using UnityEngine;
using System.Collections;

public class Player : MonoBehaviour
{
      private enum PlayerState
      {
          IdleUp, IdleDown, IdleRight, IdleLeft,
          MoveUp, MoveDown, MoveRight, MoveLeft
      }

      private enum Direction
      {
          Up, Down, Right, Left
      }

      private Direction currentDirection;

      private Animator anim;

      // Use this for initialization
      void Start()
      {
          anim = GetComponent<Animator>();

          currentDirection = Direction.Up;
      }

      // Update is called once per frame
      void Update()
      {
          if (Input.GetKey(KeyCode.W))
          {
              anim.SetInteger("state", (int)PlayerState.MoveUp);
              currentDirection = Direction.Up;
          }
          else if (Input.GetKey(KeyCode.S))
          {
              anim.SetInteger("state", (int)PlayerState.MoveDown);
              currentDirection = Direction.Down;
          }
          else
          {
              if (currentDirection == Direction.Up)
              {
                  anim.SetInteger("state", (int)PlayerState.IdleUp);
              }
              else if (currentDirection == Direction.Down)
              {
                  anim.SetInteger("state", (int)PlayerState.IdleDown);
              }
          }
      }
}

using UnityEngine;
using System.Collections;

public class Player : MonoBehaviour
{
      private enum PlayerState
      {
          IdleUp, IdleDown, IdleRight, IdleLeft,
          MoveUp, MoveDown, MoveRight, MoveLeft
      }

      private enum Direction
      {
          Up, Down, Right, Left
      }

      private Direction currentDirection;

      private float currentSpeed = 0.5f;

      private Animator anim;

      // Use this for initialization
      void Start()
      {
          anim = GetComponent<Animator>();

          currentDirection = Direction.Up;
      }

      // Update is called once per frame
      void Update()
      {
          if (Input.GetKey(KeyCode.W))
          {
              anim.SetInteger("state", (int)PlayerState.MoveUp);
              currentDirection = Direction.Up;
              transform.Translate(Vector3.up * currentSpeed * Time.deltaTime);
          }
          else if (Input.GetKey(KeyCode.S))
          {
              anim.SetInteger("state", (int)PlayerState.MoveDown);
              currentDirection = Direction.Down;
              transform.Translate(Vector3.down * currentSpeed * Time.deltaTime);
          }
          else
          {
              if (currentDirection == Direction.Up)
              {
                  anim.SetInteger("state", (int)PlayerState.IdleUp);
              }
              else if (currentDirection == Direction.Down)
              {
                  anim.SetInteger("state", (int)PlayerState.IdleDown);
              }
          }
      }
}