split bendattrs to bends and attrs
This commit is contained in:
Motiejus Jakštys
parent
a7cba0755c
commit
7085f8bed3
@ -19,8 +19,7 @@ begin
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st_translate(center, -halfX, -halfY)
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)
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);
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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-- wm_quadrant divides the given geometry to 4 rectangles
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-- and returns the requested quadrant following cartesian
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@ -8,7 +8,7 @@ begin
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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 $$ LANGUAGE plpgsql;
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end $$ language plpgsql;
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drop function if exists dbg_geomsummary;
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create function dbg_geomsummary(geoms geometry[]) returns void as $$
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207
IV/wm.sql
207
IV/wm.sql
@ -89,8 +89,7 @@ begin
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'bbends-polygon', dbgname, dbggen, i, dbgpolygon);
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end loop;
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end if;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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-- wm_fix_gentle_inflections moves bend endpoints following "Gentle Inflection
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-- at End of a Bend" section.
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@ -141,8 +140,7 @@ begin
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'cinflections-polygon', dbgname, dbggen, i, dbgpolygon);
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end loop;
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end if;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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-- wm_fix_gentle_inflections1 fixes gentle inflections of an array of lines in
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-- one direction. An implementation detail of wm_fix_gentle_inflections.
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@ -204,8 +202,7 @@ begin
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end loop;
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end loop;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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-- wm_if_selfcross returns whether baseline of bendi crosses bendj.
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-- If it doesn't, returns a null geometry.
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@ -235,9 +232,7 @@ begin
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end if;
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return multi;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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-- wm_self_crossing eliminates self-crossing from the bends, following the
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-- article's section "Self-line Crossing When Cutting a Bend".
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@ -305,8 +300,7 @@ begin
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unnest(bends)
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);
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end if;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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drop function if exists wm_inflection_angle;
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create function wm_inflection_angle (IN bend geometry, OUT angle real) as $$
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@ -324,17 +318,15 @@ begin
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continue when p3 is null;
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angle = angle + abs(pi() - st_angle(p1, p2, p3));
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end loop;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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drop function if exists wm_bend_attrs;
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drop function if exists wm_isolated_bends;
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drop function if exists wm_elimination;
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drop function if exists wm_exaggeration;
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drop function if exists wm_st_intersects_neighbors;
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drop type if exists wm_t_bend_attrs;
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create type wm_t_bend_attrs as (
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bend geometry,
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drop type if exists wm_t_attrs;
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create type wm_t_attrs as (
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area real,
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adjsize real,
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baselinelength real,
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@ -345,18 +337,17 @@ create function wm_bend_attrs(
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bends geometry[],
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dbgname text default null,
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dbggen integer default null
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) returns setof wm_t_bend_attrs as $$
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) returns setof wm_t_attrs as $$
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declare
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cmp float;
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i int4;
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polygon geometry;
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bend geometry;
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res wm_t_bend_attrs;
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res wm_t_attrs;
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begin
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for i in 1..array_length(bends, 1) loop
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bend = bends[i];
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res = null;
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res.bend = bend;
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res.adjsize = 0;
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res.baselinelength = st_distance(st_startpoint(bend), st_endpoint(bend));
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res.curvature = wm_inflection_angle(bend) / st_length(bend);
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@ -377,8 +368,7 @@ begin
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end if;
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return next res;
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end loop;
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end;
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$$ language plpgsql;
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end $$ language plpgsql;
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-- sm_st_split a line by a point in a more robust way than st_split.
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-- See https://trac.osgeo.org/postgis/ticket/2192
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@ -439,8 +429,7 @@ begin
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));
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bend = st_setsrid(st_makeline(points), st_srid(bend));
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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-- wm_adjsize calculates adjusted size for a polygon. Can return 0.
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drop function if exists wm_adjsize;
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@ -469,7 +458,7 @@ end $$ language plpgsql;
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drop function if exists wm_st_intersects_neighbors;
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create function wm_st_intersects_neighbors(
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bendattrs wm_t_bend_attrs[],
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bends geometry[],
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bend geometry,
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i integer,
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intersect_patience integer
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@ -480,15 +469,15 @@ declare
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begin
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-- Do close-by bends intersect with this one? Special
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-- handling first, because 2 vertices need to be removed before checking.
