Forked from:: paq's QuickBox2D練習

forked from: QuickBox2D練習

forked:3
favorite:5
lines:83
license : MIT License
modified : 2010-02-06 04:23:00

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// forked from paq's QuickBox2D練習
package 
{
	import Box2D.Common.Math.b2Vec2;
	import Box2D.Dynamics.Joints.b2RevoluteJoint;
	import com.actionsnippet.qbox.*;
	import flash.display.MovieClip;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.geom.Matrix;
	
	[SWF(width = 465, height = 465, backgroundColor = 0x333333, frameRate = 60)]
	public class Main extends MovieClip
	{
		private var sim:QuickBox2D;
		private var canvas:MovieClip;
		private var dx:Number = 0;
		private var dy:Number = 0;
		private var time:Number = 0;
		private var scale:Number = 1;
		private var scaleDest:Number = 1.0;
		private var currQuick:QuickObject;
		private var xx:Number = 0;
		private var yy:Number = 0;
		
		public function Main():void 
		{
			if (stage) init();
			else addEventListener(Event.ADDED_TO_STAGE, init);
		}
		
		private function init(e:Event = null):void 
		{
			removeEventListener(Event.ADDED_TO_STAGE, init);
			
			canvas = new MovieClip();
			addChild(canvas);
			
			sim = new QuickBox2D(canvas, {debug:false});
			//sim.worldAABB.upperBound = new b2Vec2(3000, 20);
			
			sim.addBox( { x:50, y:15.5, width:100, height:1, density:0 } );
			sim.addBox( { x:60, y:15.5, width:10, height:1, angle:-0.5, density:0 } );
			
			var body:QuickObject = sim.addBox( { x:2.5, y:13, width:4, height:1 } );
			var wheelA:QuickObject = sim.addCircle( { x:1, y:14, radius:0.5 } );
			var wheelB:QuickObject = sim.addCircle( { x:4, y:14, radius:0.5 } );
			sim.setDefault({type:"revolute", enableMotor:true, maxMotorTorque:250});
			var jointA:b2RevoluteJoint = sim.addJoint( { a:body.body, b:wheelA.body, x1:wheelA.x, y1:wheelA.y } ).joint as b2RevoluteJoint;
			var jointB:b2RevoluteJoint = sim.addJoint( { a:body.body, b:wheelB.body, x1:wheelB.x, y1:wheelB.y } ).joint as b2RevoluteJoint;
			jointA.SetMotorSpeed(5);
			jointB.SetMotorSpeed(5);
			sim.setDefault({});
			
			currQuick = body;
			
			var domino:Array = []
			for (var i:int = 0; i < 20; i++) 
			{
				domino.push(sim.addBox( { x:20 + i, y:14, width:0.15, height:1+i*0.1 } ));
			}
			
			var ball:QuickObject = sim.addCircle( { x:50, y:15.5, radius:1, restitution:1 } );
			
			sim.addTimeStepSequence({ time:240, callback:camera, args:[domino[0], 1.5] },
									{ time:480, callback:camera, args:[domino[4], 0.7, 0, -130] },
									{ time:700, callback:camera, args:[body, 1] },
									{ time:930, callback:camera, args:[ball, 1.2] }
									);
									
			sim.start();
			sim.mouseDrag();
			
			addEventListener(Event.ENTER_FRAME, loop);
			loop()
		}
		
		private function loop(e:Event = null):void 
		{
			scale += (scaleDest - scale) * 0.2;
			dx += (currQuick.x * 30+xx - dx) * 0.2;
			dy += (currQuick.y * 30+yy - dy) * 0.2;
			var m:Matrix = canvas.transform.matrix;
			m.identity();
			m.translate(-dx+100,-dy+200);
			m.scale(scale, scale);
			canvas.transform.matrix = m;
		}   
		
		private function camera(quickObj:QuickObject, scale:Number = -1, x:Number = 0, y:Number = 0):void
		{
			currQuick = quickObj;
			xx = x;
			yy = y;
			if (scale != -1){
				scaleDest = scale;
			}
		}
		
	}
	
}

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