PlayerMovements.cs

using UnityEngine;
using System.Collections;

public class PlayerMovements : MonoBehaviour{
	// Normal Movements Variables
	public float walkSpeed = 5f;

	private float currentSpeed;
	private Rigidbody2D rb2d;


	public float touchRadius = 10;
	public float maxTouchRadius = 90; 
	private bool fingerPlaced;
	private Vector3 placedPos;
	private Vector3 pos;
	private Vector3 dist;
	private Vector2 newVel;
	private bool shouldMove = false;
	private bool movingHorizontal = true;

	void Awake() {
		Application.targetFrameRate = 25;
	}


	void Start()
	{
		rb2d = GetComponent<Rigidbody2D> ();
	}
		
	void Update(){
		if (Input.GetMouseButtonDown(0) && !fingerPlaced) {
				fingerPlaced = true;
				placedPos = Input.mousePosition;
				pos = placedPos;
		}
		if (fingerPlaced) {

			newVel = Vector2.zero;

			pos = Input.mousePosition;
			dist = placedPos - pos;
			dist.x = -Mathf.Clamp (dist.x, -maxTouchRadius, maxTouchRadius) / maxTouchRadius;
			dist.y = -Mathf.Clamp (dist.y, -maxTouchRadius, maxTouchRadius) / maxTouchRadius;

			if ((dist.x * maxTouchRadius >= touchRadius) || (dist.x * maxTouchRadius <= -touchRadius)) {
				movingHorizontal = true;

				if (dist.x > 0) {
					newVel.x = dist.x * walkSpeed;
				}else if(dist.x < 0) {
					newVel.x = dist.x * walkSpeed;
				}
			}
			if ((dist.y * maxTouchRadius >= touchRadius) || (dist.y * maxTouchRadius <= -touchRadius)) {
				//move Y pos
				movingHorizontal = false;
				if (dist.y > 0) {
					newVel.y = dist.y * walkSpeed;
				}else if(dist.y < 0) {
					newVel.y = dist.y * walkSpeed;
				}
			}
			rb2d.velocity = newVel;
		}
		if (Input.GetMouseButtonUp(0)) {
				//cleanup
			fingerPlaced = false;
			placedPos = new Vector3();
			rb2d.velocity = new Vector2 ();
		}
		if (fingerPlaced) {
			if (movingHorizontal) {
				rb2d.velocity = new Vector2(newVel.x, 0.0f);
			} else {
				rb2d.velocity = new Vector2(0.0f, newVel.y);
			}
		}
	}
	void FixedUpdate()
	{
		
	}
}