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add safety check

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Motiejus Jakštys 2021-02-26 16:12:45 +02:00
parent c2c883335c
commit 3286890f52
1 changed files with 3 additions and 0 deletions
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IV/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;