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bugfix: two bends that touch cannot be both isolated

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Motiejus Jakštys 2021-05-19 22:57:51 +03:00 committed by Motiejus Jakštys
parent b8c3c26196
commit e0d0b90331
1 changed files with 17 additions and 5 deletions
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22
wm.sql
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@ -371,7 +371,10 @@ begin
-- first and last bends can never be isolated by definition
if skip_next or i = 1 or i = array_length(attrs, 1) then
skip_next = false;
-- invariant: two bends that touch cannot be isolated.
if st_npoints(bends[i]) > 3 then
skip_next = false;
end if;
continue;
end if;
@ -627,8 +630,17 @@ begin
-- remove last vertex of the previous bend and
-- first vertex of the next bend, because bends always
-- share a line segment together
bends[i-1] = st_removepoint(bends[i-1], st_npoints(bends[i-1])-1);
bends[i+1] = st_removepoint(bends[i+1], 0);
bends[i-1] = st_addpoint(
st_removepoint(bends[i-1], st_npoints(bends[i-1])-1),
st_pointn(bends[i], 1),
-1
);
bends[i+1] = st_addpoint(
st_removepoint(bends[i+1], 0),
st_pointn(bends[i], st_npoints(bends[i])-1),
0
);
-- the next bend's adjsize is now messed up; it should not be taken
-- into consideration for other local minimas. Skip over 2.
i = i + 2;
@ -750,10 +762,10 @@ begin
select 'non-linestring-' || a.path[1], a.geom
from st_dump(lines[i]) a
order by a.path[1];
raise notice 'Got % (in %) instead of ST_LineString. '
raise notice '[%] Got % (in %) instead of ST_LineString. '
'Does the exaggerated bend intersect with the line? '
'If so, try increasing intersect_patience.',
st_geometrytype(lines[i]), dbgname;
gen, st_geometrytype(lines[i]), dbgname;
raise notice 'exiting lineloop, gen:%', gen;
exit lineloop;
end if;