Transform with drawTriangles on 2009-1-14

by mtok 14 Jan 2009

Embed

package  
{
	import flash.display.Bitmap;
	import flash.display.Loader;
	import flash.display.LoaderInfo;
	import flash.display.MovieClip;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.geom.Point;
	import flash.net.URLRequest;
	import flash.system.LoaderContext;
	[SWF(width="465", height="465", frameRate="24", backgroundColor="0xFFFFFF")]
	public class ErasticPoint extends MovieClip
	{
		private var numRow:int = 31;
		private var numCol:int = 31;
		private var bmp:Bitmap;
		private var vertices:Vector.<Number>;
		private var uvtData:Vector.<Number>;
		private var indices:Vector.<int>;
		private var pts:Vector.<Point>;
		
		public function ErasticPoint() 
		{
			addEventListener(Event.ADDED_TO_STAGE, addedToStage);
		}
		
		private function addedToStage(e:Event):void 
		{
			removeEventListener(e.type, arguments.callee);
			
			var l:Loader = new Loader();
			var c:LoaderContext = new LoaderContext(true);
			l.contentLoaderInfo.addEventListener(Event.COMPLETE, loaderCompleteHandler);
			l.load(new URLRequest('http://www.matzmtok.com/wonderfl/black_QP.png'), c);
		}
		
		private function loaderCompleteHandler(e:Event):void 
		{
			var li:LoaderInfo = e.target as LoaderInfo;
			bmp = li.content as Bitmap;
			
			var w:Number = bmp.bitmapData.width;
			var h:Number = bmp.bitmapData.height;
			var iw:Number = w / numCol;
			var ih:Number = h / numRow;
			pts = new Vector.<Point>();
			vertices = new Vector.<Number>();
			uvtData = new Vector.<Number>();
			indices = new Vector.<int>();
			for ( var j:int = 0; j < numRow + 1; j++) {
				for (var i:int = 0; i < numCol + 1; i++) {
					pts.push(new Point(i * iw, j * ih));
					vertices.push(i * iw);
					vertices.push(j * ih);
					uvtData.push(i * iw / w);
					uvtData.push(j * ih / h);
				}
			}
			for ( j = 0; j < numRow; j++) {
				for ( i = 0; i < numCol; i++) {
					indices.push( 
						 j      * (numCol+1) + i, 
						 j      * (numCol+1) + i + 1,
						(j + 1) * (numCol+1) + i,
						 j      * (numCol+1) + i + 1,
						(j + 1) * (numCol+1) + i,
						(j + 1) * (numCol+1) + i + 1);
				}
			}
			
			addEventListener(Event.ENTER_FRAME, enterFrame);
		}
		
		private function enterFrame(e:Event):void 
		{
			var f:Point;
			graphics.clear();
			for ( var i:int = 0; i < pts.length; i++) {
				f = getForce(pts[i]);
				vertices[int(i * 2)] = pts[i].x + f.x;
				vertices[int(i * 2) + 1] = pts[i].y + f.y;
			}
			graphics.beginBitmapFill(bmp.bitmapData);
			graphics.drawTriangles(vertices, indices, uvtData);
			graphics.endFill();
		}
		private function getForce(p:Point):Point {
			var f:Point = new Point();
			var dx:Number = p.x - mouseX;
			var dy:Number = p.y - mouseY;
			var pow:Number = dx * dx + dy * dy;

			if (pow < 20000) {
				pow = 20000;
			}
			f.x = dx;
			f.y = dy;
			f.normalize(1000000/pow);

			return f;
		}
		
	}
}