Neil Brown [Wed, 27 Aug 2008 20:30:50 +0000 (06:30 +1000)]
Fix detection of position of glyph on screen.
Using BBox.relpos to find position of glyph on screen didn't work
so well as it is too easy to miss the 'middle' which should be the
easiest to hit. So modify bbox so that above/below midline are easy
to detect.