方法1：投機的方法

先標注一個尺寸,再把該尺寸打散,刪除其他的,只留一個箭頭就可以了。然后就可以旋轉,復制,想怎么樣就怎么樣了。

方法2：在autocad中直接畫箭頭

在CAD中直接畫箭頭的命令的一個方法?。?！

    眾所周知，在天正中可直接繪制箭頭，而在AutoCAD中不可。在命令行直接輸入命令就可畫出你想要的尺寸的箭頭的方法，具體實施如下：

1、首先拷貝下列lisp程序，用ar為名以記事本格式保存，然后改后綴名為.lsp，作為一個lisp程序文件；程序如下：

(defun ureal (bit kwd msg def / inp)

(if def

(setq msg (strcat "n" msg "<" (rtos def) ">: ")

bit (* 2 (fix (/ bit 2)))

)

(if (= " " (substr msg (strlen msg) 1))

(setq msg (strcat "n" (substr msg 1 (1- (strlen msg))) ": "))

(setq msg (strcat "n" msg ": "))

)

)

(initget bit kwd)

(setq inp (getreal msg))

(if inp inp def)

)

(defun upoint (bit kwd msg def bpt / inp)

(if def

(setq pts (strcat

(rtos (car def))

","

(rtos (cadr def))

(if

(and (caddr def) (= 0 (getvar "FLATLAND")))

(strcat "," (rtos (caddr def)))

""

)

)

msg (strcat "n" msg "<" pts ">: ")

bit (* 2 (fix (/ bit 2)))

)

(if (= " " (substr msg (strlen msg) 1))

(setq msg (strcat "n" (substr msg 1 (1- (strlen msg))) ": "))

(setq msg (strcat "n" msg ": "))

)

)

(initget bit kwd)

(setq inp

(if bpt

(getpoint msg bpt)

(getpoint msg)

)

)

(if inp inp def)

)

(setq cm(getvar "cmdecho"))

(setvar "cmdecho" 0)

(defun C:AR ( / #dwgsc w v pt1 pt2 pt3 )

(if(= arscl nil)(setq arscl 0.1875))

(setq #dwgsc(getvar "DIMSCALE")

W(getvar "PLINEWID")

V(getvar "OSMODE")

L(getvar "CLAYER"))

(setq arscl(ureal 7 "" "請輸入箭頭長度" arscl))

(setvar "OSMODE" 1)

(setq pt1 (upoint 1 "" "指定箭頭頂點" nil nil))

(setvar "OSMODE" 512)

(setq PT(entsel "n選擇直線上要畫箭頭一端的任意一點"))

(setq PT2(cadr PT))

(setq ED(entget(car PT)))

(setq PT3 (polar PT1 (angle PT1 PT2) (* #dwgsc arscl)))

(command "PLINE" pt1 "w" "0" (* #dwgsc (/ arscl 3)) pt3 "")

(setvar "OSMODE" V)

(setvar "CLAYER" L)

(setvar "plinewid" W)

(princ)

)

(setvar "cmdecho" cm)

(princ)

2、將ar.lsp拷貝至CAD目錄下的support目錄下；

3、在CAD目錄下的support目錄內找到文件acad2000doc.lsp文件（CAD2002下，在別的版本CAD中可能不是這個名，這是CAD的自動加載文件）；

4、用記事本程度打開acad2000doc.lsp文件，加入一行：(load "ar.lsp")

（注意字符要為英文字符）

5、保存后，重新啟動CAD，在命令行就可輸入ar命令直接畫箭頭了。