Qt 5.11 | Qt Quick | Qt Quick Particles Examples - Emitters | velocityfrommotion.qml Example File

Qt 5.11.3 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; }
              }
          }

      }