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

public class RandomMove : MonoBehaviour {

	private Vector3 velocity = Vector3.zero;
	private float speed = 8;
	private Vector3 target = Vector3.zero;
	private void Update()
	{

		if (Random.value < 0.01f)
			target = transform.position + Quaternion.Euler(0, Random.value * 360, 0) * Vector3.right * 10;
		Vector3 direct = target - transform.position;
		direct.y = 0;												//防止y方向移动
		if (direct.sqrMagnitude > 1)
		{
			transform.rotation = Quaternion.LookRotation(direct);	//改变朝向
			velocity = direct.normalized * speed / 3;
		}

		velocity -= transform.GetComponent<Rigidbody>().velocity;
		velocity.y = 0;

		//速度过大时减速
		if (velocity.sqrMagnitude > speed * speed)
			velocity = velocity.normalized * speed;

		transform.GetComponent<Rigidbody>().AddForce(velocity, ForceMode.VelocityChange);
		velocity = Vector3.zero;
	}
}