BG1-A

Walkabout.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Walkabout : MonoBehaviour {

	public float acceleration = 1;
	public float friction;
	public float radius;
	Vector3 velocity;

	// Use this for initialization
	void Start () {
		
	}
	
	// Update is called once per frame
	void Update () {

		if ( Input.GetKey( KeyCode.RightArrow ) ){
			velocity += Vector3.right * acceleration * Time.deltaTime;
		}
		if ( Input.GetKey( KeyCode.LeftArrow ) ){
			velocity += Vector3.left * acceleration * Time.deltaTime;
		}
		if ( Input.GetKey( KeyCode.UpArrow ) ){
			velocity += Vector3.up * acceleration * Time.deltaTime;
		}
		if ( Input.GetKey( KeyCode.DownArrow ) ){
			velocity += Vector3.down * acceleration * Time.deltaTime;
		}

		velocity -= velocity * friction * Time.deltaTime;

		RaycastHit2D result = Physics2D.CircleCast(transform.position, radius, velocity.normalized);

		if (result.collider != null){
			if (Vector3.Distance(transform.position, result.point)<radius+velocity.magnitude*Time.deltaTime){
				velocity = Vector3.zero;
			}
		}

		transform.position += velocity * Time.deltaTime;

	}
}