- Qt 5.5
- Qt Quick
- Qt Quick Particles Examples - CustomParticle
- imagecolors.qml Example File
- Qt 5.5.1 Reference Documentation

# imagecolors.qml Example File

particles/customparticle/content/imagecolors.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** 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
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    import QtQuick 2.0
    import QtQuick.Particles 2.0

    Rectangle {
        width: 400
        height: 400
        Rectangle {
            id: root
            color: "white"
            width: 310
            height: 300
            anchors.centerIn: parent
            ParticleSystem { id: sys }
            CustomParticle {
                system: sys
                property real maxWidth: root.width
                property real maxHeight: root.height
                ShaderEffectSource {
                    id: pictureSource
                    sourceItem: picture
                    hideSource: true
                }
                Image {
                    id: picture
                    source: "../../images/starfish_3.png"
                }
                ShaderEffectSource {
                    id: particleSource
                    sourceItem: particle
                    hideSource: true
                }
                Image {
                    id: particle
                    source: "qrc:///particleresources/fuzzydot.png"
                }
                vertexShader:"
                    uniform highp float maxWidth;
                    uniform highp float maxHeight;
                    varying highp vec2 fTex2;
                    varying lowp float fFade;
                    uniform lowp float qt_Opacity;

                    void main() {

                        fTex2 = vec2(qt_ParticlePos.x, qt_ParticlePos.y);
                        //Uncomment this next line for each particle to use full texture, instead of the solid color at the center of the particle.
                        //fTex2 = fTex2 + ((- qt_ParticleData.z / 2. + qt_ParticleData.z) * qt_ParticleTex); //Adjusts size so it's like a chunk of image.
                        fTex2 = fTex2 / vec2(maxWidth, maxHeight);
                        highp float t = (qt_Timestamp - qt_ParticleData.x) / qt_ParticleData.y;
                        fFade = min(t*4., (1.-t*t)*.75) * qt_Opacity;
                        defaultMain();
                    }
                "
                property variant particleTexture: particleSource
                property variant pictureTexture: pictureSource
                fragmentShader: "
                    uniform sampler2D particleTexture;
                    uniform sampler2D pictureTexture;
                    varying highp vec2 qt_TexCoord0;
                    varying highp vec2 fTex2;
                    varying lowp float fFade;
                    void main() {
                        gl_FragColor = texture2D(pictureTexture, fTex2) * texture2D(particleTexture, qt_TexCoord0).w * fFade;
                }"
            }

            Emitter {
                id: emitter
                system: sys
                enabled: false
                lifeSpan: 8000
                maximumEmitted: 4000
                anchors.fill: parent
                size: 16
                acceleration: PointDirection { xVariation: 12; yVariation: 12 }
            }
            MouseArea {
                anchors.fill: parent
                onClicked: emitter.burst(4000);
            }
        }
    }