122 lines
6.2 KiB
PL/PgSQL
122 lines
6.2 KiB
PL/PgSQL
\i wm.sql
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-- https://stackoverflow.com/questions/19982373/which-tools-libraries-do-you-use-to-unit-test-your-pl-pgsql
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CREATE OR REPLACE FUNCTION assert_equals(expected anyelement, actual anyelement) RETURNS void AS $$
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begin
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if expected = actual or (expected is null and actual is null) then
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--do nothing
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else
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raise exception 'Assertion Error. Expected <%> but was <%>', expected, actual;
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end if;
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end $$ LANGUAGE plpgsql;
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drop function if exists dbg_geomsummary;
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create function dbg_geomsummary(geoms geometry[], OUT output text) as $$
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declare i int4;
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begin
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output = format('len: %s;', array_length(geoms, 1));
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for i in 1..array_length(geoms, 1) loop
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output = output || format(' %s:%s;', i, st_astext(geoms[i]));
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end loop;
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end
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$$ language plpgsql;
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-- to preview this somewhat conveniently in QGIS:
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-- stage || '_' || name || ' gen:' || coalesce(gen, 'Ø') || ' nbend:' || lpad(nbend, 4, '0')
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drop table if exists wm_debug;
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create table wm_debug(stage text, name text, gen bigint, nbend bigint, way geometry, props jsonb);
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drop table if exists wm_figures;
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create table wm_figures (name text, way geometry);
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-- add fig8.gpkg to postgis:
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-- ogr2ogr -update -f PostgreSQL PG:"host=127.0.0.1 user=osm password=osm dbname=osm" fig8.gpkg
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-- to "normalize" a new line when it's in `f`:
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-- select st_astext(st_snaptogrid(st_transscale(geometry, -19.5, .016, 4000, 4000), 1)) from f;
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insert into wm_figures (name, way) values ('fig3',ST_GeomFromText('LINESTRING(0 0,12 0,13 4,20 2,20 0,32 0,33 10,38 16,43 15,44 10,44 0,60 0)'));
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insert into wm_figures (name, way) values ('fig3-1',ST_GeomFromText('LINESTRING(0 0,12 0,13 4,20 2,20 0,32 0,33 10,38 16,43 15,44 10,44 0)'));
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insert into wm_figures (name, way) values ('fig5',ST_GeomFromText('LINESTRING(0 39,19 52,27 77,26 104,41 115,49 115,65 103,65 75,53 45,63 15,91 0)'));
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insert into wm_figures (name, way) values ('fig6',ST_GeomFromText('LINESTRING(84 47,91 59,114 64,122 80,116 92,110 93,106 106,117 118,136 107,135 76,120 45,125 39,141 39,147 32)'));
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insert into wm_figures (name, way) values ('fig6-rev',ST_Reverse(ST_Translate((select way from wm_figures where name='fig6'), 60, 0)));
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insert into wm_figures (name, way) values ('fig6-combi',
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ST_Union(
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ST_Translate((select way from wm_figures where name='fig6'), 0, 90),
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ST_Translate((select way from wm_figures where name='fig6'), 80, 90)
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)
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);
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insert into wm_figures (name, way) values('fig8', ST_GeomFromText('LINESTRING(173 12,174 10,180 8,186 8,186 13,191 11,189 6,201 5,203 11,216 16,216 6,222 7,229 3,236 2,239 6,243 8,248 6)'));
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insert into wm_figures (name, way) values ('inflection-1',ST_GeomFromText('LINESTRING(110 24,114 20,133 20,145 15,145 0,136 8,123 10,114 10,111 2)'));
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insert into wm_figures (name, way) values ('multi-island',ST_GeomFromText('MULTILINESTRING((-15 10,-10 10,-5 11,0 11,5 11,10 10,11 9,13 10,15 9),(-5 11,-2 15,0 16,2 15,5 11))'));
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-- Run ST_SimplifyWM in debug mode, so `wm_debug` is populated. That table
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-- is used for geometric assertions later in the file.
