Customization Guide (.pdf) - Documentation & Online Help - Autodesk

Custom Hatch Patterns
AutoCAD LT ® provides a library of standard hatch patterns in the acadlt.pat and acadltiso.pat
files. You can use the hatch patterns as they are, modify them, or create your own custom
hatch patterns.
Overview of Hatch Pattern Definitions
In addition to using the predefined hatch patterns that are supplied, you can
design and create your own custom hatch patterns.
In addition to using the predefined hatch patterns that are supplied, you can
design and create your own custom hatch patterns. Developing a hatch pattern
definition requires knowledge, practice, and patience. Because customizing
hatches requires familiarity with hatch patterns, it is not recommended for new
users.
The hatch patterns supplied by AutoCAD LT are stored in the acadlt.pat and
acadltiso.pat text files. You can add hatch pattern definitions to this file or create
your own files.
Regardless of where the definition is stored, a custom hatch pattern has the
same format. It has a header line with a name, which begins with an asterisk
and is no more than 31 characters long, and an optional description:
*pattern-name, description
It also has one or more line descriptors of the following form:
angle, x-origin,y-origin, delta-x,delta-y,dash-1,dash-2, …
3
The default hatch pattern ANSI31 shown in the Boundary Hatch and Fill dialog
box looks like this:
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