Qt 5.11 | Qt Quick | Qt Quick Particles Examples - Affectors | customaffector.qml Example File

Qt 5.11.3 Reference Documentation

# customaffector.qml Example File

particles/affectors/content/customaffector.qml

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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
              }
          }
      }