using UnityEngine;
using System.Collections;

public class DrawCross : MonoBehaviour 
{
	private Transform spaceShip;
	public Texture cursor;
	private Material rectMat = null;
	private Vector2 offset;
	void Start()
	{
		spaceShip = GameManager.Instance.spaceShip;
		rectMat = new Material("Shader \"Lines/Colored Blended\" {" +
		                       "SubShader { Pass { " +
		                       "    Blend SrcAlpha OneMinusSrcAlpha " +
		                       "    ZWrite Off Cull Off Fog { Mode Off } " +
		                       "    BindChannels {" +
		                       "      Bind \"vertex\", vertex Bind \"color\", color }" +
		                       "} } }");
		rectMat.hideFlags = HideFlags.HideAndDontSave;
		rectMat.shader.hideFlags = HideFlags.HideAndDontSave;
		offset = new Vector2(cursor.width/2,cursor.height/2);
	}
	void OnGUI()
	{
		Draw();
		/*
		Vector2 pos = (Vector2)Input.mousePosition-offset;
		pos.x = Mathf.Clamp(pos.x,0,Screen.width);
		pos.y = Mathf.Clamp(pos.y,0,Screen.height);
		GUI.DrawTexture(new Rect(pos.x,Screen.height-pos.y,cursor.width,cursor.height),cursor);
		*/
	}
	void Draw()
	{
		if(spaceShip==null)return;
		Vector3 cen = spaceShip.position+spaceShip.forward*1000;
		cen = Camera.main.WorldToScreenPoint(cen);
		//Vector2 cen = new Vector2(Screen.width/2,Screen.height/2);
		float len = 10;
		rectMat.SetPass(0);
		
		GL.PushMatrix();
		try {
			GL.LoadPixelMatrix();

			GL.Begin(GL.LINES);
			GL.Color(Color.white);
			GL.Vertex3(cen.x-len,cen.y,0);
			GL.Vertex3(cen.x+len,cen.y,0);
			GL.End();

		
			GL.Begin(GL.LINES);
			GL.Color(Color.white);
			GL.Vertex3(cen.x,cen.y-len,0);
			GL.Vertex3(cen.x,cen.y+len,0);
			GL.End();
		} finally {
			GL.PopMatrix();
		}
	}
}