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add safety check

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Motiejus Jakštys 2021-05-19 22:57:45 +03:00 committed by Motiejus Jakštys
parent fab653ee3a
commit 02f2ac3e60
1 changed files with 3 additions and 0 deletions
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wm.sql
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@ -117,6 +117,9 @@ begin
select geom from st_dumppoints(bends[i]) order by path[1] asc limit 3 select geom from st_dumppoints(bends[i]) order by path[1] asc limit 3
) into phead; ) into phead;
-- if the bend got too short, stop processing it
exit when array_length(phead, 1) < 3;
-- if inflection angle between ptail[1:3] "large", stop processing this bend -- if inflection angle between ptail[1:3] "large", stop processing this bend
exit when abs(st_angle(phead[1], phead[2], phead[3]) - pi) > small_angle; exit when abs(st_angle(phead[1], phead[2], phead[3]) - pi) > small_angle;