Improve the polygon drawing: instead of painting them with a semi-dense pattern, use an alpha value for the brush color so it's really possible to see through them.

(In <a href="/issues/2006-12-10/files/tmp44tt3.png">http://img82.imageshack.us/my.php?image=tmp44tt3.png</a>; compare Kig/Qt3 (above) with Kig/Qt4 (below).)

Can not be in Kig/Qt3 due to Qt3 limitations.