How to draw complex patterns in cad?

1. Keyboard input pl space

2. Keyboard input a space. This will draw the curve.

Program 2:

arc space

Program 3:

To create a new rhombus pattern steel plate pattern library file as an example to illustrate the method:

First of all, make a rhombus pattern according to the national standard in CAD, and mark the size of each part.

Refer to the following library file standard format:

*pattern-name [, description]

angle, x-origin, y-origin, delta-x, delta-y [, dash-1, dash-2, ...]

The first line is the title line. Immediately following the asterisk is the name of the pattern, which is displayed when the HATCH command is executed to select the pattern. In square brackets is the optional description of the pattern when it is displayed by the HATCH command's "?" option of the HATCH command. If the description is omitted, there can be no comma after the pattern name.

The second line is a description line for the pattern. There can be one or more lines. Their meanings are: the angle at which the line is drawn, the X and Y coordinates of the point through which a line in the family of filler lines passes, the displacement between two filler lines, the vertical spacing between two filler lines, dash-n is a parameter for the length of a straight line, which can take a positive, negative, or zero value; a positive value indicates that the length segment is a solid line; a negative value indicates that the segment is left blank; a zero value draws a point. 25, 30.0213, -6.59

68.4667, -11.0191, 27.926, -9.8646, 25, 30.0213, -6.59

111.5333, 11.0191, 27.926, 9.8646, 25, 30.0213, -6.59

< p>Note:

Pattern definition files can contain up to 80 characters per line.

AutoCAD ignores blank lines and text to the right of semicolons. Based on this line, you can add copyright information, notes, or whatever you want to include in the file. For example: ;Copyright (c) 2000 by everyone. all rights reserved.

Finally, save the file with the name custom.Pat. Note that the file name must be the same as the pattern name.

Mastered the custom pattern. Now, with a little patience, you can edit very complex patterns.