CAD tip # 10884:

Question CAD
% platform category

Simple detection of a 2D/3D DWG or an empty DWG.

If you to find in your utility or menu-macro whether the current drawing is a 2D or 3D drawing file, or whether it doesn't contain any visual entities, you can use the following simple AutoLISP functions (predicates):

;is current drawing 2D?  
(defun is2D-p ()  
 (and (zerop (caddr (getvar "EXTMIN")))(zerop (caddr (getvar "EXTMAX")))) ; Z-boundingbox = 0?  
)  
;is current drawing 3D?  
(defun is3D-p ()  
 (< (caddr (getvar "EXTMIN"))(caddr (getvar "EXTMAX"))) ; Z-boundingbox ?  
)  
  
;is current drawing visually empty?  
(vl-load-com)  
(defun isEmpty-p ()  
 (vla-regen (vla-get-activedocument (vlax-get-acad-object)) 1)  
 (> (caddr (getvar "EXTMIN"))(caddr (getvar "EXTMAX"))) ; min>max?  
)

The functions - e.g. (is2D-p) - return the values of T (true) or nil (false) in AutoCAD.

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4.5.2016 7337×

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applies to: AutoCAD ·

See also:
Tip 14063:	How to get week day and week number from a given date.
Tip 14027:	3D heart from the heart.
Tip 14006:	Universal MsgBox in AutoLISP.
Tip 13960:	Fermat's spiral in AutoCAD.
Tip 13847:	Pringles in AutoCAD - a hyperbolic paraboloid.

Selected tip: ActiveX component not installed when entering iProject.

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