Assets/Scripts/Terrain/CrumblingTerrain.cs

   1 using System.Collections.Generic;
   2 using UnityEngine;
   3 using UnityEngine.Tilemaps;
   4
   5 public class CrumblingTerrain : MonoBehaviour
   6 {
   7     private class TileToRemove
   8     {
   9         private static Dictionary<Vector3Int, bool> s_tilesRemoved = new Dictionary<Vector3Int, bool>();
  10
  11         public TileBase m_tile;
  12         public Vector3Int m_position;
  13         public float m_lifeTimer;
  14         public float m_flashTimer;
  15
  16         public TileToRemove(TileBase tile, Vector3Int position)
  17         {
  18             s_tilesRemoved.Add(position, true);
  19
  20             m_tile = tile;
  21             m_position = position;
  22             m_lifeTimer = 0.0f;
  23             m_flashTimer = 0.0f;
  24         }
  25
  26         public void Update(float deltaTime)
  27         {
  28             UpdateTimers(deltaTime);
  29         }
  30
  31         void UpdateTimers(float deltaTime)
  32         {
  33             m_lifeTimer += deltaTime;
  34             m_flashTimer += deltaTime;
  35         }
  36
  37         public static void RemoveReference(Vector3Int position)
  38         {
  39             s_tilesRemoved.Remove(position);
  40         }
  41
  42         public static bool IsInList(List<TileToRemove> list, Vector3Int position)
  43         {
  44             foreach (TileToRemove tile in list)
  45             {
  46                 if (tile.m_position == position)
  47                 {
  48                     return true;
  49                 }
  50             }
  51
  52             return false;
  53         }
  54     }
  55
  56     private Tilemap m_tilemap;
  57     private List<TileToRemove> m_tilesToRemove = new List<TileToRemove>();
  58
  59     public Color m_tileFlashColor = Color.red;
  60     public float m_tileLifeTime = 1.0f;
  61
  62     private float m_tileFlashInterval;
  63
  64     private void Awake()
  65     {
  66         m_tilemap = GetComponent<Tilemap>();
  67
  68         m_tileFlashInterval = m_tileLifeTime / 6.0f;
  69     }
  70
  71     void Update ()
  72     {
  73         foreach (TileToRemove tile in m_tilesToRemove.ToArray())
  74         {
  75             tile.Update(Time.deltaTime);
  76             Crumble(tile);
  77             Flash(tile);
  78         }
  79         }
  80
  81     void Crumble(TileToRemove tile)
  82     {
  83         if (tile.m_lifeTimer >= m_tileLifeTime)
  84         {
  85             m_tilemap.SetTile(tile.m_position, null);
  86             m_tilesToRemove.Remove(tile);
  87             TileToRemove.RemoveReference(tile.m_position);
  88         }
  89     }
  90
  91     void Flash(TileToRemove tile)
  92     {
  93         if (tile.m_flashTimer >= m_tileFlashInterval)
  94         {
  95             tile.m_flashTimer = 0.0f;
  96             Color currentColor = m_tilemap.GetColor(tile.m_position);
  97             m_tilemap.SetColor(tile.m_position, (currentColor == Color.white ? m_tileFlashColor : Color.white));
  98         }
  99     }
 100
 101     private void OnCollisionStay2D(Collision2D collision)
 102     {
 103         if (collision.gameObject.CompareTag("YarnPhysics"))
 104         {
 105             ContactPoint2D[] contact = new ContactPoint2D[1];
 106             GetComponent<CompositeCollider2D>().GetContacts(contact);
 107
 108             // Totally a hack; because it's very hard to get a world-to-grid-cell conversion,
 109             // the contact position is artificially incremented to find one viable location.
 110             // This also prevents the yarn from getting stuck.
 111             Vector2[] possibleContacts = new Vector2[9]
 112             {
 113                 contact[0].point,
 114                 contact[0].point + Vector2.up,
 115                 contact[0].point + Vector2.down,
 116                 contact[0].point + Vector2.left,
 117                 contact[0].point + Vector2.right,
 118                 contact[0].point + Vector2.up + Vector2.left,
 119                 contact[0].point + Vector2.up + Vector2.right,
 120                 contact[0].point + Vector2.down + Vector2.left,
 121                 contact[0].point + Vector2.down + Vector2.right,
 122             };
 123
 124             TileBase tile = null;
 125             Vector3Int tilePosition = Vector3Int.zero;
 126
 127             for (uint i = 0; i != possibleContacts.Length; ++i)
 128             {
 129                 tilePosition = m_tilemap.WorldToCell(possibleContacts[i]);
 130
 131                 if ((tile = m_tilemap.GetTile(tilePosition)) != null)
 132                 {
 133                     break;
 134                 }
 135             }
 136
 137             if (tile != null && !TileToRemove.IsInList(m_tilesToRemove, tilePosition))
 138             {
 139                 m_tilesToRemove.Add(new TileToRemove(tile, tilePosition));
 140             }
 141         }
 142     }
 143 }