private TileMapChunk GetOrCreateTileMapChunk(int world_grid_x, int world_grid_y, bool is_create_if_doesnt_exist = false)
{
if (tileMapChunk_cache_dict.Count == 0 && transform.childCount > 0)
{
BuildTileMapChunkCacheDict();
}
Vector2Int chunk_xy = TileMapChunkUtil.GetChunkXY(world_grid_x, world_grid_y);
TileMapChunk tileMapChunk = null;
uint key = GetTileMapChunkKey(chunk_xy);
tileMapChunk_cache_dict.TryGetValue(key, out tileMapChunk);
if (tileMapChunk == null && is_create_if_doesnt_exist)
{
string chunk_name = string.Format("{0}_{1}", chunk_xy.x, chunk_xy.y);
GameObject chunk_gameObject = new GameObject(chunk_name);
if (is_undo_enabled)
{
#if UNITY_EDITOR
Undo.RegisterCreatedObjectUndo(chunk_gameObject, TileMapConst.Undo_Operation_Name + name);
#endif
}
tileMapChunk = chunk_gameObject.AddComponent <TileMapChunk>();
chunk_gameObject.transform.parent = transform;
Vector2Int offset_grid_xy = TileMapChunkUtil.GetOffsetGridXY(chunk_xy);
tileMapChunk.offset_grid_x = offset_grid_xy.x;
tileMapChunk.offset_grid_y = offset_grid_xy.y;
chunk_gameObject.transform.localPosition = new Vector2(tileMapChunk.offset_grid_x * cell_size.x, tileMapChunk.offset_grid_y * cell_size.y);
chunk_gameObject.transform.localRotation = Quaternion.identity;
chunk_gameObject.transform.localScale = Vector3.one;
chunk_gameObject.hideFlags = gameObject.hideFlags | HideFlags.HideInHierarchy;
if (Application.isPlaying)
{
tileMapChunk.Reset();
}
tileMapChunk.parent_tileMap = this;
tileMapChunk.SetDimensions(TileMapConst.TileMapChunk_Size, TileMapConst.TileMapChunk_Size);
tileMapChunk.SetSharedMaterial(material);
tileMapChunk.SortingLayerID = sortingLayer;
tileMapChunk.OrderInLayer = orderInLayer;
tileMapChunk.UpdateRendererProperties();
tileMapChunk_cache_dict[key] = tileMapChunk;
}
return(tileMapChunk);
}
//在chunk数组中的[][]坐标中x，chunck数组与grid格子数组类似，(只不过是grid_x/TileMapConst.TileMapChunk_Size,所以里面的元素个数相对于grid格子数组里面的个数少)
public Vector2Int GetChunkXY()
{
return(TileMapChunkUtil.GetChunkXY(offset_grid_x, offset_grid_y));
}