Newbie: Ray Tracing problem

programming
1

Hi, it’s me again.

So, defying my ignorance, I tried to make a ray tracing experiment. And of course, it doesn’t work.

I think it’s a pretty basic thing with the drawing api, but I have tried many different options, and none work.

Basically, I want my raytracer to be instantiated when the mouse button is pressed, and when released, it should gently disappear. Even though the first part work, the second doesn’t, and I am not sure why (I have tried all .graphics.clear() possibilities, I think, but I am fairly new to AS3’s magic). I have commented so it helps (and there is stuff I will use later on for collision detection).

Anyway, here’s the code (sorry about the mess, it’s pretty much a what’s in my mind prototype, building on old scraps of code)- any hint as to why it doesn’t work would be awesome! Thanks a bunch!

package
{
	import flash.display.*;
	import flash.events.MouseEvent;
	import flash.events.Event;
	
	public class Testing extends Sprite
	{
		//variables related to the movement of the cone
		public var oldX:Number;
		public var oldY:Number;
		public var vx:Number;
		public var vy:Number;
		public var dx:Number;
		public var dy:Number;
		public var speed:Number;
		public var angle:Number;
		
		//variables to create the raytracer
		public var cone:Sprite; //the sprite that should contain the raytracer
		public var lth:Number = 100; //length of the rays
		public var dpth:Number = 100; //depth of the rays - will use for collision testing
		public var coneAngle:Number = 60; //angle of the tracer
		public var coneAngleStep:Number = 20; //times I check for collision
		public var rayAngle:Number; //in use later
		public var rayAngleRad:Number; //in use later
		
		
		public function Testing()
		{
			init();
		}
		
		private function init():void
		{
			addEventListener(Event.ENTER_FRAME, enterF);
		}
		
		private function enterF(event:Event):void
		{
			stage.addEventListener(MouseEvent.MOUSE_DOWN, accion);
		}
		
		
		private function accion(event:MouseEvent):void
		{
			oldX = mouseX;
			oldY = mouseY;
			stage.addEventListener(MouseEvent.MOUSE_UP, reaccion);
			addEventListener(Event.ENTER_FRAME, annoy);
		}
		
		private function reaccion(event:MouseEvent):void
		{
			removeChild(cone); //once the button is released, the cone should disappear
			removeEventListener(Event.ENTER_FRAME, annoy);
		}
		
		
		private function annoy(event:Event):void
		{
			var vx:Number = oldX - mouseX;
			var vy:Number = oldY - mouseY;
			var speed = Math.sqrt(dx * dx + dy * dy);//will be used later, with collision detection
			
			
			var dx:Number = mouseX - oldX;
			var dy:Number = mouseY - oldY;
			var angle:Number = Math.atan2(dy, dx); //calculate the angle between the mouse and where it moves
			
			var cone:Sprite = new Sprite(); //creating the cone
			cone.graphics.lineStyle(1, 0xff0000); //givin' it some style
	
			for (var x:uint = 0; x <= coneAngle; x += coneAngle/coneAngleStep) //basic raytracer
			{				
				cone.graphics.moveTo(oldX, oldY);
				var rayAngle:Number = angle/(Math.PI/180) - 90*(coneAngle/2) + x;
				var rayAngleRad:Number = rayAngle * Math.PI / 180;
				trace(rayAngleRad);
				cone.graphics.lineTo(oldX - (lth) * Math.cos(rayAngleRad), oldY - (lth) * Math.sin(rayAngleRad));
			}
			addChild(cone);
			
		}
	}
}