2011

needs to recognize four new keys: two for superscripts and two for subscripts.
To avoid altering the existing font definitions, you can access these with the
numeric keypad on your keyboard.
To add superscript and subscript definitions to a font
This example procedure is based on the AutoCAD for Mac Romans font file,
although a similar method applies to any AutoCAD for Mac font. This
procedure adds four new shape definitions to a font: super_on, super_off,
sub_on, and sub_off, which control the position and size of the characters
that follow. For simplicity, this example replaces the left- and right-bracket
characters ([and]) and the left and right curly brace characters ({and}) with
the new characters. You may choose to replace other characters or use a shape
number in the extended range (ASCII codes 128 through 256). If you use an
extended shape number, you need to use the %%nnn method (where nnn is
the ASCII value of the character) for placing the new characters.
1 Edit your SHP file with an ASCII text editor.
2 Search for the shape definitions of the characters you are replacing. To
comment out those definitions so the new definitions can take their
place, insert a semicolon in front of each line of the shape definition.
The shape definition may continue for a number of lines.
The left- and right-bracket characters have ASCII values of 91 and 93 (05B
and 05D hex values, if the font is Unicode). The left and right curly brace
characters have ASCII values of 123 and 125 (07B and 07D hex).
3 Add the first and second values on the second line of the definition, and
divide the total by 2 as shown in the following example:
*UNIFONT,6,Extended Simplex Roman for UNICODE
21,7,2,0 21 + 7 = 28, then 28 / 2 = 14. This number is used
later.
4 Add the following lines to the end of the SHP file:
*91,8,super_on
2,8,(0,14),003,2,1,0
*93,8,super_off
2,004,2,8,(0,-14),1,0
*123,8,sub_on
2,8,(0,-14),003,2,1,0
*125,8,sub_off
2,004,2,8,(0,14),1,0
Notice the 14 and -14 values in the preceding lines. They are Y axis offsets
for the imaginary pen. The value 14 is half the maximum height of a
182 | Chapter 8 Shapes and Shape Fonts