package 
{

	import flash.events.*;
	import flash.display.*;
	import flash.utils.*;

	public class DibujaTangente extends MovieClip
	{
		public var circulo:Sprite;
		public var coseno:Sprite;
		public var seno:Sprite;
		public var hip:Sprite;
		public var tangente:Sprite;
		public var drag:Boolean = false;

		public function DibujaTangente()
		{
			circulo = new Sprite  ;
			seno = new Sprite  ;
			hip = new Sprite  ;
			coseno = new Sprite  ;
			tangente = new Sprite  ;

			dibujarCirculo();
			stage.addEventListener(MouseEvent.MOUSE_DOWN,arrastrarVertice);
			stage.addEventListener(MouseEvent.MOUSE_UP,soltarVertice);
			stage.addEventListener(Event.ENTER_FRAME,dibujarTriangulo);

		}
		public function dibujarCirculo()
		{

			var a:Number = stage.stageWidth / 2;
			var b:Number = stage.stageHeight / 2;
			var radius:Number = 100;

			circulo.graphics.clear();
			circulo.graphics.lineStyle(1,0x000000);
			circulo.graphics.moveTo(a+radius,b);

			for (var i:Number = 0; i <= 360; i++)
			{
				circulo.graphics.lineTo(a + 100 * Math.cos(i * Math.PI / 180),b + 100 * Math.sin(i * Math.PI / 180));
			}
			addChild(circulo);
		}


		public function arrastrarVertice(event:MouseEvent)
		{
			drag = true;
		}
		public function soltarVertice(event:MouseEvent)
		{
			drag = false;
		}
		public function dibujarTriangulo(event:Event)
		{
			if (drag)
			{
				var a:Number = stage.stageWidth / 2;
				var b:Number = stage.stageHeight / 2;
				var radius:Number = 100;
				var angle:Number=Math.atan2((mouseY-b),(mouseX-a));

				coseno.graphics.clear();
				coseno.graphics.lineStyle(1,0x0000AA);
				coseno.graphics.moveTo(a,b);
				coseno.graphics.lineTo(a+100*Math.cos(angle),b);
				addChild(coseno);

				ca_txt.text = (100 * Math.cos(angle)).toString();

				seno.graphics.clear();
				seno.graphics.lineStyle(1,0x00AA00);
				seno.graphics.moveTo(a+100*Math.cos(angle),b);
				seno.graphics.lineTo(a+100*Math.cos(angle),b+100*Math.sin(angle));
				addChild(seno);

				co_txt.text = (-100 * Math.sin(angle)).toString();


				hip.graphics.clear();
				hip.graphics.lineStyle(1,0xFF9933);
				hip.graphics.moveTo(a ,b);
				hip.graphics.lineTo(a+100*Math.cos(angle),b+100*Math.sin(angle));
				addChild(hip);

				h_txt.text = (Math.sqrt((Math.pow(100 * Math.cos(angle),2))+(Math.pow(100 * Math.sin(angle),2)))).toString();
				if (Math.abs(100 * Math.tan(angle)) > 100000)
				{
					tangente.graphics.clear();
					t_txt.text = "infinita";
					ca_txt.text = "0";
				}
				else if (Math.abs(100 * Math.tan(angle)) < 0.01)
				{
					tangente.graphics.clear();
					t_txt.text = "0";
					co_txt.text = "0";				}
				else
				{
					tangente.graphics.clear();
					tangente.graphics.lineStyle(1,0xAA0000);
					tangente.graphics.moveTo(a+100,b);
					tangente.graphics.lineTo(a+100,b+100*Math.tan(angle));
					addChild(tangente);
					t_txt.text = (-100*Math.tan(angle)).toString();
				}
				if ((-angle*180/ Math.PI) > 1)
				{
					a_txt.text=(-angle*180/ Math.PI).toString();
				}
				else
				{
					a_txt.text=(360-angle*180/ Math.PI).toString();

				}

			}
			else
			{
				return;

			}
		}

	}
}