wm/tests-rivers.sql

51 lines
1.4 KiB
PL/PgSQL

\i wm.sql
-- wm_envelope clips a geometry by a bounding box around a given object,
-- matching dimensions of A-class paper (1 by sqrt(2).
drop function if exists wm_bbox;
create function wm_bbox(
center geometry,
scaledwidth float
) returns geometry as $$
declare
halfX float;
halfY float;
begin
halfX = scaledwidth / 2;
halfY = halfX * sqrt(2);
return st_envelope(
st_union(
st_translate(center, halfX, halfY),
st_translate(center, -halfX, -halfY)
)
);
end
$$ language plpgsql;
insert into wm_visuals(name, way) values('salvis', (
select st_intersection(
(select st_union(way) from wm_rivers where name in ('Šalčia', 'Visinčia')),
wm_bbox(
st_closestpoint(
(select way from wm_rivers where name='Šalčia'),
(select way from wm_rivers where name='Visinčia')
),
:scaledwidth
)
)
));
do $$
declare
npoints bigint;
secs bigint;
begin
select * from ST_SimplifyWM_Estimate((select st_union(way) from wm_rivers)) into npoints, secs;
raise notice 'Total points: %', npoints;
raise notice 'Expected duration: %s (+-%s)', ceil(secs), floor(secs*.5);
end $$ language plpgsql;
delete from wm_debug where name in (select distinct name from wm_rivers);
delete from wm_demo where name in (select distinct name from wm_rivers);
insert into wm_demo (name, way) select name, ST_SimplifyWM(way, name) from wm_rivers;