大家都知道,在天正中可直接繪制箭頭,而在AutoCAD中卻不行。現在介紹一個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,然後改後綴名為.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、保存後,重新啟動CAD,在命令行就可輸入ar命令直接畫箭頭了。
[CAD教程] 特殊字符的輸入AutoCAD
CAD中特殊字符的輸入一般通過字體的編譯來解決,即修改字體形文件shp文件,再通過cad命令編譯成shx文件,現有一種字體成功解決了希臘字母、羅馬字母、上下標等一系列特殊字母的輸入,具體對照如下:
代碼 字符
%%130 α
%%131 β
%%132 δ
%%133 φ
%%134 γ
%%135 η
%%136 π
%%141 Ⅰ
%%142 Ⅱ
%%143 Ⅲ
%%144 Ⅳ
%%145 Ⅴ
%%146 Ⅵ
%%147 Ⅶ
%%148 Ⅷ
%%149 Ⅸ
%%150 Ⅹ
%%168 上標開始
%%169 上標結束
%%170 下標開始
%%171 下標結束
……