CAD line type setting and programming

In computer-aided design (CAD), linetype is an important part of describing the style of lines in graphics. By properly setting the line type, the drawn graphics can be made clearer, easier to read, and convey specific information. This article will introduce in detail how to set line types in CAD software and provide corresponding source code examples.

1. Overview of CAD Linetypes
   In CAD, a linetype is a pattern composed of a series of line segments and intervals. These patterns can be solid lines, dotted lines, dotted lines, etc., and are used to represent different properties, such as object boundaries, construction details, dimensions, etc. By setting different line types, the drawings can be made clearer and easier to read, and can be customized as needed.

2. CAD line type setting
   CAD software usually provides the function of line type setting, which can be operated through programming or user interface. The following are sample codes for setting line types in some common CAD software.

2.1 AutoCAD
In AutoCAD, you can use the LTYPE command to set the line type. First, you need to define a new linetype table (Linetype Table), and then define specific linetype styles in the table. Here is a sample code:

(defun c:mylinetype ()
  (setq ltable (tblsearch "LTYPE" "MYLINE"))
  (if (not ltable)
    (progn
      (command "-linetype" "create" "MYLINE")
      (command "-linetype" "description" "MYLINE" "My Line Type")
      (command "-linetype" "pattern" "MYLINE" "DASHED" "0.5" "0.2" "-