Totaliser longueur et surface par calque

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;;; ============================================================================
;;; CXSUM - Total length and area by layer
;;; Version 1.0.0
;;; CADXChange LISP tools - https://cadxchange.net/resources/lisp/cxsum
;;; Tested in: AutoCAD (full version). Other programs that run AutoLISP may work but are not tested.
;;; Copyright (c) CADXChange. Free for personal and commercial use; do not resell or
;;; republish it as a collection. Terms: https://cadxchange.net/legal/lisp-terms
;;; ============================================================================

;; Total the lengths and areas of the objects in NAMES, layer by layer.
;; Lines, arcs, polylines, circles and ellipses have a length (a circle: its circumference); closed polylines,
;; circles and full ellipses also have an area. Returns ((layer count length area) ...) sorted by layer name.
(defun cx:sum-run (names / table ed layer len area row)
  (foreach e names
    (setq ed    (entget e)
          layer (cx:dxf 8 ed)
          len   (cx:ent-length ed)
          area  (cx:ent-area ed))
    (if len
      (progn
        (setq row (assoc layer table))
        (if row
          (setq table (subst (list layer (1+ (nth 1 row)) (+ (nth 2 row) len) (+ (nth 3 row) (if area area 0.0))) row table))
          (setq table (cons (list layer 1 len (if area area 0.0)) table))))))
  (cx:sort table (function (lambda (a b) (< (strcase (car a)) (strcase (car b)))))))

(defun c:CXSUM ( / *error* cx:sv ss rows prec pt tc tl ta lines)
  (setq *error* cx:err)
  (if (setq ss (cx:pick "\nSelect lines, arcs, polylines, circles or ellipses: " '((0 . "LINE,ARC,LWPOLYLINE,CIRCLE,ELLIPSE"))))
    (progn
      (setq rows (cx:sum-run (cx:ss->list ss))
            prec (getvar "LUPREC")
            tc 0 tl 0.0 ta 0.0)
      (princ "\nLayer / count / length / area")
      (foreach r rows
        (princ (strcat "\n" (car r) "   " (itoa (nth 1 r)) "   " (cx:num (nth 2 r) prec) "   " (cx:num (nth 3 r) prec)))
        (setq tc (+ tc (nth 1 r)) tl (+ tl (nth 2 r)) ta (+ ta (nth 3 r))))
      (princ (strcat "\nTotal   " (itoa tc) "   " (cx:num tl prec) "   " (cx:num ta prec)))
      (if (and rows (= (cx:ask-kw "Place the table in the drawing" "Yes No" "No") "Yes")
               (setq pt (getpoint "\nTop-left corner of the table: ")))
        (progn
          (cx:start '(("CMDECHO" . 0)))
          (setq lines (mapcar (function (lambda (r) (strcat (car r) " : " (itoa (nth 1 r)) " pcs, length " (cx:num (nth 2 r) prec) ", area " (cx:num (nth 3 r) prec)))) rows))
          (entmakex (list '(0 . "MTEXT") '(100 . "AcDbEntity") '(100 . "AcDbMText") (cons 10 pt)
                          (cons 40 (getvar "TEXTSIZE")) '(41 . 0.0) '(71 . 1) '(72 . 5)
                          (cons 1 (cx:join (append lines (list (strcat "Total : " (itoa tc) " pcs, length " (cx:num tl prec) ", area " (cx:num ta prec)))) "\\P"))
                          (cons 7 (getvar "TEXTSTYLE"))))
          (cx:end)))))
  (princ))


;;; ---- Shared helpers (used by the command above; identical in every CADXChange tool) ----

(defun cx:dxf (code ed)
  (cdr (assoc code ed)))

;; The vertices of an LWPOLYLINE entity list as ((x y bulge start-width end-width) ...).
(defun cx:lw-verts (ed / out cur)
  (foreach g ed
    (cond
      ((= (car g) 10)
       (if cur (setq out (cons cur out)))
       (setq cur (list (cadr g) (caddr g) 0.0 0.0 0.0)))
      ((and cur (= (car g) 40)) (setq cur (list (nth 0 cur) (nth 1 cur) (nth 2 cur) (cdr g) (nth 4 cur))))
      ((and cur (= (car g) 41)) (setq cur (list (nth 0 cur) (nth 1 cur) (nth 2 cur) (nth 3 cur) (cdr g))))
      ((and cur (= (car g) 42)) (setq cur (list (nth 0 cur) (nth 1 cur) (cdr g) (nth 3 cur) (nth 4 cur))))))
  (if cur (setq out (cons cur out)))
  (reverse out))

