/
Crab.cs
69 lines (63 loc) · 1.82 KB
/
Crab.cs
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using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using UnityEngine;
[RequireComponent(typeof(Rigidbody2D))]
[RequireComponent(typeof(CapsuleCollider2D))]
public class Crab : MonoBehaviour
{
private Rigidbody2D rb;
private float speed = 4;
// Start is called before the first frame update
void Start()
{
rb = GetComponent<Rigidbody2D>();
// Physics enginge will not rotate Crab
rb.freezeRotation = true;
// remove gravity
rb.gravityScale = 0;
rb.velocity = new Vector2(speed, 0);
}
// Update is called once per frame
void FixedUpdate()
{
// small chance of rotation
if (Random.Range(0, 100) < 10)
{
if (Random.Range(0, 2) == 0)
{
// turn left
rb.rotation += 5;
}
else
{
// turn right
rb.rotation -= 5;
}
}
// reset speed
float angleRadians = rb.rotation * Mathf.PI / 180f;
float xSpeed = Mathf.Cos(angleRadians) * speed;
float ySpeed = Mathf.Sin(angleRadians) * speed;
rb.velocity = new Vector2(xSpeed, ySpeed);
}
private void OnCollisionStay2D(Collision2D collision)
{
// random left or right
if (Random.Range(0, 2) == 0)
{
// turn left
rb.rotation += Random.Range(40, 90);
}
else
{
// turn right
rb.rotation -= Random.Range(40, 90);
}
// reset speed
float angleRadians = rb.rotation * Mathf.PI / 180f;
float xSpeed = Mathf.Cos(angleRadians) * speed;
float ySpeed = Mathf.Sin(angleRadians) * speed;
rb.velocity = new Vector2(xSpeed, ySpeed);
}
}