CAD中自动画管线图的LISP程序
画一些管路原理图时,当代表不同管路的直线在图中相交时,需将在交点处的某一直线断开,再用一半圆连接两断点,使用下面这个LISP编写的程序,只用键入"brel"的命令,其它的就由电脑去完成了。程序中使用"break"命令截断需要被断开的管线,再用"arc"命令画一半圆连接两断点。变量p读取管线交点;p1、p2为点p的左右或上下两点;p3为连接p1、p2半圆的中点。由于使用"break"命令时若AUTOCAD环境处于对象捕捉方式(OSMODE≠0),则"break"命令截断的p1、p2两点可能为变为p1、p2附近的捕捉点。所以程序开始时用变量myosmode记录系统变量OSMODE,而后设置OSMODE为0,程序结束后再设置还原OSMODE。变量horn判断用户需要断开的是水平线还是垂直线。
(defun c:brel(/myosmode horv p p1 p2 p3)
(setq myosmode (getvar "OSMODE"))
(setvar "OSMODE" 0)
(setq p (getpoint "\nSelect point to break:"))
(initget 1 "H V")
(setq horv (getkword " Direction?"))
(if (= horv "H")
(progn
(setq p1 (list (- (car p) 1.5) (cadr p)))
(setq p2 (list (+ (car p) 1.5) (cadr p)))
(setq p3 (list (car p) (+ (cadr p) 1.5)))
)
(progn
(setq p1 (list (car p) (- (cadr p) 1.5)))
(setq p2 (list (car p) (+ (cadr p) 1.5)))
(setq p3 (list (+ (car p) 1.5) (cadr p)))
)
)
(command "break" p1 p2)
(command "arc" p1 p3 p2)
(setvar "OSMODE" myosmode)
(princ)
)
(princ "\nStart command with brel which will break a line and join it with an arc.") 画管路图时,常画俯视图和相应的45°角视图。其实45°角视图中包含的信息只比俯视图中多了每根管路的水平高度。下面这个用LISP编写的程序可以自动将俯视图转化为同一水平高度的45°角视图,使用者只需在转化后的图上将每组管路在竖直方向上移动相应的高度,一幅45°角视图就轻松完成了。
由于每根管路用一直线表示,所以只需改变直线的起点和终点坐标为相应的45°角视图中的坐标。程序中变量p0记录45°角视图的坐标原点,由用户输入。p1记录直线的起点坐标,p2记录直线的终点坐标。
(defun c:V45( / cmdmode sset ssl ent p0,p1,p2,x1,x2,y0,y1,y2,z1,z2)
(setq cmdmode (getvar "cmdecho"))
(setvar "cmdecho" 0)
;select lines by user
(prompt "\nSelect lines:")
(setq sset (ssget))
(if (not(null sset))
(progn
(setq ssl (sslength sset))
;input base point by user
(setq p0 (getpoint "\nThe base point: "))
(setq y0 (cadr p0))
(while (> ssl 0)
(setq ent(entget (ssname sset (setq ssl (1- ssl)))))
;filter the lines
(if (= (cdr (assoc 0 ent)) "LINE")
;change the start point and end point of the line
(progn
(setq x1 (cadr(assoc 10 ent)))
(setq y1 (caddr(assoc 10 ent)))
(setq z1 (cadddr(assoc 10 ent)))
(setq x2 (cadr(assoc 11 ent)))
(setq y2 (caddr(assoc 11 ent)))
(setq z2 (cadddr(assoc 11 ent)))
(setq p1 (list (+ x1 (/ (* (sqrt 2) (- y1 y0)) 4)) (+ y0 (/ (* (sqrt 2) (- y1 y0))4)) z1))
(setq p2 (list (+ x2 (/ (* (sqrt 2) (- y2 y0)) 4)) (+ y0 (/ (* (sqrt 2) (- y2 y0))4)) z2))
(setq ent (entmod (subst (cons 10 p1)
(assoc 10 ent) ent)))
(entmod (subst (cons 11 p2)
(assoc 11 ent) ent))
(redraw (cdr(assoc -1 ent)) 1))
)
)
)
)
(setvar "CMDECHO" cmdmode)
)
(princ "\n\tc:V45 loaded. Start command with V45.") 怎么回事呀,复制出来不能用呀!!!!!!!!!!!!!:@
页:
[1]