Warning, /plasma/libplasma/examples/wallpapers/autumn/contents/ui/main.qml is written in an unsupported language. File is not indexed.

 /*
     SPDX-FileCopyrightText: 2013 Digia Plc and /or its subsidiary(-ies) <http://www.qt-project.org/legal>
 
     This file is part of the examples of the Qt Toolkit.
 
     SPDX-License-Identifier: BSD-3-Clause
 */
 
 import QtQuick
 import QtQuick.Particles
 
 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: wallpaper.configuration.Speed }
         }
         Wander {
             anchors.fill: parent
             anchors.bottomMargin: 100
             xVariance: 60
             pace: 60
         }
 
         //! [0]
         Affector {
             property real coefficient: 2.0
             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;
                 }
             }
         }
         //! [0]
 
         //! [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;
                 }
             }
         }
         //! [1]
 
         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
         }
     }
 }