/// <summary>
/// 在地图的指定位置由预制体创建Tile
/// 同时删除原有的Tile
/// </summary>
/// <param name="cellPos"></param>
/// <param name="prefab"></param>
public void CreateTileAt(Vector2Int cellPos, E_PrefabTile prefab)
{
DestroyTileImmediate(cellPos);
var tile = E_PrefabTile.Create(prefab).SetMap(this).SetCellPos(cellPos);
tileArray2D.SetByCoord(cellPos, tile);
}
/// <summary>
/// 通过外部空间的坐标设置指定位置的Tile
/// 当超出当前空间边界时，进行自动扩容
/// </summary>
/// <param name="coord"></param>
/// <param name="tile"></param>
public void SetByCoord(Vector2Int coord, E_PrefabTile tile)
{
if (IsOutOfCapacity(coord))
{
ExpandCapacity(coord);
}
var index = CoordToIndex(coord);
array[index.x + index.y * capacity.x] = tile;
}
/// <summary>
/// 每个维度单方向扩容至可以容纳outIndex索引
/// 并保持原有外部坐标不发生变化
/// </summary>
/// <param name="outCoord"></param>
private void ExpandCapacity(Vector2Int outCoord)
{
var outIndex = CoordToIndex(outCoord);
// 计算扩充后的数组长宽及外部原点
var newOriginIndex = originIndex;
var sumIncrement = new Vector2Int();
if (outIndex.x >= capacity.x)
{
sumIncrement.x = outIndex.x - capacity.x + 1 + increment.x;
}
else if (outIndex.x < 0)
{
sumIncrement.x = -outIndex.x + increment.x;
newOriginIndex.x += sumIncrement.x;
}
if (outIndex.y >= capacity.y)
{
sumIncrement.y = outIndex.y - capacity.y + 1 + increment.y;
}
else if (outIndex.y < 0)
{
sumIncrement.y = -outIndex.y + increment.y;
newOriginIndex.y += sumIncrement.y;
}
var newCapacity = capacity + sumIncrement;
var newArray = new E_PrefabTile[newCapacity.x * newCapacity.y];
// 转移原有的Tile
for (int x = 0; x < newCapacity.x; x++)
{
for (int y = 0; y < newCapacity.y; y++)
{
newArray[x + y * newCapacity.x] = GetByCoord(new Vector2Int(x, y) - newOriginIndex);
}
}
// 更新属性
array = newArray;
capacity = newCapacity;
originIndex = newOriginIndex;
}
/// <summary>
/// 创建
/// </summary>
/// <param name="prefab"></param>
/// <returns></returns>
public static E_PrefabTile Create(E_PrefabTile prefab)
{
if (prefab == null) return null;
return (E_PrefabTile) PrefabUtility.InstantiatePrefab(prefab);
}