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(somewhat) fix index calculation

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Motiejus Jakštys 2021-05-19 22:57:45 +03:00 committed by Motiejus Jakštys
parent a37385e0d1
commit 06314d77c0
1 changed files with 23 additions and 5 deletions
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28
wm.sql
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@ -166,12 +166,15 @@ create or replace function self_crossing(INOUT bends geometry[]) as $$
declare
i int4;
j int4;
prev_length int4;
pi real;
angle real;
p0 geometry;
p1 geometry;
p2 geometry;
p3 geometry;
a geometry;
b geometry;
s2 real;
s3 real;
bend geometry;
@ -206,7 +209,9 @@ begin
-- cross bends[i]. optimization: we care only about bends which beginning
-- and end start at different sides of the plane, separated by endpoints
-- p0 and p1.
for j in 1..array_length(bends, 1) loop
j = 0;
while j < array_length(bends, 1) loop
j = j + 1;
continue when i = j;
p2 = st_pointn(bends[j], 1);
@ -219,9 +224,11 @@ begin
continue when sign(s2) = sign(s3);
-- do end vertices of bend[i] cross bend[j]?
this = st_makeline(st_pointn(bends[i], 1), st_pointn(bends[i], -1));
multi = st_split(bends[j], this);
a = st_pointn(bends[i], 1);
b = st_pointn(bends[i], -1);
multi = st_split(bends[j], st_makeline(a, b));
continue when st_numgeometries(multi) = 1;
continue when st_numgeometries(multi) = 2 and (st_contains(bends[j], a) or st_contains(bends[j], b));
-- real self-crossing detected! Remove it.
-- if j < i:
@ -229,18 +236,29 @@ begin
-- except the crossing and what comes after it.
-- bends[j] = append(bends[j], bends[i][-1])
-- remove bends from bends[j+1] to bends[i] inclusive.
-- j := i+1
-- elif j > i:
-- bends[i] = bends[i][1]
-- bends[i] = append(bends[i], multi[2][2..n])
-- remove bends from bends[i+1] to bends[j] inclusive.
raise notice 'j: %, i: %', i, j;
raise notice 'bends[i]: %', st_astext(bends[i]);
raise notice 'bends[j]: %', st_astext(bends[j]);
raise notice 'a: %, b: %', st_astext(a), st_astext(b);
raise notice 'multi: %', st_astext(multi);
raise notice '';
prev_length = array_length(bends, 1);
if j < i then
bends[j] = st_geometryn(multi, 1);
bends[j] = st_setpoint(bends[j], st_npoints(bends[j])-1, st_pointn(bends[i], st_npoints(bends[i])));
bends = bends[1:j] || bends[i+1:array_length(bends, 1)];
bends = bends[1:j] || bends[i+1:prev_length];
j = i;
else
--
bends[i] = st_makeline(st_pointn(bends[i], 1), st_removepoint(st_geometryn(multi, 2), 0));
bends = bends[1:i] || bends[j+1:prev_length];
end if;
j = j - prev_length + array_length(bends, 1);
end loop;