examples/declarative/particles/customparticle/imagecolors.qml

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  40
  41 import QtQuick 2.0
  42 import QtQuick.Particles 2.0
  43
  44 Rectangle {
  45     width: 400
  46     height: 400
  47     Rectangle {
  48         id: root
  49         color: "white"
  50         width: 310
  51         height: 300
  52         anchors.centerIn: parent
  53         ParticleSystem { id: sys }
  54         CustomParticle {
  55             system: sys
  56             property real maxWidth: root.width
  57             property real maxHeight: root.height
  58             ShaderEffectSource {
  59                 id: pictureSource
  60                 sourceItem: picture
  61                 hideSource: true
  62             }
  63             Image {
  64                 id: picture
  65                 source: "../images/starfish_3.png"
  66             }
  67             ShaderEffectSource {
  68                 id: particleSource
  69                 sourceItem: particle
  70                 hideSource: true
  71             }
  72             Image {
  73                 id: particle
  74                 source: "../images/particle4.png"
  75             }
  76             vertexShader:"
  77                 uniform highp float maxWidth;
  78                 uniform highp float maxHeight;
  79                 varying highp vec2 fTex2;
  80                 varying lowp float fFade;
  81                 uniform lowp float qt_Opacity;
  82
  83                 void main() {
  84                     fTex2 = vec2(qt_ParticlePos.x / maxWidth, qt_ParticlePos.y / maxHeight);
  85                     highp float t = (qt_Timestamp - qt_ParticleData.x) / qt_ParticleData.y;
  86                     fFade = min(t*4., (1.-t*t)*.75) * qt_Opacity;
  87                     defaultMain();
  88                 }
  89             "
  90             property variant particleTexture: particleSource
  91             property variant pictureTexture: pictureSource
  92             fragmentShader: "
  93                 uniform sampler2D particleTexture;
  94                 uniform sampler2D pictureTexture;
  95                 varying highp vec2 qt_TexCoord0;
  96                 varying highp vec2 fTex2;
  97                 varying lowp float fFade;
  98                 void main() {
  99                     gl_FragColor = texture2D(pictureTexture, fTex2) * texture2D(particleTexture, qt_TexCoord0).w * fFade;
 100             }"
 101         }
 102
 103         Emitter {
 104             id: emitter
 105             system: sys
 106             enabled: false
 107             lifeSpan: 8000
 108             maximumEmitted: 4000
 109             anchors.fill: parent
 110             size: 16
 111             acceleration: PointDirection { xVariation: 12; yVariation: 12 }
 112         }
 113         MouseArea {
 114             anchors.fill: parent
 115             onClicked: emitter.burst(4000);
 116         }
 117     }
 118 }