Fix bitmap sprite placement now that larger Ys are at the to of the screen.

Author: tmontes

src/aturtle/canvas.py

@@ -38,6 +38,11 @@ def create_polygon(self, coords, *, fill, outline, width):
         )
 
 
+    def create_image(self, x, y, *, image, anchor):
+
+        return super().create_image(x, -y, image=image, anchor=anchor)
+
+
     def move(self, item_id, dx, dy):
 
         return super().move(item_id, dx, -dy)

src/aturtle/sprites/bitmap.py

@@ -27,7 +27,7 @@ def __init__(self, canvas, shape, *, anchor=(0, 0), angle=0, speed=360,
             sprite_x - shape_x,
             sprite_y - shape_y,
             image=shape[angle],
-            anchor='nw',
+            anchor='sw',
         )
 
 

tests/test_bitmap_sprites.py

@@ -56,7 +56,7 @@ def test_create_calls_canvas_create_image(self):
             -10,
             -10,
             image='image-at-angle-0',
-            anchor='nw',
+            anchor='sw',
         )