Qt 5.6 | Qt Quick | Qt Quick Particles Examples - CustomParticle | imagecolors.qml Example File

Qt 5.6.2 Reference Documentation

# imagecolors.qml Example File

particles/customparticle/content/imagecolors.qml

      /****************************************************************************
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      ** This file is part of the examples of the Qt Toolkit.
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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);
              }
          }
      }