Question

Autolisp对CAD二次开发如何返回图元之间的交点，求大神帮忙

Answer 1

vla-intersectwith
(vl-load-com)
(defun c:getint( / ent1 ent2 ps)
(setq ent1 (car (entsel "选择第一实体:")))
(setq ent2 (car (entsel "选择第二实体:")))
(print)
(setq ps (obj_int ent1 ent2))
)
;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
;功能:返回两个对象的所有交点
;参数: ent1、ent2 均为ename对象
(defun obj_int (ent1 ent2 / ax_ent_1 ax_ent_2 intpoints points i)
(setq ax_ent_1 (vlax-ename->vla-object ent1)
ax_ent_2 (vlax-ename->vla-object ent2)
)
(setq intpoints (vla-intersectwith ax_ent_1 ax_ent_2 acextendnone))
(setq intpoints (vlax-variant-value intpoints))
(setq i 0)
(if (> (vlax-safearray-get-u-bound intpoints 1) 0)
(repeat (/ (+ 1
(- (vlax-safearray-get-u-bound intpoints 1)
(vlax-safearray-get-l-bound intpoints 1)
)
)
3
)
(setq points (append points (list (list
(vlax-safearray-get-element intpoints i)
(vlax-safearray-get-element intpoints (+ i 1))
(vlax-safearray-get-element intpoints (+ i 2))
)))
)
(setq i (+ 3 i))
)
)
points
)

Answer 2

采纳我之后告诉你，，这个我真的知道啊