Hi, the link you have is setting variable this_cross, and L526 sets first_cross from it if it was not set and there is LEFT or RIGHT cross (not no-cross and not COLLINEAR). Looks expected to me.
On Sat, Apr 18, 2020 at 6:32 PM Kohei KaiGai <[email protected]> wrote: > > Hello, > > I noticed a strange code at liblwgeom/lwalgorithm.c > https://github.com/postgis/postgis/blob/master/liblwgeom/lwalgorithm.c#L509 > > lwline_crossing_direction() is the main logic of ST_LineCrossingDirection. > It walks on all the edges of the supplied geometry (line), and calls > lw_segment_intersects to check intersections. > > It looks to me the local variable 'first_cross' is used to remember the first > result from the lw_segment_intersects, however, it saves different value > on the second if-block at L526. > > Is it expected? Or, just mistake by copy & paste? > > Best regards, > -- > HeteroDB, Inc / The PG-Strom Project > KaiGai Kohei <[email protected]> > _______________________________________________ > postgis-users mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/postgis-users -- Darafei Praliaskouski Support me: http://patreon.com/komzpa _______________________________________________ postgis-users mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/postgis-users
