(sprito.py) Added functions rect, fill_screen, invert_pixel, invert_rect.

sprito.py

@@ -1,4 +1,4 @@
-from casioplot import set_pixel
+from casioplot import set_pixel, get_pixel
 
 class SpriteIndexed:
   def __init__(self, w: int, h: int, data):
@@ -35,3 +35,20 @@ class SpriteRaw(SpriteIndexed):
       SpriteIndexed.draw(self, x, y, None)
     def to_raw(self) -> None:
       return None
+
+def rect(x: int, y: int, w: int, h: int, color: tuple) -> None:
+  for i in range(x, x + w):
+    for j in range(y, y + h):
+      set_pixel(i, j, color)
+
+def fill_screen(color: tuple) -> None:
+  rect(0, 0, 384, 192, color)
+
+def invert_pixel(x: int, y: int) -> None:
+  ocolor = get_pixel(x, y)
+  set_pixel(x, y, (255 - ocolor[0], 255 - ocolor[1], 255 - ocolor[2]))
+
+def invert_rect(x: int, y: int, w: int, h: int) -> None:
+  for i in range(x, x + w):
+    for j in range(y, y + h):
+      invert_pixel(i, j)