point2d.jsc

《JavaScript王者归来》examples.rar

# language: javascript2

package akira.js2{

	import js.lang.JObject;
	import js.lang.System;
	import akira.js2.Vector2D;
	
	//Point is an internal class, it can be visited in this jsc_doc only.
	internal class Point extends JObject
	{
		function Point()
		{
			
		}
	}

	public class Point2D extends Point
	{
		private var x = 0;
		private var y = 0;
		//constants
		const ZERO = 0;

		function Point2D(x, y)
		{
			this.x = x != null ? x : Point2D.ZERO;
			this.y = y != null ? y : Point2D.ZERO;
		}

		public function toString()
		{
			return "(" + this.x + "," + this.y + ")<point>";
		}

		public get X()
		{
			return this.x;
		}

		public get Y()
		{
			return this.y;
		}
		
		//class converter, support as statement
		public function convert(type)
		{
			if(type == Vector2D)
				return new Vector2D(this.x, this.y);
		}

		public function toVector()
		{
			//test as statement
			var v = this as Vector2D;
			return v;
		}

		//pointA + vectorA = moves the point through a path def by vectorA 
		public function add(v:Vector2D)
		{
			return new Point2D(this.x + v.getX(), this.y + v.getY());
		}
		public function sub(v:Vector2D)
		{
			return new Point2D(this.x - v.getX(), this.y - v.getY());
		}
		//pointA - pointB = vector(A, B);
		public function sub(p:Point2D)
		{
			return new Vector2D(this.x - p.getX(), this.y - p.getY());
		}
	}
}