customaffector.qml Example File | Qt Quick 5.12.9

- Qt 5.12
- Qt Quick
- Qt Quick Particles Examples - Affectors
- customaffector.qml Example File
- Qt 5.12.9 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
             }
         }
     }