Meatboy Controller Script

/********************************************************
 * 2D Meatboy style controller written entirely by Nyero.
 *
 * Thank you for using this script, it makes me feel all
 * warm and happy inside. ;)
 *                             -Nyero
 *
 * ------------------------------------------------------
 * Notes on usage:
 *     Please don't use the meatboy image, as your some
 * might consider it stealing.  Simply replace the sprite
 * used, and you'll have a 2D platform controller that is
 * very similar to meatboy.
 ********************************************************/
using UnityEngine;
using System.Collections;

public class Controller : MonoBehaviour
{
	public class GroundState
	{
		private GameObject player;
		private float  width;
		private float height;
		private float length;

		//GroundState constructor.  Sets offsets for raycasting.
		public GroundState(GameObject playerRef)
		{
			player = playerRef;
			width = player.collider2D.bounds.extents.x + 0.1f;
			height = player.collider2D.bounds.extents.y + 0.2f;
			length = 0.05f;
		}

		//Returns whether or not player is touching wall.
		public bool isWall()
		{
			bool left = Physics2D.Raycast(new Vector2(player.transform.position.x - width, player.transform.position.y), -Vector2.right, length);
			bool right = Physics2D.Raycast(new Vector2(player.transform.position.x + width, player.transform.position.y), Vector2.right, length);

			if(left || right)
				return true;
			else
				return false;
		}

		//Returns whether or not player is touching ground.
		public bool isGround()
		{
			bool bottom1 = Physics2D.Raycast(new Vector2(player.transform.position.x, player.transform.position.y - height), -Vector2.up, length);
			bool bottom2 = Physics2D.Raycast(new Vector2(player.transform.position.x + (width - 0.2f), player.transform.position.y - height), -Vector2.up, length);
			bool bottom3 = Physics2D.Raycast(new Vector2(player.transform.position.x - (width - 0.2f), player.transform.position.y - height), -Vector2.up, length);
			if(bottom1 || bottom2 || bottom3)
				return true;
			else
				return false;
		}

		//Returns whether or not player is touching wall or ground.
		public bool isTouching()
		{
			if(isGround() || isWall())
				return true;
			else
				return false;
		}

		//Returns direction of wall.
		public int wallDirection()
		{
			bool left = Physics2D.Raycast(new Vector2(player.transform.position.x - width, player.transform.position.y), -Vector2.right, length);
			bool right = Physics2D.Raycast(new Vector2(player.transform.position.x + width, player.transform.position.y), Vector2.right, length);

			if(left)
				return -1;
			else if(right)
				return 1;
			else
				return 0;
		}
	}

	//Feel free to tweak these values in the inspector to perfection.  I prefer them private.
	public float    speed = 14f;
	public float    accel = 6f;
	public float airAccel = 3f;
	public float     jump = 14f;  //I could use the "speed" variable, but this is only coincidental in my case.  Replace line 89 if you think otherwise.

	private GroundState groundState;

	void Start()
	{
		//Create an object to check if player is grounded or touching wall
		groundState = new GroundState(transform.gameObject);
	}

	private Vector2 input;

	void Update()
	{
		//Handle input
		if(Input.GetKey(KeyCode.LeftArrow))
			input.x = -1;
		else if(Input.GetKey(KeyCode.RightArrow))
			input.x = 1;
		else
			input.x = 0;

		if(Input.GetKeyDown(KeyCode.Space))
			input.y = 1;

		//Reverse player if going different direction
		transform.localEulerAngles = new Vector3(transform.localEulerAngles.x, (input.x == 0) ? transform.localEulerAngles.y : (input.x + 1) * 90, transform.localEulerAngles.z);
	}

	void FixedUpdate()
	{
		rigidbody2D.AddForce(new Vector2(((input.x * speed) - rigidbody2D.velocity.x) * (groundState.isGround() ? accel : airAccel), 0)); //Move player.
		rigidbody2D.velocity = new Vector2((input.x == 0 && groundState.isGround()) ? 0 : rigidbody2D.velocity.x, (input.y == 1 && groundState.isTouching()) ? jump : rigidbody2D.velocity.y); //Stop player if input.x is 0 (and grounded) and jump if input.y is 1

		if(groundState.isWall() && !groundState.isGround() && input.y == 1)
			rigidbody2D.velocity = new Vector2(-groundState.wallDirection() * speed * 0.75f, rigidbody2D.velocity.y); //Add force negative to wall direction (with speed reduction)

		input.y = 0;
	}
}