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 These two programs help to find the first or the last point of an entity (for POLYLINE, LWPOLYLINE, SPLINE, LINE, ARC). Nikolai Poleshchuk ;CODING STARTS HERE ;********************************************************************** ;**** In the current coordinate system, find the first point of ;**** an entity of type LINE, POLYLINE, LWPOLYLINE, ARC, or SPLINE. ;**** V.Savelieva, 2000 ;********************************************************************** ;**** No globals. ;**** No arguments. ;**** The locals: ;**** w - the list returned by the entsel function; ;**** e - the specified entity; ;**** le - the list of the e entity; ;**** ten - the type of the e entity; ;**** ca10 - the value of the dotted pair (DXF code is 10); ;**** pt - the point to be found. ;**** The return value: ;**** a list of three coordinates of the points or nil ;**** (if an entity of another type was specified). ;********************************************************************** ; (defun ffp ( / w le e ten ca10 pt) ; Request for an object (setq w (entsel "\nSpecify an object of type LINE, ARC, POLYLINE, LWPOLYLINE, or SPLINE: " );entsel ) ; Check if an object is specified (while (null w) (setq w (entsel "\nNo object is selected, repeat: "))) ; Read the entity's data, get the values for the DXF codes 0 and 10 (setq le (entget (setq e (car w))) ten (cdr (assoc 0 le)) ca10 (cdr (assoc 10 le)) );setq ; Display the type of the entity (princ (strcat "\n" ten " ")) ; Find the first point of the object in its own coordinate system (setq pt (cond ; LINE and SPLINE ((or (= ten "LINE")(= ten "SPLINE")) ca10) ; LWPOLYLINE (append the third coordinate to ca10) ((= ten "LWPOLYLINE") (append ca10 (list (cdr (assoc 38 le))))) ; ARC (find the point by the center, the radius, and the angle ((= ten "ARC") (list (+ (car ca10) (* (cdr (assoc 40 le)) (cos (cdr (assoc 50 le)))) );+ (+ (cadr ca10) (* (cdr (assoc 40 le)) (sin (cdr (assoc 50 le)))) );+ (caddr ca10) );list ) ; POLYLINE (read the first vertex of the polyline) ((= ten "POLYLINE")(cdr (assoc 10 (entget (entnext e))))) ; For all other types display a message and return nil (T (princ "\nInvalid entity type. ") nil );T );cond );setq pt ; Transform the coordinates to the current UCS (if pt (trans pt e 1)) );defun ;CODING ENDS HERE ;CODING STARTS HERE ;********************************************************************** ;**** In the current coordinate system, find the last point of ;**** an entity of type LINE, POLYLINE, LWPOLYLINE, ARC, or SPLINE. ;**** V.Savelieva, 2000 ;********************************************************************** ;**** No globals. ;**** No arguments. ;**** The locals: ;**** w - the list returned by the entsel function; ;**** e - the specified entity; ;**** le - the list of the e entity; ;**** ten - the type of the e entity; ;**** ca10 - the value of the dotted pair (DXF code is 10); ;**** pt - the point to be found. ;**** The return value: ;**** a list of three coordinates of the points or nil ;**** (if an entity of another type was specified). ;********************************************************************** ; (defun flp ( / w e le ten ca10 e1 pt) ; Request (setq w (entsel "\nSpecify an object of type LINE, ARC, POLYLINE, LWPOLYLINE, or SPLINE: " );entsel );setq ; Check if an object is specifie (while (null w) (setq w (entsel "\nNo object is selected, repeat: "))) ; Read the entity's data (setq le (entget (setq e (car w))) ten (cdr (assoc 0 le)) ca10 (cdr (assoc 10 le)) ) ; Display the type of the entity (princ (strcat "\n" ten " ")) ; Find the last point of the object in its own coordinate system (setq pt (cond ; LINE ((= ten "LINE") (cdr (assoc 11 le))) ; SPLINE ((= ten "SPLINE") (cdr (assoc 10 (reverse le)))) ; LWPOLYLINE (append the third coordinate) ((= ten "LWPOLYLINE") (append (if (= 1 (cdr (assoc 70 le))); closed? ca10; last = first (cdr (assoc 10 (reverse le))) );if (list (cdr (assoc 38 le))) );append );LWPOLYLINE ; ARC (find the point by the center, the radius, and the angle ((= ten "ARC") (list (+ (car ca10) (* (cdr (assoc 40 le)) (cos (cdr (assoc 51 le)))) );+ (+ (cadr ca10) (* (cdr (assoc 40 le)) (sin (cdr (assoc 51 le)))) );+ (caddr ca10) );list );ARC ; POLYLINE (read the vertices of the polyline up to the SEQEND entity ((= ten "POLYLINE") (if (= 1 (cdr (assoc 70 le))); closed? (cdr (assoc 10 (entget (entnext e)))); last=first (progn (setq e1 (entnext e)) (while (= "VERTEX" (cdr (assoc 0 (entget (entnext e1))))) (setq e1 (entnext e1)) );while (cdr (assoc 10 (entget e1))) );progn );if );POLYLINE ; For all other types display a message and return nil (T (princ "\nInvalid entity type. ") nil );T );cond );setq ; Transform the coordinates to the current UCS (if pt (trans pt e 1)) );defun flp ;CODING ENDS HERE Copyright © 1999-Perpetuity by AfraLisp All rights reserved. Information in this document is subject to change without notice. Site created and maintained by Kenny Ramage 