// File "Shape2D.as"

package  
{
	import Box2D.Common.Math.b2Vec2;
	import flash.display.Sprite;
	import flash.display.Stage;

	/**
	 * Shape.as
	 * Created On:	12/03/2012 17:47
	 */
	
	public class Shape2D 
	{
		public var verts:Vector.<b2Vec2>;
		public var position:b2Vec2;
		public var angle:Number;
		
		public function Shape2D(vertices:Vector.<b2Vec2>, position:b2Vec2, angle:Number) 
		{
			// INITIALZING FIELDS:
			this.verts		= vertices;
			this.position	= position;
			this.angle		= angle;
		}
		public function getOBB():Vector.<b2Vec2>
		{
			// RETURNS THE ACTUAL VERTS RELATIVE TO THE SHAPES POSITION AND ROTATION:
			var obb:Vector.<b2Vec2> = new Vector.<b2Vec2>();
			var radians:Number = angle * (Math.PI / 180);
			for (var v:int = 0; v < verts.length; v++)
			{
				// COPYING CURRENT VERT TO TEMPORARY VARIABLE:
				var vert:b2Vec2 = verts[v].Copy();
				
				// ROTATING VERTICES
				var xPos:Number = vert.x * Math.cos(radians) - vert.y * Math.sin(radians) + position.x;
				var yPos:Number = vert.x * Math.sin(radians) + vert.y * Math.cos(radians) + position.y;
				obb.push(new b2Vec2(xPos, yPos));
			}
			return obb;
		}
		public function draw(canvas:Sprite, fill:Boolean = false):void
		{
			var obb:Vector.<b2Vec2> = getOBB();
			// DRAWING VERTICES:
			if (fill)
			{
				canvas.graphics.beginFill(0xFF0000);
			}
			canvas.graphics.lineStyle(2, 0xFF0000);
			canvas.graphics.moveTo(obb[0].x, obb[0].y);
			for (var i:int = 1; i < obb.length; i++)
			{
				canvas.graphics.lineTo(obb[i].x, obb[i].y);
			}
			canvas.graphics.lineTo(obb[0].x, obb[0].y);
			if (fill)
			{
				canvas.graphics.endFill();
			}
		}
	}
}