User Guide

Making OpenType Fonts
675
Single Positioning
A Single Pos rule is specified as:
position <glyph|glyphclass> <valuerecord>;
Here, the <glyph|glyphclass> is adjusted by the <valuerecord> [§2.e.iv].
For example, to reduce the left and right sidebearings of a glyph each by 80
design units:
position one <-80 0 -160 0>;
To shift the glyph up by 100 units:
position A <0 100 0 –100>;
Note that we changed the placement by 100 units but compensated for that
with a –100 change applied to advance. This is needed to shift only the
current glyph and not the following glyphs in the string.