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** This file is part of the test suite of the Qt Toolkit.
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import QtQuick 1.0
import Qt.labs.shaders 1.0

 Rectangle {
     width: 300
     height: 300

     Text {
         id: textLabel
         text: "Hello World"
         anchors.centerIn: parent
         font.pixelSize: 48
     }

     ShaderEffectItem {
         objectName: "effectItem"
         property variant source: ShaderEffectSource { objectName: "effectSource"; sourceItem: textLabel; hideSource: true }
         property real wiggleAmount: 0.01
         anchors.fill: textLabel

         SequentialAnimation on wiggleAmount {
             loops: Animation.Infinite
             NumberAnimation { to: -0.01; duration: 500 }
             NumberAnimation { to: 0.01; duration: 500 }
         }

         fragmentShader: "
         varying highp vec2 qt_TexCoord0;
         uniform sampler2D source;
         uniform highp float wiggleAmount;
         void main(void)
         {
             highp vec2 wiggledTexCoord = qt_TexCoord0;
             wiggledTexCoord.s += sin(4.0 * 3.141592653589 * wiggledTexCoord.t) * wiggleAmount;
             gl_FragColor = texture2D(source, wiggledTexCoord.st);
         }
         "
     }
 }