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wip start wm_exaggeration

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Motiejus Jakštys 2021-05-04 17:16:01 +03:00
parent edf2989857
commit 534a9b9814
1 changed files with 26 additions and 12 deletions
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38
IV/wm.sql
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@ -10,7 +10,6 @@ create function wm_detect_bends(
OUT bends geometry[]
) as $$
declare
pi constant real default radians(180);
p geometry;
p1 geometry;
p2 geometry;
@ -52,7 +51,7 @@ begin
p1 = p;
continue when p3 is null;
cur_sign = sign(pi - st_angle(p1, p2, p2, p3));
cur_sign = sign(pi() - st_angle(p1, p2, p2, p3));
if bend is null then
bend = st_makeline(p3, p2);
@ -170,7 +169,6 @@ $$ language plpgsql;
drop function if exists wm_fix_gentle_inflections1;
create function wm_fix_gentle_inflections1(INOUT bends geometry[]) as $$
declare
pi constant real default radians(180);
-- the threshold when the angle is still "small", so gentle inflections can
-- be joined
small_angle constant real default radians(45);
@ -214,7 +212,7 @@ begin
exit when array_length(phead, 1) < 3;
-- inflection angle between ptail[1:3] is "large", stop processing
exit when abs(st_angle(phead[1], phead[2], phead[3]) - pi) > small_angle;
exit when abs(st_angle(phead[1], phead[2], phead[3]) - pi()) > small_angle;
-- distance from head's 1st vertex should be larger than from 2nd vertex
exit when st_distance(ptail, phead[2]) < st_distance(ptail, phead[3]);
@ -271,7 +269,6 @@ create function wm_self_crossing(
OUT mutated boolean
) as $$
declare
pi constant real default radians(180);
i int4;
j int4;
multi geometry;
@ -279,7 +276,7 @@ begin
mutated = false;
<<bendloop>>
for i in 1..array_length(bends, 1) loop
continue when abs(wm_inflection_angle(bends[i])) <= pi;
continue when abs(wm_inflection_angle(bends[i])) <= pi();
-- sum of inflection angles for this bend is >180, so it may be
-- self-crossing. Now try to find another bend in this line that
-- crosses an imaginary line of end-vertices
@ -337,7 +334,6 @@ $$ language plpgsql;
drop function if exists wm_inflection_angle;
create function wm_inflection_angle (IN bend geometry, OUT angle real) as $$
declare
pi constant real default radians(180);
p0 geometry;
p1 geometry;
p2 geometry;
@ -349,7 +345,7 @@ begin
p2 = p1;
p1 = p0;
continue when p3 is null;
angle = angle + abs(pi - st_angle(p1, p2, p3));
angle = angle + abs(pi() - st_angle(p1, p2, p3));
end loop;
end
$$ language plpgsql;
@ -357,6 +353,7 @@ $$ language plpgsql;
drop function if exists wm_bend_attrs;
drop function if exists wm_isolated_bends;
drop function if exists wm_elimination;
drop function if exists wm_exaggeration;
drop type if exists wm_t_bend_attrs;
create type wm_t_bend_attrs as (
bend geometry,
@ -427,6 +424,20 @@ begin
end;
$$ language plpgsql;
create function wm_exaggeration(
INOUT bendattrs wm_t_bend_attrs[],
dhalfcircle float,
dbgname text default null,
dbggen integer default null,
OUT mutated boolean
) as $$
declare
area_threshold float;
begin
end
$$ language plpgsql;
create function wm_elimination(
INOUT bendattrs wm_t_bend_attrs[],
dhalfcircle float,
@ -637,6 +648,13 @@ begin
bendattrs = array((select wm_bend_attrs(bends, dbgname, gen)));
-- code to detect isolated bends is there, but bend exaggeration
-- is not implemented.
perform wm_isolated_bends(bendattrs, dbgname, gen);
select * from wm_exaggeration(
bendattrs, dhalfcircle, dbgname, gen) into bendattrs, mutated;
select * from wm_elimination(
bendattrs, dhalfcircle, dbgname, gen) into bendattrs, mutated;
if mutated then
@ -647,10 +665,6 @@ begin
gen = gen + 1;
continue;
end if;
-- code to detect isolated bends is there, but bend exaggeration
-- is not implemented.
--perform wm_isolated_bends(bendattrs, dbgname, gen);
end loop;
end loop;