: 2000
              }
              ColorAnimation {
                  from: "violet"
                  to: "cyan"
                  duration: 2000
              }
          }
          colorVariation: 0.3
      }
      Emitter {
          id: trailsNormal
          system: sys1

          emitRate: 500
          lifeSpan: 2000

          y: mouseArea.pressed ? mouseArea.mouseY : circle.cy
          x: mouseArea.pressed ? mouseArea.mouseX : circle.cx

          velocity: PointDirection {xVariation: 4; yVariation: 4;}
          acceleration: PointDirection {xVariation: 10; yVariation: 10;}
          velocityFromMovement: 8

          size: 8
          sizeVariation: 4
      }
      ParticleSystem { id: sys2 }
      ImageParticle {
          color: "cyan"
          system: sys2
          alpha: 0
          SequentialAnimation on color {
              loops: Animation.Infinite
              ColorAnimation {
                  from: "magenta"
                  to: "cyan"
                  duration: 1000
              }
              ColorAnimation {
                  from: "cyan"
                  to: "magenta"
                  duration: 2000
              }
          }
          colorVariation: 0.5
          source: "qrc:///particleresources/star.png"
      }
      Emitter {
          id: trailsStars
          system: sys2

          emitRate: 100
          lifeSpan: 2200

          y: mouseArea.pressed ? mouseArea.mouseY : circle.cy
          x: mouseArea.pressed ? mouseArea.mouseX : circle.cx

          velocity: PointDirection {xVariation: 4; yVariation: 4;}
          acceleration: PointDirection {xVariation: 10; yVariation: 10;}
          velocityFromMovement: 8

          size: 22
          sizeVariation: 4
      }
      ParticleSystem { id: sys3; }
      ImageParticle {
          source: "qrc:///particleresources/glowdot.png"
          system: sys3
          color: "orange"
          alpha: 0
          SequentialAnimation on color {
              loops: Animation.Infinite
              ColorAnimation {
                  from: "red"
                  to: "green"
                  duration: 2000
              }
              ColorAnimation {
                  from: "green"
                  to: "red"
                  duration: 2000
              }
          }

          colorVariation: 0.2

      }
      Emitter {
          id: trailsNormal2
          system: sys3

          emitRate: 300
          lifeSpan: 2000

          y: mouseArea.pressed ? mouseArea.mouseY : circle2.cy
          x: mouseArea.pressed ? mouseArea.mouseX : circle2.cx

          velocityFromMovement: 16

          velocity: PointDirection {xVariation: 4; yVariation: 4;}
          acceleration: PointDirection {xVariation: 10; yVariation: 10;}

          size: 12
          sizeVariation: 4
      }
      ParticleSystem { id: sys4; }
      ImageParticle {
          system: sys4
          source: "qrc:///particleresources/star.png"
          color: "green"
          alpha: 0
          SequentialAnimation on color {
              loops: Animation.Infinite
              ColorAnimation {
                  from: "green"
                  to: "red"
                  duration: 2000
              }
              ColorAnimation {
                  from: "red"
                  to: "green"
                  duration: 2000
              }
          }

          colorVariation: 0.5
      }
      Emitter {
          id: trailsStars2
          system: sys4

          emitRate: 50
          lifeSpan: 2200

          y: mouseArea.pressed ? mouseArea.mouseY : circle2.cy
          x: mouseArea.pressed ? mouseArea.mouseX : circle2.cx

          velocityFromMovement: 16
          velocity: PointDirection {xVariation: 2; yVariation: 2;}
          acceleration: PointDirection {xVariation: 10; yVariation: 10;}

          size: 22
          sizeVariation: 4
      }

      color: "white"

      Item {
          id: circle
          //anchors.fill: parent
          property real radius: 0
          property real dx: root.width / 2
          property real dy: root.height / 2
          property real cx: radius * Math.sin(percent*6.283185307179) + dx
          property real cy: radius * Math.cos(percent*6.283185307179) + dy
          property real percent: 0

          SequentialAnimation on percent {
              loops: Animation.Infinite
              running: true
              NumberAnimation {
              duration: 1000
              from: 1
              to: 0
              loops: 8
              }
              NumberAnimation {
              duration: 1000
              from: 0
              to: 1
              loops: 8
              }

          }

          SequentialAnimation on radius {
              loops: Animation.Infinite
              running: true
              NumberAnimation {
                  duration: 4000
                  from: 0
                  to: 100
              }
              NumberAnimation {
                  duration: 4000
                  from: 100
                  to: 0
              }
          }
      }

      Item {
          id: circle3
          property real radius: 100
          property real dx: root.width / 2
          property real dy: root.height / 2
          property real cx: radius * Math.sin(percent*6.283185307179) + dx
          property real cy: radius * Math.cos(percent*6.283185307179) + dy
          property real percent: 0

          SequentialAnimation on percent {
              loops: Animation.Infinite
              running: true
              NumberAnimation { from: 0.0; to: 1 ; duration: 10000;  }
          }
      }

      Item {
          id: circle2
          property real radius: 30
          property real dx: circle3.cx
          property real dy: circle3.cy
          property real cx: radius * Math.sin(percent*6.283185307179) + dx
          property real cy: radius * Math.cos(percent*6.283185307179) + dy
          property real percent: 0

          SequentialAnimation on percent {
              loops: Animation.Infinite
              running: true
              NumberAnimation { from: 0.0; to: 1 ; duration: 1000; }
          }
      }

  }

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