AfraLISP - Learn AutoLISP for AutoCAD productivity

AutoLISP Tips'n'Tricks

Below are listed the most recent AutoLISP tips'n'tricks.

Listing Symbols

The following will give you a list of all entries in a symbol table. This is great for creating a list to populate a list box in DCL.

;;;Start Coding Here
(defun tablelist (s / d r)
		(setq d (tblnext s (null d)))
		(setq r (cons (cdr (assoc 2 d)) r))
;;;End Coding Here

For example, if you would like a list of all layers in a specific drawing, use this :

(setq all_layers (tablelist "LAYER"))

AutoLisp should return something like this :

("7" "6" "5" "4" "3" "2" "0")

To populate a list box with the key of "selections," use this :

(start_list "selections")
(mapcar 'add_list all_layers)

Drawing Path

To get the full path, you append the DWGPREFIX system variable (which stores the path) to the DWGNAME system variable (which stores the file name). Use code such as the following example to retrieve and assign the values of DWGNAME and DWGPREFIX to variables in AutoLISP :

(setq DN (getvar "DWGNAME"))
(setq DP (getvar "DWGPREFIX"))

Use the AutoLISP function (strcat) to concatenate the results and assign them to a variable, for example :

(setq TM (strcat DP DN))

In this example, the variable TM contains the full path including the file name.

AutoLisp Comments

Did you know that you can write block comments in your AutoLisp files like this :

;| This is the start of the comments.
   You can carry your comments to multiple lines.
   This will end your comments |;

That little line is the pipe character or vertical bar.

Entity Length

This will display the length of most entities :

;Coding starts here
(defun c:lg ( / x_object x_length)
(setq x_object (entsel))
(setq x_object (vlax-Ename->Vla-Object (car x_object)))
(setq x_length (vlax-curve-getdistatparam x_object 
               (vlax-curve-getendparam x_object )))
(alert (strcat "Length = " (rtos x_length)))
;Coding ends here

Restoring a Circle

This routine will join 2 arcs back into a circle. It will also complete a circle from an Arc.

(defun c:rcirc (/ os pt2 a pt1 ra pt3)
	(setq os (getvar "osmode"))
	(setvar "osmode" 512)
	(setq pt2 (getpoint "\nPick one of the Arcs : "))
	(setq a (entget (ssname (ssget pt2) 0)))
	(setq pt1 (cdr (assoc 10 a)))
	(setq ra (cdr (assoc 40 a)))
	(command "erase" pt2 "")
	(setq pt3 (getpoint "\nPick other Arc : "))
	(setvar "osmode" os)
	(command "erase" pt3 "")
	(command "circle" pt1 ra)

Begin this routine with one or two arcs. Pick either arc. That arc will disappear. Pick the remaining arc if you started with two. If you started with only one arc, pick any blank space on the screen or press Enter. Now the circle will be restored or the single arc is turned into a complete circle.