Actionscript:
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x=stage.stageWidth/2;
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y=stage.stageHeight/2;
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var xp:Number = 0, yp:Number = 0;
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var r:Number = 0, t:Number = 0;
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var speed:Number=.1;
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var range:Number=.2;
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var b:Number = 20;
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var a:Number = b * range;
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var orbit:Number = 2 * Math.PI + speed;
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graphics.lineStyle(0,0x000000);
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addEventListener(Event.ENTER_FRAME, onLoop);
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function onLoop(evt:Event):void {
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var sin:Number=Math.sin(t);
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r = Math.sqrt(4 * b * (a - b * (sin * sin)));
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xp= r * Math.cos(t);
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yp= r * sin;
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if (t==0) {
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graphics.moveTo(xp, yp);
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} else {
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graphics.lineTo(xp, yp);
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}
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t += speed;
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if (t> orbit) {
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range += .5;
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a= b * range;
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t= 0;
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}
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}
The above draws a Hippopede
