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功能:以选取的参照框为分割基准,自动修剪框内/外的曲线。
还有些待修复的BUG,如:(1)当曲线的起点和终点在参照框上时 (2)当多段线沿着参照框弯折时(见图片演示的BUG)。
相对AutoCAD中Express工具中自带的extrim,可以删除框内的曲线。各位亦可根据此源码进行修改后判断曲线是在框内/上/外。
若有更好的建议,还望提供下思路,谢谢!
源码如下:
(defun c:t1 (/ sslst orien)
(princ
"\n功能:自动修剪与选定框相交的曲线,可选择修剪框内或框外的曲线部分."
)
(setvar "osmode" 15359)
(setvar "cmdecho" 0)
(vl-load-com)
(command "undo" "be")
(while
(progn (setq ent (entsel "\n请选择参照曲线框:\n"))
(not (if (= ent nil)
nil
(wcmatch (cdr (assoc 0 (entget (car ent))))
"LWPOLYLINE,POLYLINE,SPLINE,ARC,CIRCLE"
) ;限定只能选取的曲线类型
)
)
)
(princ
"\n提示:选取的不是多段线、样条曲线、圆弧、圆弧或未选取任何图元,请重新选取第一条曲线:\n"
)
)
(princ "\n请选择曲线对象:")
(if (not (setq ss (ssget '((0 . "CIRCLE,ARC,*LINE")))))
(progn (princ "\n未选中任何曲线,程序退出。") (exit))
)
(setq pt (getpoint "\n指定要修剪的方向:")
obj (vlax-ename->vla-object (car ent))
len (vlax-curve-getdistatparam obj (vlax-curve-getendparam obj))
area (vlax-curve-getarea obj)
i 0
j 0
)
(command "_.offset" 0.001 ent pt "")
(setq ent_last (entlast))
(setq obj_last (vlax-ename->vla-object ent_last)
len_last (vlax-curve-getdistatparam
obj_last
(vlax-curve-getendparam obj_last)
)
area_last (vlax-curve-getarea obj_last)
)
(if (and (< len_last len) (< area_last area)) ;若选取的参照点是在框内
(setq orien T)
(setq orien nil)
)
(setvar "osmode" 0)
(repeat (sslength ss)
(setq ssnam (ssname ss i))
(setq ssobj (vlax-ename->vla-object ssnam))
(if (setq jiaodian (vlax-invoke ssobj 'intersectwith obj 0))
;判断是否存在交点
(if (and (= (length jiaodian) 3)
(or (equal jiaodian (vlax-curve-getStartPoint ssobj))
(equal jiaodian (vlax-curve-getEndPoint ssobj))
)
)
(setq j (+ j 1))
(progn
(setq ptAllInt (vlax-invoke ssobj 'intersectwith obj_last 0)
ptOneInt
(list (list (car ptAllInt)
(cadr ptAllInt)
(nth 2 ptAllInt)
)
)
)
(setq newent (cons ssnam ptOneInt))
(command "TRIM" ent "" newent "")
)
)
(if orien
(progn
(setq ptstart (vlax-curve-getstartpoint ssobj))
(command "_.offset" 0.001 ent ptstart "")
(setq ent_tmp (entlast))
(setq obj_tmp (vlax-ename->vla-object ent_tmp)
len_tmp (vlax-curve-getdistatparam
obj_tmp
(vlax-curve-getendparam obj_tmp)
)
area_tmp (vlax-curve-getarea obj_tmp)
)
(vla-delete obj_tmp)
(if (and (< len_tmp len) (< area_tmp area))
(vla-delete ssobj)
)
)
)
)
(setq i (1+ i))
)
(vla-delete obj_last)
(setvar "osmode" 15359)
(command "undo" "e")
(princ)
)
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