Use pen widths when drawing ImageDraw2 shape outlines

Tests/test_imagedraw2.py

@@ -103,7 +103,7 @@ def test_ellipse(bbox: Coords) -> None:
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw2.Draw(im)
-    pen = ImageDraw2.Pen("blue", width=2)
+    pen = ImageDraw2.Pen("blue")
     brush = ImageDraw2.Brush("green")
 
     # Act
@@ -177,7 +177,7 @@ def test_polygon(points: Coords) -> None:
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw2.Draw(im)
-    pen = ImageDraw2.Pen("blue", width=2)
+    pen = ImageDraw2.Pen("blue")
     brush = ImageDraw2.Brush("red")
 
     # Act
@@ -192,7 +192,7 @@ def test_rectangle(bbox: Coords) -> None:
     # Arrange
     im = Image.new("RGB", (W, H))
     draw = ImageDraw2.Draw(im)
-    pen = ImageDraw2.Pen("green", width=2)
+    pen = ImageDraw2.Pen("green")
     brush = ImageDraw2.Brush("black")
 
     # Act
@@ -202,6 +202,16 @@ def test_rectangle(bbox: Coords) -> None:
     assert_image_equal_tofile(im, "Tests/images/imagedraw_rectangle.png")
 
 
+@pytest.mark.parametrize("bbox", BBOX)
+def test_rectangle_pen_width(bbox: Coords) -> None:
+    im = Image.new("RGB", (W, H))
+    draw = ImageDraw2.Draw(im)
+    pen = ImageDraw2.Pen("white", width=4)
+    draw.rectangle(bbox, pen)
+    assert im.getpixel((28, 28)) == WHITE
+    assert im.getpixel((50, 50)) == BLACK
+
+
 def test_big_rectangle() -> None:
     # Test drawing a rectangle bigger than the image
     # Arrange

src/PIL/ImageDraw2.py

@@ -35,7 +35,11 @@
 
 
 class Pen:
-    """Stores an outline color and width."""
+    """Stores an outline color and width.
+
+    :param color: The outline color.
+    :param width: The line width, in pixels.
+    """
 
     def __init__(self, color: str, width: int = 1, opacity: int = 255) -> None:
         self.color = ImageColor.getrgb(color)
@@ -115,8 +119,7 @@ def render(
         else:
             kwargs.setdefault("fill", fill)
             kwargs.setdefault("outline", outline)
-        if op == "line":
-            kwargs.setdefault("width", width)
+        kwargs.setdefault("width", width)
         getattr(self.draw, op)(xy, **kwargs)
 
     def settransform(self, offset: tuple[float, float]) -> None: