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, ...

The default hatch pattern ANSI31 shown in the Boundary Hatch and Fill dialog

box looks like this:

3

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