Visual LISP, AutoLISP and General Customization

Visual LISP, AutoLISP and General Customization

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Using LISP to get the x,y coordinates of a pline

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02-01-2012 02:58 PM

 Is there anyway to use LISP to list the x,y coordinates of a pline?

                          Vonnie A.

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Re: Using LISP to get the x,y coordinates of a pline

02-01-2012 06:01 PM in reply to: vonniea
yes , get all the code 10 for a pline
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Post 3 of 4

Re: Using LISP to get the x,y coordinates of a pline

02-01-2012 08:49 PM in reply to: vonniea

vonniea wrote:

 Is there anyway to use LISP to list the x,y coordinates of a pline?

....


What format do you need them in?  For a Lightweight Polyline, this will give you a simple list of the X & Y coordinates of the vertices, undivided into individual points [supply appropriate information in place of the green parts]:

 

(vlax-get (vlax-ename->vla-object PlineEntityName) 'Coordinates)

 

Or [again for a Lightweight Polyline] this will give you a list of two-coordinate lists [the same as above, but divided into a separate pair for each vertex], removing the 10's from the vertex entity data entries:

 

(mapcar 'cdr (vl-remove-if-not '(lambda (x) (= (car x) 10)) PlineEntityData))

 

Might you sometimes be working with "heavy" Polylines [2D or 3D]?  Some adjustment would need to be made to get rid of the Z coordinates that the above functions would include for those.

 

Other adjustments would need to be made if you need them as comma-separated pairs, or written out to a file, or....

Kent Cooper
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Post 4 of 4

Re: Using LISP to get the x,y coordinates of a pline

02-01-2012 09:53 PM in reply to: vonniea

Test out the attached for LWPolylines, by loading file with APPLOAD and then typing PLVERTEX.  Application will list all x,y coordinates for vertices of polyline.

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