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more visual inflection-1

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Motiejus Jakštys 2021-04-12 14:02:19 +03:00
parent 0ee4868059
commit 3782c84e87
2 changed files with 5 additions and 4 deletions
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3
IV/mj-msc.tex
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@ -312,7 +312,8 @@ and the distance is decreasing, the algorithm should keep going; practically
not having an upper bound on the number of iterations.
Additional example, not found in the original paper, is illustrated in
figure~\onpage{fig:inflection-1-gentle-inflection}: it moves a few vertices.
figure~\ref{fig:inflection-1-gentle-inflection}, which moves two vertices
instead of one.
\begin{figure}[h]
\centering

6
IV/tests.sql
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@ -44,7 +44,7 @@ insert into wm_figures (name, way) values ('fig6-combi',
)
);
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 5,123 7,114 7,111 2)'));
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
@ -82,8 +82,8 @@ begin
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 5,123 7,114 7)', st_astext(vinflections[2]));
perform assert_equals('LINESTRING(123 7,114 7,111 2)', st_astext(vinflections[3]));
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 $$ language plpgsql;
do $$