using UnityEngine;
using System.Collections.Generic;

public class PolygonGenerator : MonoBehaviour {

	// This first list contains every vertex of the mesh that we are going to render
	public List<Vector3> newVertices = new List<Vector3>();

	// the vertices
	public List<int> newTriangles = new List<int>();
	
	// The UV list is unimportant right now but it tells Unity how the texture is
	// aligned on each polygon
	public List<Vector2> newUV = new List<Vector2>();
	
	
	// A mesh is made up of the vertices, triangles and UVs we are going to define,
	// after we make them up we'll save them as this mesh
	private Mesh mesh;

	private float tUnit = 0.25f;
	private Vector2 tStone = new Vector2 (0, 0);
	private Vector2 tGrass = new Vector2 (0, 1);

	// Use this for initialization
	void Start () {

		float x = transform.position.x;
		float y = transform.position.y;
		float z = transform.position.z;
		
		newVertices.Add( new Vector3 (x  , y  , z ));
		newVertices.Add( new Vector3 (x + 1 , y  , z ));
		newVertices.Add( new Vector3 (x + 1 , y-1 , z ));
		newVertices.Add( new Vector3 (x  , y-1 , z ));
		
		newTriangles.Add(0);
		newTriangles.Add(1);
		newTriangles.Add(3);
		newTriangles.Add(1);
		newTriangles.Add(2);
		newTriangles.Add(3);
		
		newUV.Add(new Vector2 (tUnit * tStone.x, tUnit * tStone.y + tUnit));
		newUV.Add(new Vector2 (tUnit * tStone.x + tUnit, tUnit * tStone.y + tUnit));
		newUV.Add(new Vector2 (tUnit * tStone.x + tUnit, tUnit * tStone.y));
		newUV.Add(new Vector2 (tUnit * tStone.x, tUnit * tStone.y));
		
		mesh.Clear ();
		mesh.vertices = newVertices.ToArray();
		mesh.triangles = newTriangles.ToArray();
		mesh.uv = newUV.ToArray(); // add this line to the code here
		mesh.Optimize ();
		mesh.RecalculateNormals ();
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}