如何获取封闭多段线内部一点

yu960312

想实现一个功能，点击封闭多段线上任意一点

如果点击的点在多段线的直线上，就在所点击的直线中点往内偏移2.0的位置，画一个直径0.5mm的圆

如果点击的点在多段线的圆弧上，就在所点击的圆弧中点往内偏移2.0的位置，画一个直径0.5mm的圆
目前不知道如何获取多段线内的一点，请求各位大佬指导一下

kozmosovia

先求出线两边的两个点，再判断哪个点在内部

yu960312

kozmosovia 发表于 2024-5-2 14:47
先求出线两边的两个点，再判断哪个点在内部

了解，正在解决中

yu960312

已解决，代码如下
(defun C:Z4 ( / ss en n nn P1 P2 P3 P4 P5)
(vl-load-com)
(princ "\n封闭多段线内画圆")
(defun exit_msg (msg)
(princ (STRCAT "\n" msg))
(vl-exit-with-value "")
)
(DEFUN TAO-GET-LENGTH (ENT)
(if (= (TYPE ENT) 'ENAME)
(PROGN (setq ENT (vlax-ename->vla-object ENT)))
)
(if
(WCMATCH
(vla-get-ObjectName ENT)
"AcDbPolyline,AcDbEllipse,AcDbCircle,AcDbArc,AcDbLine,AcDb2dPolyline,AcDbSpline"
)
(PROGN
(vlax-curve-getDistAtParam ENT (vlax-curve-getEndParam ENT))
)
)
)
;;//////////////////////////////////
(defun entselEx (msg fil ermsg / el ss)
(while (and (setvar "errno" 0)
(not (and (setq el  (entsel msg))
(if (= (type el) 'str)
el
(if (setq ss (ssget (cadr el) fil))
ss
(progn (princ ermsg) (setq ss nil))
)
)
)
)
(/= (getvar "errno") 52)
)
)
el
)
;;//////////////////////////////////
(setq dd 2.0)
(setvar "cmdecho" 0)
(setq ss (entselEx "\n选择多段线:" '((0 . "LWPOLYLINE")) "\n所选对像不符合要求！请重新选择："))
(setq en (car ss));;多段线图元名
(setq obj (vlax-ename->vla-object en));;obj
(if (not(vlax-curve-isClosed obj))(exit_msg "所选多段线未闭合，请重新选择！！！"))
(setq len (tao-get-length en));;多段线长度
(setq n(vlax-curve-getclosestpointto en (cadr ss)));;点在多段线上的一点
(setq nn(fix (vlax-curve-getparamatpoint en n)));点选在多段线上的第几段
(setq offsetplineObj (car (vlax-safearray->list(vlax-variant-value(vla-OFFSET obj 0.0001)))))
(setq bulge(vla-getbulge obj nn));;多段线凸度值
(setq P1(trans (vlax-curve-getpointatparam en nn) 0 1));第一个端点坐标
(setq P2(trans (vlax-curve-getpointatparam en (1+ nn)) 0 1));第二个端点坐标
(setq P3(polar P1 (angle P1 P2) (* 0.5 (distance P1 P2))));线段中点坐标
(if (> (vlax-curve-getdistatparam obj (vlax-curve-getEndParam obj))
(vlax-curve-getdistatparam offsetplineObj (vlax-curve-getEndParam offsetplineObj))
)
(progn
(princ "\n顺时针")
(cond
((= bulge 0)
;;(princ "\nG01")
(setq P4(polar P3 (+ (angle P1 P3) (angtof "270")) dd))
(vl-cmdf "CIRCLE" P4 0.5)
;(vl-cmdf "LINE" P3 P4 "")
)
((< bulge 0)
;;(princ "\nG02")
(setq dis(vlax-curve-getdistatpoint obj P1))
(setq dis1(vlax-curve-getdistatpoint obj P2))
(if (= dis1 0)(setq dis1 len))
(setq dis2(+ dis (/ (- dis1 dis) 2)))
(setq P4(vlax-curve-getpointatdist obj dis2))
(setq P5(polar P3 (+ (angle P1 P3) (angtof "270")) (- dd (distance P3 P4))))
(vl-cmdf "CIRCLE" P5 0.5)
;(vl-cmdf "LINE" P4 P5 "")
)
((> bulge 0)
;;(princ "\nG03")
(setq dis(vlax-curve-getdistatpoint obj P1))
(setq dis1(vlax-curve-getdistatpoint obj P2))
(if (= dis1 0)(setq dis1 len))
(setq dis2(+ dis (/ (- dis1 dis) 2)))
(setq P4(vlax-curve-getpointatdist obj dis2))
(setq P5(polar P3 (+ (angle P1 P3) (angtof "270")) (+ dd (distance P3 P4))))
(vl-cmdf "CIRCLE" P5 0.5)
(vl-cmdf "LINE" P4 P5 "")
)
)
)
(progn
(princ "\n逆时针")
(cond
((= bulge 0)
;;(princ "\nG01")
(setq P4(polar P3 (+ (angle P1 P3) (angtof "90")) dd))
(vl-cmdf "CIRCLE" P4 0.5)
;(vl-cmdf "LINE" P3 P4 "")
)
((< bulge 0)
;;(princ "\nG02")
(setq dis(vlax-curve-getdistatpoint obj P1))
(setq dis1(vlax-curve-getdistatpoint obj P2))
(if (= dis1 0)(setq dis1 len))
(setq dis2(+ dis (/ (- dis1 dis) 2)))
(setq P4(vlax-curve-getpointatdist obj dis2))
(setq P5(polar P3 (+ (angle P1 P3) (angtof "90")) (+ dd (distance P3 P4))))
(vl-cmdf "CIRCLE" P5 0.5)
;(vl-cmdf "LINE" P4 P5 "")
)
((> bulge 0)
;;(princ "\nG03")
(setq dis(vlax-curve-getdistatpoint obj P1))
(setq dis1(vlax-curve-getdistatpoint obj P2))
(if (= dis1 0)(setq dis1 len))
(setq dis2(+ dis (/ (- dis1 dis) 2)))
(setq P4(vlax-curve-getpointatdist obj dis2))
(setq P5(polar P3 (+ (angle P1 P3) (angtof "90")) (- dd (distance P3 P4))))
(vl-cmdf "CIRCLE" P5 0.5)
;(vl-cmdf "LINE" P4 P5 "")
)
)
)
)
(vla-delete offsetplineObj)
(princ)
)

xyp1964

(osnap pt "mid")
再求法线内偏移点并画圆

LYC688

用这个就好啦。很强大

paulpipi

yu960312 发表于 2024-5-2 18:46
已解决，代码如下
(defun C:Z4 ( / ss en n nn P1 P2 P3 P4 P5)
(vl-load-com)

感谢分享，试用一下

yu960312

LYC688 发表于 2024-5-8 01:03
用这个就好啦。很强大

就是为了取代统赢

LYC688

yu960312 发表于 2024-5-10 19:39
就是为了取代统赢

你这个又不能框选