License text 

/*
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 *     this list of conditions and the following disclaimer. 
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package swirlingsquares;

import javafx.scene.*;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
import javafx.stage.*;
import javafx.scene.transform.*;
import javafx.scene.input.*;
import javafx.animation.*;

var angle = 0.0;

var stage:Stage = Stage {
    style: StageStyle.TRANSPARENT
    visible: true
    width: 400
    height: 400
    scene: Scene {
        fill: null
        content:Group {
            translateX: 100
            translateY: 100
            content:for(i in [ 0..10 ]) {
                // here is the magic with binding
                Rectangle {
                    fill: Color.rgb(25 * i, 0, 0, i/10.0)
                    width: 100
                    height: 100
                    arcHeight: 10
                    arcWidth: 10
                    stroke: Color.BLACK
                    strokeWidth: 5
                    transforms: bind [
                        Transform.rotate(-i*36+angle/2,50,50),
                        Transform.translate(angle/4,0),
                    ]
                }
            }
            onMousePressed: function(e:MouseEvent):Void { stage.close(); }
        }
    }
}
var anim = Timeline {
    keyFrames: [
        KeyFrame { time: 0s values: angle => -360 tween Interpolator.EASEBOTH },
        KeyFrame { time: 2s values: angle => 360 tween Interpolator.EASEBOTH },
    ]
    autoReverse: true
    repeatCount: Timeline.INDEFINITE
};
anim.play();