qtdeclarative/examples/quick/particles/affectors/content/customaffector.qml

/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

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
        }

        //! [0]
        Affector {
            width: parent.width
            height: parent.height - 100
            onAffectParticles: (particles, dt) => {
                //Wobbly movement
                for (var i=0; i<particles.length; i++) {
                    var particle = particles[i];
                    particle.rotation += particle.vx * 0.15 * dt;
                    particle.update = true;
                }
            }
        }
        //! [0]

        //! [1]
        Affector {//Custom Friction, adds some 'randomness'
            x: -60
            width: parent.width + 120
            height: 100
            anchors.bottom: parent.bottom
            onAffectParticles: (particles, dt) => {
                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
        }
    }
}