forked from: forked from: code on 2008-12-24

by jasu 24 Dec 2008

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// forked from jasu's forked from: code on 2008-12-24
// forked from jasu's code on 2008-12-24
// write as3 code here..
package{
	import flash.display.*;
	import flash.events.*;
	import flash.geom.*;
 
	public class CubeRotationExample extends Sprite {
		
		private static const EDGE	:Number = 40;		//edge length
		private var mtxWorld		:Matrix3D;			//world transform matrix
		private var vCube			:Vector.<Number>;	//cube points
		private var vFlatCube		:Vector.<Number>;	//projected cube points
		private var vUVT			:Vector.<Number>;	//uvt data
		private var vIndicies		:Vector.<int>;		//triangle indicies
		private var sprCube			:Sprite;			//canvas object
		
		public function CubeRotationExample(){
			// setup and initialize
			stage.align = StageAlign.TOP_LEFT;
			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.quality = StageQuality.BEST;			
			
			mtxWorld = new Matrix3D();
			vCube = Vector.<Number>([	EDGE,EDGE,-EDGE,
				 						EDGE,-EDGE,-EDGE, 
										-EDGE,-EDGE,-EDGE,
										-EDGE,EDGE,-EDGE, 
										EDGE,EDGE,EDGE,
										EDGE,-EDGE,EDGE,
										-EDGE,-EDGE,EDGE,
										-EDGE,EDGE,EDGE
										]);
			vFlatCube = new Vector.<Number>(16);
			vUVT = new Vector.<Number>(24);
			vIndicies = Vector.<int>([0,1,2, 2,3,0, 4,7,6, 6,5,4, 0,4,5, 5,1,0, 1,5,6, 6,2,1, 2,6,7, 7,3,2, 4,0,3, 3,7,4]);
			
			sprCube = new Sprite();
			addChild(sprCube);

			addEventListener(Event.ENTER_FRAME, onEnterFrame);
		}
		
		private function onEnterFrame(eo:Event):void {
			// center the cube 
			sprCube.x = stage.stageWidth/2;
			sprCube.y = stage.stageHeight/2;
			
			// rotate the transform matrix
			mtxWorld.appendRotation(2, new Vector3D(0,1,0));
			mtxWorld.appendRotation(2, new Vector3D(0,0,1));
			mtxWorld.appendRotation(2, new Vector3D(1,0,0));
			
			// project 3D data to 2D plane
			Utils3D.projectVectors(mtxWorld, vCube, vFlatCube, vUVT);
			
			// draw the cube using cube data
			sprCube.graphics.clear();
			sprCube.graphics.beginFill(0xFF00FF);
			sprCube.graphics.lineStyle(1,0xFF0000,1);
			sprCube.graphics.drawTriangles(vFlatCube, vIndicies, null, TriangleCulling.POSITIVE);
			sprCube.graphics.endFill();
		}
	} 
}