adopted some of the phrasing

Author: Ashtreighlia

adafruit_display_shapes/rect.py

@@ -60,7 +60,7 @@ def __init__(
         stroke: int = 1,
     ) -> None:
         if width <= 0 or height <= 0:
-            raise ValueError("Width and height must be greater than 0")
+            raise ValueError("Rectangle dimensions must be larger than 0.")
 
         self._bitmap = displayio.Bitmap(width, height, 2)
         self._palette = displayio.Palette(2)

adafruit_display_shapes/roundrect.py

@@ -52,10 +52,10 @@ def __init__(
         outline: Optional[int] = None,
         stroke: int = 1,
     ) -> None:
-        if r > width / 2 or r > height / 2:
-            raise ValueError("Radius too large for given dimensions")
         if width <= 0 or height <= 0:
-            raise ValueError("Width and height must be greater than 0")
+            raise ValueError("Rectangle dimensions must be larger than 0.")
+        if r > width / 2 or r > height / 2:
+            raise ValueError("Radius cannot exceed half of the smaller side (width or height).")
 
         self._palette = displayio.Palette(3)
         self._palette.make_transparent(0)