\i wm.sql -- https://stackoverflow.com/questions/19982373/which-tools-libraries-do-you-use-to-unit-test-your-pl-pgsql CREATE OR REPLACE FUNCTION assert_equals(expected anyelement, actual anyelement) RETURNS void AS $$ begin if expected = actual or (expected is null and actual is null) then --do nothing else raise exception 'Assertion Error. Expected <%> but was <%>', expected, actual; end if; end $$ LANGUAGE plpgsql; drop function if exists dbg_geomsummary; create function dbg_geomsummary(geoms geometry[], OUT output text) as $$ declare i int4; begin output = format('len: %s;', array_length(geoms, 1)); for i in 1..array_length(geoms, 1) loop output = output || format(' %s:%s;', i, st_astext(geoms[i])); end loop; end $$ language plpgsql; -- to preview this somewhat conveniently in QGIS: -- stage || '_' || name || ' gen:' || coalesce(gen, 'Ø') || ' nbend:' || lpad(nbend, 4, '0') drop table if exists wm_debug; create table wm_debug(stage text, name text, gen bigint, nbend bigint, way geometry, props jsonb); drop table if exists wm_figures; create table wm_figures (name text, way geometry); -- add fig8.gpkg to postgis: -- ogr2ogr -update -f PostgreSQL PG:"host=127.0.0.1 user=osm password=osm dbname=osm" fig8.gpkg -- to "normalize" a new line when it's in `f`: -- select st_astext(st_snaptogrid(st_transscale(geometry, -19.5, .016, 4000, 4000), 1)) from f; 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)')); 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)')); 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)')); 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)')); insert into wm_figures (name, way) values ('fig6-rev',ST_Reverse(ST_Translate((select way from wm_figures where name='fig6'), 60, 0))); insert into wm_figures (name, way) values ('fig6-combi', ST_Union( ST_Translate((select way from wm_figures where name='fig6'), 0, 90), ST_Translate((select way from wm_figures where name='fig6'), 80, 90) ) ); 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)')); 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)')); 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))')); -- Run ST_SimplifyWM in debug mode, so `wm_debug` is populated. That table -- is used for geometric assertions later in the file. drop table if exists wm_demo; create table wm_demo (name text, i bigint, way geometry); insert into wm_demo (name, way) select name, ST_SimplifyWM(way, name) from wm_figures; -- wm_visuals holds visual aids for the paper. drop table if exists wm_visuals; create table wm_visuals (name text, way geometry); do $$ declare fig6b1 geometry; declare fig6b2 geometry; begin select way from wm_debug where name='fig6' and stage='bbends' and gen=1 into fig6b1 limit 1 offset 0; select way from wm_debug where name='fig6' and stage='bbends' and gen=1 into fig6b2 limit 1 offset 2; insert into wm_visuals (name, way) values('fig6-baseline', st_makeline(st_startpoint(fig6b2), st_endpoint(fig6b2))); insert into wm_visuals (name, way) values('fig6-newline', st_makeline(st_endpoint(fig6b1), st_endpoint(fig6b2))); end $$ language plpgsql; do $$ declare vbends geometry[]; begin select array((select way from wm_debug where name='fig3' and stage='bbends')) into vbends; perform assert_equals(5, array_length(vbends, 1)); perform assert_equals('LINESTRING(0 0,12 0,13 4)', st_astext(vbends[1])); perform assert_equals('LINESTRING(12 0,13 4,20 2,20 0)', st_astext(vbends[2])); perform assert_equals('LINESTRING(20 2,20 0,32 0,33 10)', st_astext(vbends[3])); perform assert_equals('LINESTRING(32 0,33 10,38 16,43 15,44 10,44 0)', st_astext(vbends[4])); perform assert_equals(4, array_length(detect_bends((select way from wm_figures where name='fig3-1')), 1)); select detect_bends((select way from wm_figures where name='fig5')) into vbends; perform assert_equals(3, array_length(vbends, 1)); end $$ language plpgsql; do $$ declare vbends geometry[]; vinflections geometry[]; begin select array((select way from wm_debug where name='fig5' and stage='cinflections')) into vinflections; perform assert_equals('LINESTRING(0 39,19 52,27 77)', st_astext(vinflections[1])); perform assert_equals('LINESTRING(19 52,27 77,26 104,41 115,49 115,65 103,65 75,53 45)', st_astext(vinflections[2])); perform assert_equals('LINESTRING(65 75,53 45,63 15,91 0)', st_astext(vinflections[3])); -- inflections-1, the example in fix_gentle_inflections docstring select array((select way from wm_debug where name='inflection-1' and stage='bbends')) into vbends; select array((select way from wm_debug where name='inflection-1' and stage='cinflections')) into vinflections; perform assert_equals(vbends[1], vinflections[1]); -- unchanged perform assert_equals('LINESTRING(114 20,133 20,145 15,145 0,136 8,123 10,114 10)', st_astext(vinflections[2])); perform assert_equals('LINESTRING(123 10,114 10,111 2)', st_astext(vinflections[3])); end $$ language plpgsql; do $$ declare vcrossings geometry[]; mutated boolean; begin select (self_crossing(array((select way from wm_debug where stage='cinflections' and name='fig6')))).* into vcrossings, mutated; perform assert_equals(true, mutated); perform assert_equals( 'LINESTRING(84 47,91 59,114 64,120 45,125 39,141 39,147 32)', (select st_astext( st_linemerge(st_union(way)) ) from (select unnest(vcrossings) way) a) ); select (self_crossing(array((select way from wm_debug where stage='cinflections' and name='fig6-rev')))).* into vcrossings, mutated; perform assert_equals(true, mutated); perform assert_equals( 'LINESTRING(84 47,91 59,114 64,120 45,125 39,141 39,147 32)', (select st_astext( st_translate(st_reverse(st_linemerge(st_union(way))), -60, 0) ) from (select unnest(vcrossings) way) a) ); select (self_crossing(array((select way from wm_debug where stage='cinflections' and name='fig6-combi' and gen=1)))).* into vcrossings, mutated; perform assert_equals(true, mutated); perform assert_equals( 'MULTILINESTRING((84 137,91 149,114 154,120 135,125 129,141 129,147 122),(164 137,171 149,194 154,200 135,205 129,221 129,227 122))', (select st_astext( st_linemerge(st_union(way)) ) from (select unnest(vcrossings) way) a) ); end $$ language plpgsql;