customaffector.qml Example File

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  import QtQuick 2.0
  import QtQuick.Particles 2.0

  Item {
      width: 360
      height: 600

      Image {
          source: "../../images/backgroundLeaves.jpg"
          anchors.fill: parent
      }
      ParticleSystem {
          anchors.fill: parent
          Emitter {
              width: parent.width
              emitRate: 4
              lifeSpan: 14000
              size: 80
              velocity: PointDirection { y: 60 }
          }
          Wander {
              anchors.fill: parent
              anchors.bottomMargin: 100
              xVariance: 60
              pace: 60
          }

          Affector {
              property real coefficient: 0.1
              property real velocity: 1.5
              width: parent.width
              height: parent.height - 100
              onAffectParticles: {
              /*  //Linear movement
                  if (particle.r == 0) {
                      particle.r = Math.random() > 0.5 ? -1 : 1;
                  } else if (particle.r == 1) {
                      particle.rotation += velocity * dt;
                      if (particle.rotation >= maxAngle)
                          particle.r = -1;
                  } else if (particle.r == -1) {
                      particle.rotation -= velocity * dt;
                      if (particle.rotation <= -1 * maxAngle)
                          particle.r = 1;
                  }
              */
                  //Wobbly movement
                  for (var i=0; i<particles.length; i++) {
                      var particle = particles[i];
                      if (particle.r == 0.0) {
                          particle.r = Math.random() + 0.01;
                      }
                      particle.rotation += velocity * particle.r * dt;
                      particle.r -= particle.rotation * coefficient;
                      if (particle.r == 0.0)
                          particle.r -= particle.rotation * 0.000001;
                      particle.update = 1;
                  }
              }
          }

          Affector {//Custom Friction, adds some 'randomness'
              x: -60
              width: parent.width + 120
              height: 100
              anchors.bottom: parent.bottom
              onAffectParticles: {
                  for (var i=0; i<particles.length; i++) {
                      var particle = particles[i];
                      var pseudoRand = (Math.floor(particle.t*1327) % 10) + 1;
                      var yslow = dt * pseudoRand * 0.5 + 1;
                      var xslow = dt * pseudoRand * 0.05 + 1;
                      if (particle.vy < 1)
                          particle.vy = 0;
                      else
                          particle.vy = (particle.vy / yslow);
                      if (particle.vx < 1)
                          particle.vx = 0;
                      else
                          particle.vx = (particle.vx / xslow);
                      particle.update = true;
                  }
              }
          }

          ImageParticle {
              anchors.fill: parent
              id: particles
              sprites: [Sprite {
                      source: "../../images/realLeaf1.png"
                      frameCount: 1
                      frameDuration: 1
                      to: {"a":1, "b":1, "c":1, "d":1}
                  }, Sprite {
                      name: "a"
                      source: "../../images/realLeaf1.png"
                      frameCount: 1
                      frameDuration: 10000
                  },
                  Sprite {
                      name: "b"
                      source: "../../images/realLeaf2.png"
                      frameCount: 1
                      frameDuration: 10000
                  },
                  Sprite {
                      name: "c"
                      source: "../../images/realLeaf3.png"
                      frameCount: 1
                      frameDuration: 10000
                  },
                  Sprite {
                      name: "d"
                      source: "../../images/realLeaf4.png"
                      frameCount: 1
                      frameDuration: 10000
                  }
              ]

              z:4
          }
      }
  }