;; The arc a bulge makes between P1 and P2 as (center-x center-y radius start-angle sweep), or nil for a straight segment.
;; The sweep is signed: positive turns counter-clockwise.
(defun cx:bulge-arc (p1 p2 b / theta dx dy len nx ny d ccx ccy)
  (if (< (abs b) 1e-9)
    nil
    (progn
      (setq theta (* 4.0 (atan b))
            dx    (- (car p2) (car p1))
            dy    (- (cadr p2) (cadr p1))
            len   (sqrt (+ (* dx dx) (* dy dy))))
      (if (< len 1e-12)
        nil
        (progn
          (setq nx  (/ (- dy) len)
                ny  (/ dx len)
                d   (/ (/ len 2.0) (/ (sin (/ theta 2.0)) (cos (/ theta 2.0))))
                ccx (+ (/ (+ (car p1) (car p2)) 2.0) (* nx d))
                ccy (+ (/ (+ (cadr p1) (cadr p2)) 2.0) (* ny d)))
          (list ccx ccy (/ len (* 2.0 (sin (/ (abs theta) 2.0))))
                (atan (- (cadr p1) ccy) (- (car p1) ccx)) theta))))))

;; The number of segments of a polyline with N vertices.
(defun cx:seg-count (n closed)
  (if closed n (1- n)))

;; A polyline as a list of (x y) points; arcs are cut into short straight pieces.
(defun cx:lw-points (verts closed / out i n a v1 v2 k steps ang)
  (setq i 0 n (length verts))
  (repeat (cx:seg-count n closed)
    (setq v1  (nth i verts)
          v2  (nth (rem (1+ i) n) verts)
          a   (cx:bulge-arc v1 v2 (nth 2 v1))
          out (cons (list (car v1) (cadr v1)) out))
    (if a
      (progn
        (setq steps (max 4 (fix (/ (abs (nth 4 a)) 0.15))) k 1)
        (while (< k steps)
          (setq ang (+ (nth 3 a) (* (nth 4 a) (/ (float k) steps)))
                out (cons (list (+ (car a) (* (nth 2 a) (cos ang))) (+ (cadr a) (* (nth 2 a) (sin ang)))) out)
                k   (1+ k)))))
    (setq i (1+ i)))
  (if (not closed)
    (setq out (cons (list (car (last verts)) (cadr (last verts))) out)))
  (reverse out))

;; An object as a list of (x y) points; circles and ellipses are cut into 120 pieces, arcs into short pieces.
;; Returns nil for an object it does not know.
(defun cx:ent-points (ed / type ctr r a1 a2 k pts ratio ang maj steps)
  (setq type (cx:dxf 0 ed))
  (cond
    ((= type "LWPOLYLINE") (cx:lw-points (cx:lw-verts ed) (= 1 (logand 1 (cx:dxf 70 ed)))))
    ((= type "LINE")
     (list (list (car (cx:dxf 10 ed)) (cadr (cx:dxf 10 ed))) (list (car (cx:dxf 11 ed)) (cadr (cx:dxf 11 ed)))))
    ((= type "CIRCLE")
     (setq ctr (cx:dxf 10 ed) r (cx:dxf 40 ed) k 0)
     (repeat 120
       (setq ang (* 2.0 pi (/ k 120.0))
             pts (cons (list (+ (car ctr) (* r (cos ang))) (+ (cadr ctr) (* r (sin ang)))) pts)
             k   (1+ k)))
     (reverse pts))
    ((= type "ARC")
     (setq ctr (cx:dxf 10 ed) r (cx:dxf 40 ed) a1 (cx:dxf 50 ed) a2 (cx:dxf 51 ed))
     (if (<= a2 a1) (setq a2 (+ a2 (* 2.0 pi))))
     (setq steps (max 8 (fix (/ (- a2 a1) 0.05))) k 0)
     (repeat (1+ steps)
       (setq ang (+ a1 (* (- a2 a1) (/ (float k) steps)))
             pts (cons (list (+ (car ctr) (* r (cos ang))) (+ (cadr ctr) (* r (sin ang)))) pts)
             k   (1+ k)))
     (reverse pts))
    ((= type "ELLIPSE")
     (setq ctr (cx:dxf 10 ed) maj (cx:dxf 11 ed) ratio (cx:dxf 40 ed) a1 (cx:dxf 41 ed) a2 (cx:dxf 42 ed))
     (if (<= a2 a1) (setq a2 (+ a2 (* 2.0 pi))))
     (setq k 0)
     (repeat 121
       (setq ang (+ a1 (* (- a2 a1) (/ k 120.0)))
             pts (cons (list (+ (car ctr) (* (car maj) (cos ang)) (* (- (cadr maj)) ratio (sin ang)))
                             (+ (cadr ctr) (* (cadr maj) (cos ang)) (* (car maj) ratio (sin ang))))
                       pts)
             k   (1+ k)))
     (reverse pts))))

