Unity 2d make four directions (Up, Down, Right, Left. like RPG games) GUI buttons. Please help me.

First of all, my English ability just a little.
I made character and character movement.
(Also made Animation, Animator. Four directions)
I made to move the keyboard,

Up - keyboard “W”
Down - keyboard “S”
Right - keyboard “D”
Left - keyboard “A”

made in this format(this is a PlayerControllers Script).
Format is created as a keyboard works well.
But, How to create a GUI button, I do not know what to add, what to PlayerControllers Script.
I found roughly, there is a movie that uses GetAxisRaw and Rigidbody2D… I do not know at all.
Here are attached to PlayerControllers Script.

using UnityEngine;
using System.Collections;

public class PlayerControllers: MonoBehaviour {
	
	public Animator anim;
	public float speed;




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






	// Update is called once per frame
	void Update () {


		if (Input.GetKey (KeyCode.D)) 
		{
			transform.Translate(Vector2.right * speed);
		}
		
		if (Input.GetKey (KeyCode.A)) 
		{
			transform.Translate(-Vector2.right * speed);
		}
		if (Input.GetKey (KeyCode.W)) 
		{
			transform.Translate(Vector2.up * speed);
		}
		if (Input.GetKey (KeyCode.S)) 
		{
			transform.Translate(-Vector2.up * speed);
		}





		
		if (Input.GetKey (KeyCode.A)) {
			anim.SetBool ("Left", true);
			anim.SetBool ("Right", false);
			anim.SetBool ("Up", false);
			anim.SetBool ("Down", false);
		}
		if (Input.GetKey (KeyCode.S)) {
			anim.SetBool ("Down", true);
			anim.SetBool ("Up", false);
			anim.SetBool ("Left", false);
			anim.SetBool ("Right", false);
			
		}
		if (Input.GetKey (KeyCode.D)) {
			anim.SetBool ("Right", true);
			anim.SetBool ("Left", false);
			anim.SetBool ("Up", false);
			anim.SetBool ("Down", false);
		}
		if (Input.GetKey (KeyCode.W)) {
			anim.SetBool ("Up", true);
			anim.SetBool ("Down", false);
			anim.SetBool ("Left", false);
			anim.SetBool ("Right", false);
		}
		
		
		
		if(Input.GetKey (KeyCode.A)){
			anim.SetBool("Player_Left", true);
		}
		else{
			anim.SetBool ("Player_Left", false);
		}
		
		
		
		if(Input.GetKey (KeyCode.S)){
			anim.SetBool("Player_Down", true);
		}
		else{
			anim.SetBool ("Player_Down", false);
		}
		
		
		
		if(Input.GetKey (KeyCode.D)){
			anim.SetBool("Player_Right", true);
		}
		else{
			anim.SetBool ("Player_Right", false);
		}
		
		
		
		if(Input.GetKey (KeyCode.W)){
			anim.SetBool("Player_Up", true);
		}
		else{
			anim.SetBool ("Player_Up", false);
		}
		
		
	}
	
	
}

I would want to ask. To create a GUI button of the four directions,
and I want to move character to four directions (Up, Down, Right, Left), but it doesn’t work.
I do not know what to do in PlayerControllers Script added.
Also attach a Game Scene.

54646-picture.jpg

Please help me.

Thank you.

If you go to
Create > UI > Button

You can change the OnClick() section on the right to run any function in your code. For example, if you make a function called ChangeDirectionOfCharacter (or whatever you want to call it), set that function to the OnClick event then make a function something like this:

function ChangeDirectionOfCharacter(dir : String){
      if(dir=="up"){
            Transform.translate(Vector2.Up * speed);
      }
     //continue other "if statements" for other directions.
}

You need to change the argument in the editor too. It will look like this (or similar):