Moving,Jumping,Climbing

using UnityEngine;
using System.Collections;


public class PlayerMovement : MonoBehaviour {

    public float speed = 5f;
    public float jumpPower = 8f;

    bool grounded;

    public Transform groundCheck;
    float groundedRadius = 0.2f;
    public LayerMask groundMask;

    public bool inLadder = false;
    float gravity;

    void Start()
    {
        gravity = rigidbody2D.gravityScale;
    }

    void FixedUpdate()
    {
        grounded = Physics2D.OverlapCircle (groundCheck.position, groundedRadius, groundMask);

        float x = Input.GetAxis ("Horizontal");
        rigidbody2D.velocity = new Vector2 (x * speed, rigidbody2D.velocity.y);

        if(inLadder)
        {
            float y = Input.GetAxisRaw ("Vertical");
            rigidbody2D.velocity = new Vector2 (rigidbody2D.velocity.x, y * speed);
            rigidbody2D.gravityScale = 0;
        }
        else
        {
            rigidbody2D.gravityScale = gravity;
            if(Input.GetButtonDown ("Jump") && grounded)
            {
                rigidbody2D.AddForce(new Vector2(0f,jumpPower),ForceMode2D.Impulse);
            }
        }
        inLadder = false;
    }

    void OnTriggerStay2D(Collider2D coll)
    {
        if(coll.collider2D.tag == "Ladder")
        {
            inLadder = true;
        }
    }
}