(defun cx:lw-length (verts closed / total i n a v1 v2)
  (setq total 0.0 i 0 n (length verts))
  (repeat (cx:seg-count n closed)
    (setq v1    (nth i verts)
          v2    (nth (rem (1+ i) n) verts)
          a     (cx:bulge-arc v1 v2 (nth 2 v1))
          total (+ total (if a
                           (* (nth 2 a) (abs (nth 4 a)))
                           (distance (list (car v1) (cadr v1)) (list (car v2) (cadr v2))))))
    (setq i (1+ i)))
  total)

;; True for a closed polyline, a circle and a full ellipse.
(defun cx:ent-closed (ed / type)
  (setq type (cx:dxf 0 ed))
  (cond
    ((= type "LWPOLYLINE") (= 1 (logand 1 (cx:dxf 70 ed))))
    ((= type "CIRCLE") T)
    ((= type "ELLIPSE") (< (abs (- (- (cx:dxf 42 ed) (cx:dxf 41 ed)) (* 2.0 pi))) 1e-6))))

;; The length of a line, arc, polyline, circle (its circumference) or ellipse; nil for other objects.
(defun cx:ent-length (ed / type pts total i s)
  (setq type (cx:dxf 0 ed))
  (cond
    ((= type "LINE") (distance (cx:dxf 10 ed) (cx:dxf 11 ed)))
    ((= type "CIRCLE") (* 2.0 pi (cx:dxf 40 ed)))
    ((= type "ARC")
     (setq s (- (cx:dxf 51 ed) (cx:dxf 50 ed)))
     (if (<= s 0.0) (setq s (+ s (* 2.0 pi))))
     (* (cx:dxf 40 ed) s))
    ((= type "LWPOLYLINE") (cx:lw-length (cx:lw-verts ed) (cx:ent-closed ed)))
    ((= type "ELLIPSE")
     (setq pts (cx:ent-points ed) total 0.0 i 0)
     (repeat (1- (length pts))
       (setq total (+ total (distance (nth i pts) (nth (1+ i) pts))) i (1+ i)))
     total)))

;; The area of a closed polyline with its arc segments.
(defun cx:lw-area (verts / sum i n a v1 v2)
  (setq sum 0.0 i 0 n (length verts))
  (repeat n
    (setq v1  (nth i verts)
          v2  (nth (rem (1+ i) n) verts)
          sum (+ sum (/ (- (* (car v1) (cadr v2)) (* (car v2) (cadr v1))) 2.0))
          a   (cx:bulge-arc v1 v2 (nth 2 v1)))
    (if a
      (setq sum (+ sum (* 0.5 (nth 2 a) (nth 2 a) (- (nth 4 a) (sin (nth 4 a)))))))
    (setq i (1+ i)))
  (abs sum))

