PL线的ARC段的数据如何得到。

matichen

只看到陈老师那本书里写的DXF 42 为弓弦比， 不知该怎样用。 （90 度时为0.414  180度时为 1 真没搞懂表示什么），我想求这段ARC的长和半径。

alin

Bulge (optional; default is 0). The bulge is the tangent of one fourth the included angle for an arc segment, made negative if the arc goes clockwise from the start point to the endpoint. A bulge of 0 indicates a straight segment, and a bulge of 1 is a semicircle

tan (90/4) = tan (22.5 deg) = 0.414
tan (180/4) = tan (45 deg) = 1

龙龙仔

http://www.mjtd.com/bbs/dispbbs.asp?boardID=3&RootID=6245&ID=6770

http://www.mjtd.com/bbs/dispbbs.asp?boardID=3&RootID=7938&ID=7961

matichen