unknown function autolisp

[mohammadreza]

hi everybody .
why some function lisp is like unknown function in my autocad
im talking about (ssget "_W" ...   )
actualy in autocad just accept (ssget "X"
and (ssget   )

?!

[mhupp]

some ssget  like "_W" need other infromation to work. in this case it needs two points Lower left and upper right of a rectangle.

 

(ssget "_W" '(3 2) '(5 4))

 

This will select anything that is 100% inside the rectangle that goes from (3,2) to (5,4)

 

More here or here

 

--Edit

(ssget "_X") - is selecting everything in the drawing and doesn't need points.

(ssget) - is waiting for you to make a selection by default

 

Edited October 19, 2023 by mhupp

[BIGAL]

Another for a non recatngular shape.

(ssget "CP" (list pt1 pt2 pt3 pt4 pt1))