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C++ Backend Charts Demo App

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 import QtQuick 2.1
 import QtQuick.Window 2.1

 Effect {
     id: root
     divider: false
     parameters: ListModel {
         ListElement {
             name: "Radius"
             value: 0.5
         }
         ListElement {
             name: "Diffraction"
             value: 0.5
         }
         onDataChanged: updateParameters()
     }

     function updateParameters()
     {
         radius   = parameters.get(0).value * 100;
         diffractionIndex = parameters.get(1).value;
     }

     property real posX: -1
     property real posY: -1
     property real pixDens: Screen.pixelDensity

     QtObject {
         id: d
         property real oldTargetWidth: root.targetWidth
         property real oldTargetHeight: root.targetHeight
     }

     // Transform slider values, and bind result to shader uniforms
     property real radius: 0.5 * 100
     property real diffractionIndex: 0.5

     onTargetWidthChanged: {
         if (posX == -1)
             posX = targetWidth / 2
         else if (d.oldTargetWidth != 0)
             posX *= (targetWidth / d.oldTargetWidth)
         d.oldTargetWidth = targetWidth
     }

     onTargetHeightChanged: {
         if (posY == -1)
             posY = targetHeight / 2
         else if (d.oldTargetHeight != 0)
             posY *= (targetHeight / d.oldTargetHeight)
         d.oldTargetHeight = targetHeight
     }

     fragmentShaderFilename: "magnify.fsh"

     MouseArea {
         anchors.fill: parent