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drop table if exists wm_demo;
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create table wm_demo (name text, i bigint, way geometry);
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insert into wm_demo (name, way) select name, ST_SimplifyWM(way, name) from wm_figures;
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do $$
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declare
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vbends geometry[];
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begin
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select array((select way from wm_debug where name='fig3' and stage='bbends')) into vbends;
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perform assert_equals(5, array_length(vbends, 1));
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perform assert_equals('LINESTRING(0 0,12 0,13 4)', st_astext(vbends[1]));
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perform assert_equals('LINESTRING(12 0,13 4,20 2,20 0)', st_astext(vbends[2]));
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perform assert_equals('LINESTRING(20 2,20 0,32 0,33 10)', st_astext(vbends[3]));
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perform assert_equals('LINESTRING(32 0,33 10,38 16,43 15,44 10,44 0)', st_astext(vbends[4]));
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perform assert_equals(4, array_length(detect_bends((select way from wm_figures where name='fig3-1')), 1));
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select detect_bends((select way from wm_figures where name='fig5')) into vbends;
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perform assert_equals(3, array_length(vbends, 1));
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end $$ language plpgsql;
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do $$
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declare
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vbends geometry[];
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vinflections geometry[];
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begin
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select array((select way from wm_debug where name='fig5' and stage='cinflections')) into vinflections;
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perform assert_equals('LINESTRING(0 39,19 52,27 77)', st_astext(vinflections[1]));
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perform assert_equals('LINESTRING(19 52,27 77,26 104,41 115,49 115,65 103,65 75,53 45)', st_astext(vinflections[2]));
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perform assert_equals('LINESTRING(65 75,53 45,63 15,91 0)', st_astext(vinflections[3]));
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-- inflections-1, the example in fix_gentle_inflections docstring
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select array((select way from wm_debug where name='inflection-1' and stage='bbends')) into vbends;
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select array((select way from wm_debug where name='inflection-1' and stage='cinflections')) into vinflections;
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perform assert_equals(vbends[1], vinflections[1]); -- unchanged
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perform assert_equals('LINESTRING(114 20,133 20,145 15,145 0,136 8,123 10,114 10)', st_astext(vinflections[2]));
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perform assert_equals('LINESTRING(123 10,114 10,111 2)', st_astext(vinflections[3]));
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end $$ language plpgsql;
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do $$
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declare
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vcrossings geometry[];
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mutated boolean;
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begin
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select (self_crossing(array((select way from wm_debug where stage='cinflections' and name='fig6')))).* into vcrossings, mutated;
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perform assert_equals(true, mutated);
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perform assert_equals(
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'LINESTRING(84 47,91 59,114 64,120 45,125 39,141 39,147 32)',
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(select st_astext(
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st_linemerge(st_union(way))
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) from (select unnest(vcrossings) way) a)
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);
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select (self_crossing(array((select way from wm_debug where stage='cinflections' and name='fig6-rev')))).* into vcrossings, mutated;
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perform assert_equals(true, mutated);
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perform assert_equals(
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'LINESTRING(84 47,91 59,114 64,120 45,125 39,141 39,147 32)',
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(select st_astext(
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st_translate(st_reverse(st_linemerge(st_union(way))), -60, 0)
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) from (select unnest(vcrossings) way) a)
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);
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select (self_crossing(array((select way from wm_debug where stage='cinflections' and name='fig6-combi' and gen=1)))).* into vcrossings, mutated;
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perform assert_equals(true, mutated);
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perform assert_equals(
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'MULTILINESTRING((84 137,91 149,114 154,120 135,125 129,141 129,147 122),(164 137,171 149,194 154,200 135,205 129,221 129,227 122))',
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(select st_astext(
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st_linemerge(st_union(way))
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) from (select unnest(vcrossings) way) a)
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);
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end $$ language plpgsql;
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