105 lines
3.6 KiB
C#
105 lines
3.6 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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namespace MoreMountains.Tools
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{
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/// <summary>
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/// Prevents fast moving objects from going through colliders by casting a ray backwards after each movement
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/// </summary>
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[AddComponentMenu("More Mountains/Tools/Movement/MMPreventPassingThrough2D")]
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public class MMPreventPassingThrough2D : MonoBehaviour
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{
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/// the layer mask to search obstacles on
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public LayerMask ObstaclesLayerMask;
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/// the bounds adjustment variable
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public float SkinWidth = 0.1f;
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public bool RepositionRigidbody = true;
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[Header("Debug")]
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[MMReadOnly]
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public RaycastHit2D Hit;
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protected float _smallestBoundsWidth;
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protected float _adjustedSmallestBoundsWidth;
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protected float _squaredBoundsWidth;
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protected Vector3 _positionLastFrame;
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protected Rigidbody2D _rigidbody;
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protected Collider2D _collider;
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protected Vector2 _lastMovement;
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protected float _lastMovementSquared;
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/// <summary>
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/// On Start we initialize our object
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/// </summary>
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protected virtual void Start()
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{
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Initialization ();
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}
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/// <summary>
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/// Grabs the rigidbody and computes the bounds width
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/// </summary>
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protected virtual void Initialization()
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{
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_rigidbody = GetComponent<Rigidbody2D>();
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_positionLastFrame = _rigidbody.position;
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_collider = GetComponent<Collider2D>();
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_smallestBoundsWidth = Mathf.Min(Mathf.Min(_collider.bounds.extents.x, _collider.bounds.extents.y), _collider.bounds.extents.z);
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_adjustedSmallestBoundsWidth = _smallestBoundsWidth * (1.0f - SkinWidth);
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_squaredBoundsWidth = _smallestBoundsWidth * _smallestBoundsWidth;
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}
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/// <summary>
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/// On Enable, we initialize our last frame position
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/// </summary>
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protected virtual void OnEnable()
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{
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_positionLastFrame = this.transform.position;
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}
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/// <summary>
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/// On fixedUpdate, checks the last movement and if needed casts a ray to detect obstacles
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/// </summary>
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protected virtual void Update()
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{
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_lastMovement = this.transform.position - _positionLastFrame;
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_lastMovementSquared = _lastMovement.sqrMagnitude;
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// if we've moved further than our bounds, we may have missed something
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if (_lastMovementSquared > _squaredBoundsWidth)
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{
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float movementMagnitude = Mathf.Sqrt(_lastMovementSquared);
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// we cast a ray backwards to see if we should have hit something
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RaycastHit2D hitInfo = MMDebug.RayCast(_positionLastFrame, _lastMovement.normalized, movementMagnitude, ObstaclesLayerMask, Color.blue, true);
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if (hitInfo.collider != null)
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{
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if (hitInfo.collider.isTrigger)
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{
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hitInfo.collider.SendMessage("OnTriggerEnter2D", _collider, SendMessageOptions.DontRequireReceiver);
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}
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if (!hitInfo.collider.isTrigger)
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{
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Hit = hitInfo;
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this.gameObject.SendMessage("PreventedCollision2D", Hit, SendMessageOptions.DontRequireReceiver);
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if (RepositionRigidbody)
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{
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this.transform.position = hitInfo.point - (_lastMovement / movementMagnitude) * _adjustedSmallestBoundsWidth;
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_rigidbody.position = hitInfo.point - (_lastMovement / movementMagnitude) * _adjustedSmallestBoundsWidth;
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}
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}
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}
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}
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_positionLastFrame = this.transform.position;
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}
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}
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}
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