2013

Custom Hatch Patterns
AutoCAD
®
provides a library of standard hatch patterns in the acad.pat and acadiso.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.
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 are stored in the acad.pat and
acadiso.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, …
The default hatch pattern ANSI31 shown in the Boundary Hatch and Fill dialog
box looks like this:
and is defined as follows:
3
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