The average character width of a font is the average character increment in world coordinates. The character increment is the sum of the a-space, b-space, and c-space of a character. If you are setting the font-use indicator FATTR_FONTUSE_OUTLINE, you can set the average character width to 0 because the outline fonts take an equivalent value from the character cell attribute that is current when text is written to an output device.

This field should be specified when requesting an image font using GpiCreateLogFont. It must be specified in world coordinates.