Category Archives: Graphics

3D Ring

By Zevan | May 3, 2010
CLICK HERE TO COPY
Actionscript:
  1. [SWF(width = 500, height=500)]
  2. var ring:MovieClip = createRing();
  3. ring.x = stage.stageWidth / 2;
  4. ring.y = stage.stageHeight / 2;
  5. addChild(ring);
  6.  
  7. function createRing(sectionNum:int = 30):MovieClip{
  8.     var container:MovieClip = new MovieClip();
  9.     container.circles = [];
  10.     container.theta = 0;
  11.     container.thetaDest = 0;
  12.     var step:Number = (Math.PI * 2) / sectionNum;
  13.     for (var i:int = 0; i<sectionNum; i++){
  14.         var c:MovieClip = new MovieClip();
  15.         with (c.graphics){
  16.             lineStyle(0,0x000000);
  17.             beginFill(0xCCCCCC);
  18.             drawCircle(0,0,20);
  19.         }
  20.         c.thetaOffset = step * i;
  21.         container.addChild(c);
  22.         container.circles.push(c);
  23.     }
  24.     container.addEventListener(Event.ENTER_FRAME, onRun);
  25.     return container;
  26. }
  27. function onRun(evt:Event):void {
  28.     var container:MovieClip = MovieClip(evt.currentTarget);
  29.     var num:int = container.circles.length;
  30.     for (var i:int = 0; i<num; i++){
  31.         var c:MovieClip = container.circles[i];
  32.         var angle:Number = container.theta + c.thetaOffset;
  33.         c.x = 200 * Math.cos(angle);
  34.         c.y = 100 * Math.sin(angle);
  35.         c.scaleX = (100 + c.y) / 120 + 0.2;
  36.         c.scaleY = c.scaleX;
  37.     }
  38.     container.circles.sortOn("y", Array.NUMERIC);
  39.     for (i = 0; i<num; i++){
  40.         container.addChild(container.circles[i]);
  41.     }
  42.     if (container.mouseX <-100){
  43.         container.thetaDest -= 0.05;
  44.     }
  45.     if (container.mouseX> 100){
  46.         container.thetaDest += 0.05;
  47.     }
  48.     container.theta += (container.thetaDest  - container.theta) / 12;
  49.    
  50. }

This snippet shows how to create a 3D ring navigation using sine and cosine. Have a look:

Also posted in 3D, MovieClip, UI, arrays, motion, sortOn | Tagged , , | 3 Comments

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 misc, motion | Tagged , , | 5 Comments

Recursion Form

By Zevan | April 5, 2010
CLICK HERE TO COPY
Actionscript:
  1. x = y = 10
  2. graphics.lineStyle(1,0);
  3. drawBox(6);
  4.  
  5. function drawBox(iter:Number=10, count:Number=1, y:Number=0, w:Number=500):void{
  6.        if (count <iter){
  7.                var width:Number = w / count
  8.                for (var i:int = 0; i<count; i++){
  9.                    graphics.drawRect(i * width, width * count/w, width, width);
  10.                }
  11.                count++;
  12.                drawBox(iter, count, y, width);
  13.        }
  14. }

This small snippet just draws this image:

If you have an idea for a short recursive snippet. Feel free to post it in the comments.

Also posted in functions | Tagged , , | 6 Comments

Logistic Map Play

By Zevan | March 27, 2010
CLICK HERE TO COPY
Actionscript:
  1. var offX:Number = 100;
  2. var offY:Number = 300;
  3. var scalarX:Number = 6;
  4. var scalarY:Number = 200;
  5. addEventListener(Event.ENTER_FRAME, onLoop);
  6. function onLoop(evt:Event):void{
  7.     var r:Number = mouseY / 100;
  8.     var xn:Number = (mouseX - 100) / 650;
  9.     var xn1:Number = 0;
  10.     graphics.clear();
  11.     graphics.lineStyle(0,0);
  12.     for (var i:int = 0; i<100; i++){
  13.       xn1 = r * xn * (1 - xn);
  14.       xn = xn1;
  15.       if (i == 0){
  16.         graphics.moveTo(offX+i*scalarX,offY+xn1*scalarY);  
  17.       }else{
  18.         graphics.lineTo(offX+i*scalarX, offY+xn1*scalarY);
  19.       }
  20.     }
  21. }

Whenever I can't decide what kind of snippet to make, I simply go to wikipedia or mathworld for a bit and I always end up with something. I've messed with Logistic Maps before (when learning about strange attractors). This is a simple rendering where the x and y axis change the biotic potential (r) and the starting value for x.

Here is the link I used for reference.


Have a look at the swf (just move your mouse around).

Also posted in Math, misc | Tagged , , | 2 Comments