Add support for transformations in Tilesets. Closes #37

pytiled_parser/tileset.py

@@ -46,6 +46,27 @@ class Frame(NamedTuple):
     duration: int
 
 
+@attr.s(auto_attribs=True, kw_only=True)
+class Transformations:
+    """Transformations Object.
+
+    This is used to store what transformations may be performed on Tiles
+    within a tileset. (This is primarily used with wang sets, however could
+    be used for any means a game wants really.)
+
+    Args:
+        hflip: Allow horizontal flip?
+        vflip: Allow vertical flip?
+        rotate: Allow rotation?
+        prefer_untransformed: Should untransformed tiles be preferred?
+    """
+
+    hflip: Optional[bool] = None
+    vflip: Optional[bool] = None
+    rotate: Optional[bool] = None
+    prefer_untransformed: Optional[bool] = None
+
+
 @attr.s(auto_attribs=True, kw_only=True)
 class Tile:
     # FIXME: args
@@ -121,6 +142,8 @@ class Tileset:
     image_width: Optional[int] = None
     image_height: Optional[int] = None
 
+    transformations: Optional[Transformations] = None
+
     firstgid: Optional[int] = None
     background_color: Optional[Color] = None
     tile_offset: Optional[OrderedPair] = None
@@ -145,6 +168,15 @@ class RawTileOffset(TypedDict):
     y: int
 
 
+class RawTransformations(TypedDict):
+    """ The keys and their types that appear in a Transformations JSON Object."""
+
+    hflip: bool
+    vflip: bool
+    rotate: bool
+    preferuntransformed: bool
+
+
 class RawTile(TypedDict):
     """ The keys and their types that appear in a Tile JSON Object."""
 
@@ -189,7 +221,7 @@ class RawTileSet(TypedDict):
     tiles: List[RawTile]
     tilewidth: int
     transparentcolor: str
-    type: str
+    transformations: RawTransformations
     version: Union[str, float]
     wangsets: List[RawWangSet]
 
@@ -262,6 +294,24 @@ def _cast_tile(raw_tile: RawTile, external_path: Optional[Path] = None) -> Tile:
     return tile
 
 
+def _cast_transformations(raw_transformations: RawTransformations) -> Transformations:
+    """Cast the raw_transformations to a Transformations object.
+
+    Args:
+        raw_transformations: RawTransformations to be casted to a Transformations
+
+    Returns:
+        Transformations: The Transformations created from the raw_transformations
+    """
+
+    return Transformations(
+        hflip=raw_transformations["hflip"],
+        vflip=raw_transformations["vflip"],
+        rotate=raw_transformations["rotate"],
+        prefer_untransformed=raw_transformations["preferuntransformed"],
+    )
+
+
 def _cast_grid(raw_grid: RawGrid) -> Grid:
     """Cast the raw_grid to a Grid object.
 
@@ -356,4 +406,7 @@ def cast(raw_tileset: RawTileSet, external_path: Optional[Path] = None) -> Tiles
             wangsets.append(cast_wangset(raw_wangset))
         tileset.wang_sets = wangsets
 
+    if raw_tileset.get("transformations") is not None:
+        tileset.transformations = _cast_transformations(raw_tileset["transformations"])
+
     return tileset

tests/test_data/tilesets/image_transformations/expected.py

@@ -0,0 +1,25 @@
+from pathlib import Path
+
+from pytiled_parser import tileset
+
+EXPECTED = tileset.Tileset(
+    columns=8,
+    image=Path("../../images/tmw_desert_spacing.png"),
+    image_height=199,
+    image_width=265,
+    margin=1,
+    spacing=1,
+    name="tile_set_image",
+    tile_count=48,
+    tiled_version="1.6.0",
+    tile_height=32,
+    tile_width=32,
+    transformations=tileset.Transformations(
+        hflip=True,
+        vflip=False,
+        prefer_untransformed=False,
+        rotate=False,
+    ),
+    version="1.6",
+    type="tileset",
+)

tests/test_data/tilesets/image_transformations/tileset.json

@@ -0,0 +1,21 @@
+{ "columns":8,
+ "image":"..\/..\/images\/tmw_desert_spacing.png",
+ "imageheight":199,
+ "imagewidth":265,
+ "margin":1,
+ "name":"tile_set_image",
+ "spacing":1,
+ "tilecount":48,
+ "tiledversion":"1.6.0",
+ "tileheight":32,
+ "tilewidth":32,
+ "transformations":
+    {
+     "hflip":true,
+     "preferuntransformed":false,
+     "rotate":false,
+     "vflip":false
+    },
+ "type":"tileset",
+ "version":"1.6"
+}

tests/test_tileset.py

@@ -20,6 +20,7 @@ ALL_TILESET_DIRS = [
     TILE_SETS / "image_properties",
     TILE_SETS / "image_transparent_color",
     TILE_SETS / "image_tile_offset",
+    TILE_SETS / "image_transformations",
     TILE_SETS / "individual_images",
     TILE_SETS / "terrain",
 ]