- /* our outlines are always inside our coordinates, but we have
- * to ensure that our bounding box fully *contains* the
- * rectangle
- *
- * XXX: or something like that, waffle.
- *
- */
- _bounding_box = _rect.fix ();
+ /* if the outline is 1 pixel, then the actual
+ bounding box is 0.5 pixels outside the stated
+ corners of the rectangle.
+
+ if the outline is 2 pixels, then the actual
+ bounding box is 1.0 pixels outside the stated
+ corners of the rectangle (so that the middle
+ of the 2 pixel wide border passes through
+ the corners, alternatively described as 1 row
+ of pixels outside of the corners, and 1 row
+ inside).
+
+ if the outline is 3 pixels, then the actual
+ bounding box is 1.5 outside the stated corners
+ of the rectangle (so that the middle row of
+ pixels of the border passes through the corners).
+
+ if the outline is 4 pixels, then the actual bounding
+ box is 2.0 pixels outside the stated corners
+ of the rectangle, so that the border consists
+ of 2 pixels outside the corners and 2 pixels inside.
+
+ hence ... the bounding box is width * 0.5 larger
+ than the rectangle itself.
+ */
+
+ _bounding_box = r.expand (1.0 + _outline_width * 0.5);