gistfile1.cs

using UnityEngine;
using System.Collections;

public class MapGenerator : MonoBehaviour {

    Sprite[] tileSprites;
    int[,] tileMap;
    float[,] values;
    int width, height;

	// Use this for initialization
	void Start () {
        width = height = 100;
        tileSprites = Resources.LoadAll<Sprite>("Sprites/tiles");
        tileMap = new int[width, height];
        values = new float[width, height];

        float shiftX = Random.Range(0, 100);
        float shiftY = Random.Range(0, 100);

        // noise manipulator values
        float a, b, c, d;
        a = 0.05f;
        b = 1.06f;
        c = 1.3f;

        for (int y = 0; y < height; y++)
        {
            for (int x = 0; x < width; x++)
            {
                float nx = (float)x / width - 0.5f;
                float ny = (float)y / height - 0.5f;
                Vector2 pos = new Vector2(nx, ny);

                d = 2 * Mathf.Max(Mathf.Abs(pos.x), Mathf.Abs(pos.y));

                float e = Mathf.PerlinNoise(nx, ny);
                e += 0.5f * Mathf.PerlinNoise(2 * nx, 2 * ny);
                e += 0.25f * Mathf.PerlinNoise(4 * nx, 4 * ny);

                e = (e + a) * (1 - b * Mathf.Pow(d, c));

                print(e);
                values[y, x] = e;
            }
        }

        GenerateWater();
        GenerateLand();
        InstantiateTiles();
	}
	
	// Update is called once per frame
	void Update () {
	
	}

    void InstantiateTiles()
    {
        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < height; y++)
            {
                GameObject go = new GameObject();
                SpriteRenderer renderer = go.AddComponent<SpriteRenderer>();
                renderer.sprite = tileSprites[tileMap[x, y]];
                go.transform.position = new Vector3(x, y, 0);
            }
        }
    }

    void GenerateWater()
    {
        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < height; y++)
            {
                tileMap[x, y] = 387;
            }
        }
    }

    void GenerateLand()
    {
        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < height; y++)
            {
                if (values[x, y] < 0.1f)
                {
                    continue;
                }
                else
                {
                    tileMap[x, y] = 70;
                }
            }
        }
    }
}