The next component is the origin of the line group 0 O.In this case it is 0 for a horitontalline that runs from left to right. This value indicates the angle of the line group as determined by the line’s orientation. The first component is the 0 at the beginning.It actually contains four sets of information separated by blank spaces: This example shows a series of numbers separated by Commas it represents one line group. Each of these lines is duplicated in a fashion that makes the lines appear as boxes when they are combined. In the square pattern for instance two linesone horizontal and one vertical-are used. A line group is a line of code much as a line type is defined. A line group is like a line type that is arrayed a specified distance to fill the area to be hatched. Figure 20.10 shows the hatch pattern defined in the example.Ī pattern is made up of line groups. The first line determines the horizontal line component of the pattern and the second line represents the vertical component. Each line represents a line in the pattern. This example shows two lines of information. However the numbers in pattern descriptions have a different meaning. You can see some similarities between pattern descriptions and line-type descriptions. They both start with a line of descriptive text and then give numeric values defining the pattern. Here is one hatch pattern definition from that file: This file can be opened and edited with a text editor that can handle ASCn files such as the Windows Notepad. The pattern definitions are contained in an external file named Acad. Unlike line types hatch patterns can not be created while you are in an AutoCAD file. This section demonstrates the basic elements of pattern definition. AutoCAD provides several predefined hatch patterns you can choose from (see Figure 20.9) but you can also create your own.

Create autocad hatch patterns