A room's tile layers, each drawn as one picture.
Cauldron2D.GameMaker.Draw.run/1 gives a visible layer's tiles as one draw list item
(item/4) whose picture is {:tile_layer, room, layer, blend}: the room's index, the
layer's name, and the colour Cauldron2D.GameMaker.World.put_layer/3's :tile_blend
gave an asset layer's tiles, or nil. It stands at the layer's offset plus the top-left
corner of its tiles. raster/3 draws that picture from the game's data: every tile as
the layer would draw it on its own, mirrored, flipped and turned as its cell says, in
its colour and alpha. A key always names the same pixels, so a picture drawn once can
be kept and drawn again.
raster = Cauldron2D.GameMaker.TileLayers.raster(data, key, &MyGame.picture/1)Summary
Functions
The draw list item for the tiles of layer, a layer of room room already moved to
where it is drawn, its asset tiles blended blend (or nil); nil when it has no
tiles.
The picture key names, drawn with pictures (a function from a tile's picture key,
{:tile, background, tile} or {:sprite_part, sprite, rectangle}, to its raster);
nil when the room has no such layer or the layer no tiles.
Types
@type key() :: {:tile_layer, non_neg_integer(), String.t(), {byte(), byte(), byte()} | nil}
Functions
@spec item( Cauldron2D.GameMaker.Data.t(), non_neg_integer(), Cauldron2D.GameMaker.Room.Layer.t(), {byte(), byte(), byte()} | nil ) :: map() | nil
The draw list item for the tiles of layer, a layer of room room already moved to
where it is drawn, its asset tiles blended blend (or nil); nil when it has no
tiles.
@spec raster(Cauldron2D.GameMaker.Data.t(), key(), (term() -> FrenchCurve.Raster.t() | nil)) :: FrenchCurve.Raster.t() | nil
The picture key names, drawn with pictures (a function from a tile's picture key,
{:tile, background, tile} or {:sprite_part, sprite, rectangle}, to its raster);
nil when the room has no such layer or the layer no tiles.