Version: 2017.3
public void BoxFill (Vector3Int position, Tilemaps.TileBase tile, int startX, int startY, int endX, int endY);

Parameters

position Position of the Tile on the Tilemap.
tile Tile to place.
startX The minimum X coordinate limit to fill to.
startY The minimum Y coordinate limit to fill to.
endX The maximum X coordinate limit to fill to.
endY The maximum Y coordinate limit to fill to.

Description

Does a box fill with the given tile on the tile map. Starts from given coordinates and fills the limits from start to end (inclusive).

If the limits are larger than the tilemap bounds, the limits will be capped to the tilemap bounds.