An atlas is a grid of tiles laid out on a texture. Each tile in the grid must be exposed using [method create_tile]. Those tiles are then indexed using their coordinates in the grid.
Each tile can also have a size in the grid coordinates, making it more or less cells in the atlas.
Alternatives version of a tile can be created using [method create_alternative_tile], which are then indexed using an alternative ID. The main tile (the one in the grid), is accessed with an alternative ID equal to 0.
Each tile alternate has a set of properties that is defined by the source's [TileSet] layers. Those properties are stored in a TileData object that can be accessed and modified using [method get_tile_data].
As TileData properties are stored directly in the TileSetAtlasSource resource, their properties might also be set using [code]TileSetAtlasSource.set("<coords_x>:<coords_y>/<alternative_id>/<tile_data_property>")[/code].
Returns true if the tile at the [code]atlas_coords[/code] coordinates can be moved to the [code]new_atlas_coords[/code] coordinates with the [code]new_size[/code] size. This functions returns false if a tile is already present in the given area, or if this area is outside the atlas boundaries.
If [code]new_atlas_coords[/code] is [code]Vector2i(-1, -1)[/code], keeps the tile's coordinates. If [code]new_size[/code] is [code]Vector2i(-1, -1)[/code], keeps the tile's size.
Creates an alternative tile for the tile at coords [code]atlas_coords[/code]. If [code]alternative_id_override[/code] is -1, give it an automatically generated unique ID, or assigns it the given ID otherwise.
Returns the new alternative identifier, or -1 if the alternative could not be created with a provided [code]alternative_id_override[/code].
Returns the atlas grid size, which depends on how many tiles can fit in the texture. It thus depends on the Texture's size, the atlas [code]margins[/code] the tiles' [code]texture_region_size[/code].
If there is a tile covering the [code]atlas_coords[/code] coordinates, returns the top-left coordinates of the tile (thus its coordinate ID). Returns [code]Vector2i(-1, -1)[/code] otherwise.
Move the tile and its alternatives at the [code]atlas_coords[/code] coordinates to the [code]new_atlas_coords[/code] coordinates with the [code]new_size[/code] size. This functions will fail if a tile is already present in the given area.
If [code]new_atlas_coords[/code] is [code]Vector2i(-1, -1)[/code], keeps the tile's coordinates. If [code]new_size[/code] is [code]Vector2i(-1, -1)[/code], keeps the tile's size.
To avoid an error, first check if a move is possible using [method can_move_tile_in_atlas].
