Category Archives: misc

Circle Fitting

By Zevan | June 5, 2010
CLICK HERE TO COPY
Actionscript:
  1. var circs:Array = []
  2. var circNum:int = 600;
  3. addEventListener(Event.ENTER_FRAME, onAdd);
  4. function onAdd(evt:Event):void {
  5.     if (circs.length <circNum){
  6.         makeGrowable();
  7.     }
  8. }
  9.  
  10. function makeGrowable(){
  11.    
  12.     var s:MovieClip = MovieClip(addChild(new MovieClip()));
  13.     s.x = Math.random() * stage.stageWidth;
  14.     s.y = Math.random() * stage.stageHeight;
  15.     with(s.graphics){
  16.         lineStyle(0,0);
  17.         drawCircle(0,0,10);
  18.     }
  19.     s.scaleX = s.scaleY = 0;
  20.     circs.push(s);
  21.     s.addEventListener(Event.ENTER_FRAME, onScaleUp);
  22. }
  23.  
  24. function onScaleUp(evt:Event):void {
  25.     var c:MovieClip = MovieClip(evt.currentTarget);
  26.     c.scaleX = c.scaleY += 0.05;
  27.     for (var i:int = 0; i<circs.length; i++){
  28.         var circ:MovieClip = circs[i];
  29.         if (circ != c){
  30.             var amt:Number = circ.width/2 + c.width/2;
  31.             var dx:Number = circ.x - c.x;
  32.             var dy:Number = circ.y - c.y;
  33.             var dist:Number = Math.sqrt(dx * dx + dy * dy);
  34.             if (amt> dist){
  35.                 c.removeEventListener(Event.ENTER_FRAME, onScaleUp);
  36.                 if (c.scaleX <0.1){
  37.                     if (contains(c)){
  38.                     removeChild(c);
  39.                     }
  40.                 }
  41.             }
  42.         }
  43.        
  44.     }
  45. }

Circle fitting is one of those things I've never bothered to do... today I figured I'd give it a try and this is what I came up with. I posted it on wonderfl:

Also posted in Graphics, motion | Tagged , , , | 7 Comments

Fish Curve

By Zevan | May 13, 2010
CLICK HERE TO COPY
Actionscript:
  1. var xp:Number = 0;
  2. var yp:Number = 0;
  3. var t:Number = 0;
  4. var a:Number = 200;
  5. x = stage.stageWidth / 2;
  6. y = stage.stageHeight / 2;
  7.  
  8. graphics.lineStyle(0,0x000000);
  9. addEventListener(Event.ENTER_FRAME, onRun);
  10. function onRun(evt:Event):void {
  11.     xp = a * Math.cos(t) - (a * Math.pow(Math.sin(t),2))/Math.sqrt(2);
  12.     yp = a * Math.cos(t) * Math.sin(t);
  13.     if (t == 0){
  14.       graphics.moveTo(xp, yp);
  15.     }else{
  16.       graphics.lineTo(xp, yp);
  17.     }
  18.     t += 0.05;
  19. }

While surfing mathworld I stumbled upon the equation for something called the Fish Curve. This snippet will draw something like this:

Also posted in Math | Tagged , , | Leave a comment

Astroid Pedal Curve Variation

By Zevan | May 12, 2010
CLICK HERE TO COPY
Actionscript:
  1. var xp:Number = 0;
  2. var yp:Number = 0;
  3. var t:Number = 0;
  4. var r:Number = 200;
  5. x = stage.stageWidth / 2;
  6. y = stage.stageHeight / 2;
  7.  
  8. graphics.lineStyle(0,0x000000);
  9. addEventListener(Event.ENTER_FRAME, onRun);
  10. function onRun(evt:Event):void {
  11.     r = 200 * Math.cos(t / 10);
  12.     xp = r * Math.pow(Math.cos(t), 3);
  13.     yp = r * Math.pow(Math.sin(t), 3);
  14.     if (t == 0){
  15.       graphics.moveTo(xp, yp);
  16.     }else{
  17.       graphics.lineTo(xp, yp);
  18.     }
  19.     t += 0.1;
  20. }

While browsing mathworld I decided to do a variation on this curve . The above snippet will draw something like this:

Also posted in Math | Tagged , , | Leave a comment

Circle Mouse Toy

By Zevan | April 24, 2010
CLICK HERE TO COPY
Actionscript:
  1. var circles:Array = [];
  2. for (var i:int = 0; i<30; i++){
  3.     var c:Sprite = makeCircle();
  4.     c.x = stage.stageWidth / 2;
  5.     c.y = stage.stageHeight / 2;
  6.     c.scaleX = 1 + i/2;
  7.     c.scaleY = 0.5 + i/4;
  8.     addChild(c);
  9.     circles.push(c);
  10. }
  11. addEventListener(Event.ENTER_FRAME, onLoop);
  12. function onLoop(evt:Event):void {
  13.     circles[0].y += (mouseY - circles[0].y) / 4;
  14.     for (var i:int = 1; i<circles.length; i++){
  15.         var pre:Sprite = circles[i - 1];
  16.         circles[i].y += (pre.y - circles[i].y) / 4;
  17.     }
  18. }
  19. function makeCircle():Sprite{
  20.     var s:Sprite = new Sprite();
  21.     with(s.graphics){
  22.         lineStyle(0,0x000000);
  23.         drawCircle(0,0,10);
  24.     }
  25.     return s;
  26. }

This morning I woke up with a vision of this simple mouse toy in my head. I decided I might as well code it up... I may do more simple things like this in the next few days, it's relaxing.

Also posted in Graphics, motion | Tagged , , | 5 Comments