我编写的绘制墙线的程序，后来发现用线型就能解决

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(defun setline()
(setvar "orthomode" 0)
(setvar "osmode" 0)
(setvar "snapmode" 0)
(setvar "gridmode" 0)
(command "layer" "s" lline "")   
)


(defun c:dll()
(setline)     
(setq p1 (getpoint "\n 输入第一点:"))
(setq p2 (getpoint p1 "\n 输入下一点:"))
;;(if filevalue (progn
(setq s (* 1.0 (/ ppscal 100)))
(setq d (* 0.05 (/ ppscal 100)))
;;(setq j 0)
;;(while (/= p2 nil)
(setq j 0)
(setq ps (distance p1 p2))
(setq m (+ (angle p1 p2) 1.570796))
(setq n (angle p1 p2))
(setq nn (angle p2 p1))
(setq p11 (polar p1 m d))
(setq p22 (polar p2 m d))
(command "line" p1 p2 \r)
(command "line" p11 p22 \r)
  (setq ent1 (entlast))
  (while (/= p2 nil)
(setq b (/ ps s))
(if (<= b 2.4)(progn
    (setq pz (list (/ (+(car p1) (car p2)) 2) (/ (+(cadr p1) (cadr p2)) 2)))     
    (setq pzz (polar pz m d))
    (command "line" pz pzz \r)
))
(if (> b 2.4)(progn
    (setq bb (- b (fix b)))
    (setq bb (+ bb 1))
    (setq bb (/ bb 2))
    (setq p3 (polar p1 n bb))
    (setq p4 (polar p2 nn bb))
    (setq p33 (polar p3 m d))
    (setq p44 (polar p4 m d))
    (command "line" p3 p33 \r)
    (command "line" p4 p44 \r)
    (setq j (- (fix b) 1))
    (while (/= j 0)
        (setq p3 (polar p3 n s))
        (setq p33 (polar p3 m d))
        (command "line" p3 p33 \r)
        (setq j (- j 1))
    )
))
(setq p1 p2)
(setq p2 (getpoint p1 "\n 输入下一点:"))
(setq ps (distance p1 p2))
(setq m (+ (angle p1 p2) 1.570796))
(setq n (angle p1 p2))
(setq nn (angle p2 p1))
(setq p11 (polar p1 m d))
(setq p22 (polar p2 m d))
(command "line" p1 p2 \r)
(command "line" p11 p22 \r)
  (setq ent2 (entlast))
(command "chamfer" "d" 0 0)
(command "chamfer" ent1 ent2)
(setq ent1 ent2)
)
(setq j 0)
)


   (defun C:Gongqiang()
      (setline)
          (setq p1 (getpoint "\n 选择墙的第一点 :"))
          (setq p2 (getpoint p1 "\n 选择墙的第二点 :"))
          (setq u (+ (angle p1 p2) (/ 3.14159265 2)))
          (setq l (/ (distance p1 p2) 4))
          (setq s l)
          (repeat 3
                 (setq p11 (polar p1 (angle p1 p2) l))
                 (setq p12 (polar p11 u 0.25))
                 (setq p13 (polar p11 (- u 3.14159265) 0.25))
                 (setq l (+ l s))
                 (command "line" p12 p13 \r)
           )
          (command "redraw" )
          (princ)
     )

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