当我们在使用CAD软件绘制图纸时，经常会因为各种需求，需要了解一些软件的系统程序，对我们使用软件会有帮助的。那龙8CAD中关于lisp程序有哪些绘图技巧呢？今天就为大家简单介绍下。

CAD中的一些关于lisp程序的绘图技巧：

 1、计算CAD图形中所有线段总长度(加载后只需框选所有线段便可得出这些线段的总长度)

(defun c:LL ()

(setvar "cmdecho" 1)

(setq en (ssget (list '(0 . "spline,arc,line,ellipse,LWPOLYLINE"))))

(setq i 0)

(setq ll 0)

(repeat (sslength en)

(setq ss (ssname en i))

(setq endata (entget ss))

(command "lengthen" ss "")

(setq dd (getvar "perimeter"))

(setq ll (+ dd ll))

(setq i (1+ i))

)

(princ "所选线条总长为：")(princ ll)(princ)

)

2、标注CAD图形中所有线段(加载后只需框选所有线段便可得标注这些线段)

(defun c:LLL ()

(COMMAND "UCS" "")

(setvar "cmdecho" 1)

(SETVAR "OSMODE" 0)

(setq ACADObject (vlax-get-aCAD-object)

ACADDocument (vla-get-ActiveDocument ACADobject)

mSpace (vla-get-ModelSpace ACADdocument)

)

;;选取需要测量的样条曲线、圆弧、直线、椭圆

(setq en (ssget (list '(0 . "spline,arc,line,ellipse,LWPOLYLINE"))))

(setq i 0)

;;获取系统参数textsize

(setq shh (getvar "textsize"))

(setq str_hh (strcat "\n文字高度 <" (rtos shh 2) ">: "))

(setq hh (getdist str_hh))

(while hh

(setvar "textsize" hh)

(setq hh nil))

;;输入标注文字高度

;;循环开始

(repeat (sslength en)

(setq ss (ssname en i))

(setq endata (entget ss))

(command "lengthen" ss "")

(setq dd (getvar "perimeter"))

(princ (strcat "\n长度=" (rtos dd 2)))

;;寻找代表图层的字符串

(setq aa (assoc 0 endata))

;;获取图层名称

(setq aa1 (cdr aa))

;;判断线条种类

(cond

((= aa1 "SPLINE")

;;如果是spline

(progn

(setq arcObj (VLAX-ENAME->VLA-OBJECT ss))

(setq startPnt1 (vla-get-ControlPoints arcObj))

(setq p1

(vlax-safearray->list (vlax-variant-value startPnt1))

)

(setq x1 (car p1))

(setq y1 (CADr p1))

(setq z1 (CADdr p1))

(setq pp1 (list x1 y1 z1))

(repeat (- (/ (length p1) 3) 1)

;;循环，寻找最后一个控制点

(setq p1 (cdddr p1))

(setq x2 (car p1))

(setq y2 (CADr p1))

(setq z2 (CADdr p1))

)

(setq pp2 (list x2 y2 z2))

)

)

((= aa1 "LWPOLYLINE")

;;如果是LWPOLYLINE

(progn

(setq arcObj (VLAX-ENAME->VLA-OBJECT ss))

(setq startPnt1 (vla-get-Coordinates arcObj))

(setq p1

(vlax-safearray->list (vlax-variant-value startPnt1))

)

(setq x1 (car p1))

(setq y1 (CADr p1))

(setq z1 (CADdr p1))

(setq pp1 (list x1 y1 z1))

(repeat (- (/ (length p1) 3) 1)

;;循环，寻找最后一个控制点

(setq p1 (cdddr p1))

(setq x2 (car p1))

(setq y2 (CADr p1))

(setq z2 (CADdr p1))

)

(setq pp2 (list x2 y2 z2))

)

)

(t

;;如果是其他种类线条

(progn

(setq arcObj (VLAX-ENAME->VLA-OBJECT ss))

(setq startPnt1 (vla-get-StartPoint arcObj))

;;获取起点

(setq endPnt1 (vla-get-EndPoint arcObj))

;;获取终点

(setq pp1）

(vlax-safearray->list (vlax-variant-value startPnt1))

(setq）

pp2 (vlax-safearray->list (vlax-variant-value endPnt1))

(setq x1 (car pp1))

(setq y1 (CADr pp1))

(setq z1 (CADdr pp1))

(setq x2 (car pp2))

(setq y2 (CADr pp2))

(setq z2 (CADdr pp2))

(setq x (/ (+ x1 x2) 2))

(setq y (/ (+ y1 y2) 2))

(setq z (/ (+ z1 z2) 2))

(setq pt (list x y z))

;;取得线段两端的中点

(setq ang (angle pp1 pp2))

;;获取角度

(if (> (* (/ ang pi) 180) 180)）

(setq ang (+ ang pi))

(command "text"）

"j"

"bc"

pt

""

(* (/ ang pi) 180)

(strcat "" (rtos dd 2))

""

(setq i (1+ i))

(prin1)

(prompt "\n <>在图中直接写出长度")

(prin1)

3、连续打断程序

(defun c:br1 ()）

(command "break" pause "f" pause "@")

4、将CAD文字导入Excel表格

(defun c:Q2()

(setq ffn (getfiled "写出文件" "" "xls" 1))

(princ "\n选取文字...")

(setq ss (ssget))

(setq ff (open ffn "w"))

(setq i 0)

(repeat (sslength ss)

(setq ssn (ssname ss i))

(setq ssdata (entget ssn))

(setq sstyp (cdr (assoc 0 ssdata)))

(if (or (= sstyp "TEXT") (= sstyp "MTEXT"))

(progn）

(setq txt (cdr (assoc 1 ssdata)))

(princ txt ff)

(princ "\n" ff)

(setq i (1+ i))

(close ff)

(princ (strcat "\n写出文件: " ffn))

(prin1)

5、删除带颜色图元

以下程序在别人的贴子里贴过.为了说明问题,今天再贴一次。

改颜色的LISP程序

(defun c:c1()(ssget)(command "chprop" "p" "" "c" "1" "") (princ))

(defun c:c2()(ssget)(command "chprop" "p" "" "c" "2" "") (princ))

(defun c:c3()(ssget)(command "chprop" "p" "" "c" "3" "") (princ))

(defun c:c4()(ssget)(command "chprop" "p" "" "c" "4" "") (princ))

(defun c:c5()(ssget)(command "chprop" "p" "" "c" "5" "") (princ))

(defun c:c6()(ssget)(command "chprop" "p" "" "c" "6" "") (princ))

(defun c:c7()(ssget)(command "chprop" "p" "" "c" "7" "") (princ))

(defun c:c8()(ssget)(command "chprop" "p" "" "c" "8" "") (princ))

你用C1 命令就可以将图元改为红色了.其余类似。

删除红色图元

(defun C:D1 (/ m A M)

(setq m:err *error* *error* *merr*)

(setvar "cmdecho" 0)

(command "UNDO" "G")

(prompt "选择图形")

(setq A (ssget '((62 . 1)) ))

(if (/= A nil)(progn

(setq M (sslength A))

(command "erase" A "")

(princ "\n共删除红色图元<")(princ M)(princ ">个")

))

(command "UNDO" "E")

(princ) )

这样,键入 D1 命令,就可以删除红色的图元了。

以上就是在龙8CAD软件中，当我们在使用CAD软件绘图时，我们可以了解一些软件的程序，可以参考上述内容。今天就介绍这么多了。安装龙8CAD软件试试吧。更多CAD教程技巧，可关注龙8CAD官网进行查看。