fill(index, x, y, width, height, layer)
Fills the given area with the specified tile.
Parameters
Name Type Argument Description index number The index of the tile that the area will be filled with. x number X position of the top left of the area to operate one, given in tiles, not pixels. y number Y position of the top left of the area to operate one, given in tiles, not pixels. width number The width in tiles of the area to operate on. height number The height in tiles o