BUG: Polygons Drawn with Pens of Odd Width (> 5) Misalign

MORE INFORMATION

Using the ShowGDI sample, the following steps reproduce the problem:

1. Start the ShowGDI sample and maximize it.
2. Set the pen width to 5.
3. Choose Polygon from the Draw menu and enter 4 for the number of points. Enter the following ordered pairs for the points 0 through 4: (20,20) (40,20) (40,40) (20,40).

Note that a 5-pixel frame correctly puts the extra pixel of pen width to the right and/or below the 20 and 40 coordinate lines (resulting in two pixels up and left, and three pixels down and right). This is correct (as are 1- and 3-pixel thick lines). However, odd widths of greater than or equal to 7 pixels start to round in the wrong direction:

1. Choose Clear from the View menu.
2. Choose Width from the Pen menu and enter 7 for the width.
3. Repeat step 3 above.

Now the extra pixels goes up and to the left, resulting in 4 up/left and 3 down/right.