2011

Quick Reference
Commands
LOAD
Makes shapes available for use by the SHAPE command.
SHAPE
Inserts a shape from a shape file that has been loaded using LOAD.
Big Font Descriptions
Some languages, such as Japanese, use text fonts with thousands of non-ASCII
characters. In order for drawings to contain such text, AutoCAD for Mac
supports a special form of shape definition file called a Big Font file.
Define a Big Font
Special codes in the first line of a Big Font file specify how to read two-byte
hexidecimal codes.
A font with hundreds or thousands of characters must be handled differently
from a font containing the ASCII set of up to 256 characters. In addition to
using more complicated techniques for searching the file, AutoCAD for Mac
needs a way to represent characters with two-byte codes as well as one-byte
codes. Both situations are addressed by the use of special codes at the beginning
of a Big Font file.
The first line of a Big Font shape definition file must be as follows:
*BIGFONT nchars,nranges,b1,e1,b2,e2,...
where nchars is the approximate number of character definitions in this set;
if it is off by more than about 10 percent, either speed or file size suffers. You
can use the rest of the line to name special character codes (escape codes) that
signify the start of a two-byte code. For example, on Japanese computers, Kanji
characters start with hexadecimal codes in the range 90-AF or E0-FF. When
the operating system sees one of these codes, it reads the next byte and
combines the two bytes into a code for one Kanji character. In the *BIGFONT
line, nranges tells how many contiguous ranges of numbers are used as escape
codes; b1, e1, b2, e2, and so on, define the beginning and ending codes in
170 | Chapter 8 Shapes and Shape Fonts