;; The area of a closed polyline, a circle or a full ellipse; nil for other objects.
(defun cx:ent-area (ed / type a)
  (setq type (cx:dxf 0 ed))
  (cond
    ((not (cx:ent-closed ed)) nil)
    ((= type "LWPOLYLINE") (cx:lw-area (cx:lw-verts ed)))
    ((= type "CIRCLE") (* pi (cx:dxf 40 ed) (cx:dxf 40 ed)))
    ((= type "ELLIPSE")
     (setq a (distance '(0.0 0.0 0.0) (cx:dxf 11 ed)))
     (* pi a a (cx:dxf 40 ed)))))

;; Merge sort of LST with PRED (a function of two items that is true when the first goes first).
(defun cx:sort (lst pred / half a b out)
  (cond
    ((or (null lst) (null (cdr lst))) lst)
    (T
     (setq half (/ (length lst) 2) a nil b lst)
     (repeat half (setq a (cons (car b) a) b (cdr b)))
     (setq a (cx:sort (reverse a) pred) b (cx:sort b pred) out nil)
     (while (and a b)
       (if (apply pred (list (car b) (car a)))
         (setq out (cons (car b) out) b (cdr b))
         (setq out (cons (car a) out) a (cdr a))))
     (append (reverse out) a b))))

;; Close the undo step and put the system variables back.
(defun cx:end ()
  (foreach v cx:sv (setvar (car v) (cdr v)))
  (command "_.UNDO" "_End")
  (setq cx:sv nil)
  (princ))

;; Error handler: restores everything, stays quiet on Esc.
(defun cx:err (msg)
  (if (> (getvar "CMDACTIVE") 0) (command))
  (cx:end)
  (if (and msg (not (wcmatch (strcase msg) "*BREAK*,*CANCEL*,*EXIT*")))
    (princ (strcat "\nError: " msg)))
  (princ))

;; Use the objects already selected, or ask the user to select; FILTER is an ssget filter list or nil.
(defun cx:pick (msg filter / ss)
  (setq ss (if filter (ssget "_I" filter) (ssget "_I")))
  (if (null ss)
    (progn
      (princ msg)
      (setq ss (if filter (ssget filter) (ssget)))))
  ss)

;; Selection set to a list of entity names.
(defun cx:ss->list (ss / i out)
  (setq i 0)
  (if ss
    (repeat (sslength ss)
      (setq out (cons (ssname ss i) out)
            i   (1+ i))))
  (reverse out))

;; Real X as text with at most PREC decimals and no trailing zeros ("2.50" -> "2.5", "3.00" -> "3").
(defun cx:num (x prec / s)
  (setq s (rtos x 2 prec))
  (if (wcmatch s "*.*")
    (progn
      (while (= (substr s (strlen s)) "0") (setq s (substr s 1 (1- (strlen s)))))
      (if (= (substr s (strlen s)) ".") (setq s (substr s 1 (1- (strlen s)))))))
  (if (or (= s "-0") (= s "")) "0" s))

;; Replace every OLD in STR by NEW (case sensitive).
(defun cx:replace (str old new / n out pos)
  (setq n (strlen old) out "" pos 1)
  (if (= n 0)
    str
    (progn
      (while (<= pos (1+ (- (strlen str) n)))
        (if (= (substr str pos n) old)
          (setq out (strcat out new) pos (+ pos n))
          (setq out (strcat out (substr str pos 1)) pos (1+ pos))))
      (strcat out (substr str pos)))))

;; Ask for one of the keywords in BITS ("Yes No"), default DEF; returns the keyword.
(defun cx:ask-kw (msg bits def / v)
  (initget 0 bits)
  (setq v (getkword (strcat "\n" msg " [" (cx:replace bits " " "/") "] <" def ">: ")))
  (if v v def))

;; Save the system variables in VARS ((name . value) ...), set them, and open one undo step.
;; The caller declares cx:sv as a local so the saved values live exactly as long as the command.
(defun cx:start (vars)
  (setq cx:sv (mapcar (function (lambda (v) (cons (car v) (getvar (car v))))) vars))
  (command "_.UNDO" "_Begin")
  (foreach v vars (setvar (car v) (cdr v)))
  (princ))

(defun cx:join (lst delim / out)
  (setq out "")
  (foreach s lst
    (setq out (if (= out "") s (strcat out delim s))))
  (if lst out ""))

(princ "\nCXSUM loaded. Type CXSUM to start.")
(princ)

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