Topic: Modify DWGUNITS

[FELIX]

How to modify the value in -DWGUNITS from 3 to 6 by AutoLISP?

Command: -DWGUNITS

Drawing units:
  1. Inches
  2. Feet
  3. Millimeters
  4. Centimeters
  5. Decimeters
  6. Meters
Unit for length <3>: 6

[BIGAL]

Something like this

Code: [Select]

(command "-dwgunits" 6 2 3 "N" "Y")

[ScottMC]

With my ancient A2K, this works: (setvar "LUNITS" 2) <- for decimal

[Lonnie]

With my ancient A2K, this works: (setvar "LUNITS" 2) <- for decimal

Untested but?

Code: [Select]

(defun check-and-set-lunits ()
  (if (/= (getvar "LUNITS") 6) ; Check if LUNITS is not already set to 6
      (progn
        (setq change_units (strcat "\nLUNITS is currently set to " (itoa (getvar "LUNITS")) ", do you want to change it to 6? [Y/N]: "))
        (if (equal (getstring change_units) "Y")
            (setvar "LUNITS" 6) ; Change LUNITS to 6
            (prompt "\nLUNITS remains unchanged.")))))
           
(check-and-set-lunits)

Change for meters

[huiz]

With my ancient A2K, this works: (setvar "LUNITS" 2) <- for decimal

DWGUNITS can have another setting, it is optional to match AutoCAD units settings.

[PKENEWELL]

With my ancient A2K, this works: (setvar "LUNITS" 2) <- for decimal

DWGUNITS can have another setting, it is optional to match AutoCAD units settings.

I would rather note that LUNITS is a sub-setting within the UNITS command, along with ANGDIR, AUNITS, ANGBASE, INSUNITS, LUPREC and AUPREC. Other system Variables that effect units are MEASUREINIT, MEASUREMENT and UNITMODE.

[huiz]

I did't say it isn't. DWGUNITS is something different. From origin it comes from a vertical, AutoCAD Architecture I think. Within DWGUNITS you can set some unit settings and it is optional to match them with the AutoCAD units.
Normally you don't notice the DWGUNITS stuff but there are cases you do.
The best setting is to match AutoCAD units and then forget all about DWGUNITS.

[FELIX]

With my ancient A2K, this works: (setvar "LUNITS" 2) <- for decimal

Untested but?

Code: [Select]

(defun check-and-set-lunits ()
  (if (/= (getvar "LUNITS") 6) ; Check if LUNITS is not already set to 6
      (progn
        (setq change_units (strcat "\nLUNITS is currently set to " (itoa (getvar "LUNITS")) ", do you want to change it to 6? [Y/N]: "))
        (if (equal (getstring change_units) "Y")
            (setvar "LUNITS" 6) ; Change LUNITS to 6
            (prompt "\nLUNITS remains unchanged.")))))
           
(check-and-set-lunits)

Change for meters

The command is -DWGUNITS and LUNITS does not accept =6

[FELIX]

Something like this

Code: [Select]

(command "-dwgunits" 6 2 3 "N" "Y")

How to do it without COMMAND to look elegant within a program?

[JasonB]

How to modify the value in -DWGUNITS from 3 to 6 by AutoLISP?

Command: -DWGUNITS

Drawing units:
  1. Inches
  2. Feet
  3. Millimeters
  4. Centimeters
  5. Decimeters
  6. Meters
Unit for length <3>: 6

This part of the command relates to INSUNITS
https://help.autodesk.com/view/ACDLT/2025/ENU/?guid=GUID-A58A87BB-482B-4042-A00A-EEF55A2B4FD8

Code - Auto/Visual Lisp: [Select]

1. (setvar 'INSUNITS 6)

PKENEWELL has listed this and the other system variables related to this command.

[FELIX]

The command is -DWGUNITS and not INSUNITS or LUNITS.

Please pay more attention before responding.

[JasonB]

The command is -DWGUNITS and not INSUNITS or LUNITS.

Please pay more attention before responding.

-DWGUNITS is a command.

INSUNITS and LUNITS are system variables

As others have pointed out, -DWGUNITS looks to be related to an AutoCAD Vertical. It's not documented anywhere that I could find in the HELP. Also, from other posts it seems geared more towards converting a drawing from one set of units to another. Further to this, the prompting of the command changes depending on whether you've run the command previously in a drawing. So simply calling

Code - Auto/Visual Lisp: [Select]

1. (command "._-DWGUNITS" 6 2 3 "_N" "_Y")

may not work in all cases.

If you're simply trying to set the drawing units, then it would be better to explore the -UNITS command.

How to do it without COMMAND to look elegant within a program?

All the settings of the -UNITS command can be set via a system variable, which allows you to avoid making a command call from lisp. This is a more elegant approach. e.g

Code - Auto/Visual Lisp: [Select]

1. (setvar 'INSUNITS 6)
2. (setvar 'LUNITS 2)
3. (setvar 'LUPREC 4)