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n = st_npoints(bendattrs[i-1].bend);
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n = st_npoints(bends[i-1]);
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if n > 3 and st_intersects(bend,
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st_removepoint(st_removepoint(bendattrs[i-1].bend, n-1), n-2)) then
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st_removepoint(st_removepoint(bends[i-1], n-1), n-2)) then
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return true;
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end if;
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n = st_npoints(bendattrs[i+1].bend);
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n = st_npoints(bends[i+1]);
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if n > 3 and st_intersects(bend,
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st_removepoint(st_removepoint(bendattrs[i+1].bend, 0), 0)) then
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st_removepoint(st_removepoint(bends[i+1], 0), 0)) then
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return true;
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end if;
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@ -496,16 +485,16 @@ begin
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-- with any of them. If yes -- abort enlargement.
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for n in -intersect_patience+1..intersect_patience-1 loop
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continue when i+n < 1 or n in (-1, 0, 1);
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continue when i+n > array_length(bendattrs, 1);
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continue when i+n > array_length(bends, 1);
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-- More special handling: if the neigbhoring bend has 3 vertices, the
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-- neighbor's neighbor may just touch the tmpbendattr.bend; in this
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-- neighbor's neighbor may just touch the bend; in this
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-- case, the nearest vertex should be removed before comparing.
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neighbor = bendattrs[i+n].bend;
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neighbor = bends[i+n];
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if st_npoints(neighbor) > 2 then
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if n = -2 and st_npoints(bendattrs[i+n+1].bend) = 3 then
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if n = -2 and st_npoints(bends[i+n+1]) = 3 then
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neighbor = st_removepoint(neighbor, st_npoints(neighbor)-1);
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elsif n = 2 and st_npoints(bendattrs[i+n-1].bend) = 3 then
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elsif n = 2 and st_npoints(bends[i+n-1]) = 3 then
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neighbor = st_removepoint(neighbor, 0);
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end if;
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end if;
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@ -519,7 +508,8 @@ end $$ language plpgsql;
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-- wm_exaggeration is the Exaggeration Operator described in the WM paper.
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create function wm_exaggeration(
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INOUT bendattrs wm_t_bend_attrs[],
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INOUT bends geometry[],
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attrs wm_t_attrs[],
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dhalfcircle float,
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intersect_patience integer,
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dbgname text default null,
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@ -528,64 +518,52 @@ create function wm_exaggeration(
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) as $$
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declare
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desired_size constant float default pi()*(dhalfcircle^2)/8;
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tmpbendattr wm_t_bend_attrs;
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bend geometry;
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neighbor geometry;
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size float;
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i integer;
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n integer;
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this_mutated boolean;
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begin
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mutated = false;
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<<bendloop>>
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for i in 1..array_length(bendattrs, 1) loop
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continue when not bendattrs[i].isolated;
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size = bendattrs[i].adjsize;
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for i in 1..array_length(attrs, 1) loop
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continue when not attrs[i].isolated;
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size = attrs[i].adjsize;
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this_mutated = false;
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-- keep increasing this bend until either size permits, or it hits a
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-- neighboring bend (intersect_patience number of neighbors will be
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-- checked). When the size is right, stick it to the line.
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while size < desired_size loop
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tmpbendattr.bend = wm_exaggerate_bend(bendattrs[i].bend);
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exit when wm_st_intersects_neighbors(
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bendattrs,
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tmpbendattr.bend,
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i,
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intersect_patience
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);
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bend = wm_exaggerate_bend(bends[i]);
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exit when wm_st_intersects_neighbors(bends, bend, i, intersect_patience);
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this_mutated = true;
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bendattrs[i] = tmpbendattr;
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size = wm_adjsize(bendattrs[i].bend);
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bends[i] = bend;
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size = wm_adjsize(bends[i]);
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end loop;
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continue when not this_mutated;
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mutated = true;
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-- Stick the right-sized bend to the line
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-----------------------------------------
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-- Remove last vertex of the previous bend and first vertex of the next
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-- bend, because bends always share a line segment together this is
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-- duplicated in a few places, because PostGIS does not allow (?)
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-- mutating an array when passed to a function.
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tmpbendattr.bend = st_removepoint(
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bendattrs[i-1].bend,
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st_npoints(bendattrs[i-1].bend)-1
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);
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bendattrs[i-1] = tmpbendattr;
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tmpbendattr.bend = st_removepoint(bendattrs[i+1].bend, 0);
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bendattrs[i+1] = tmpbendattr;
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-- bend, because bends always share a line segment together.
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bend = st_removepoint(bends[i-1], st_npoints(bends[i-1])-1);
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bends[i-1] = bend;
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bend = st_removepoint(bends[i+1], 0);
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bends[i+1] = bend;
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if dbgname is not null then
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insert into wm_debug (stage, name, gen, nbend, way) values(
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'gexaggeration', dbgname, dbggen, i, bendattrs[i].bend
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);
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'gexaggeration', dbgname, dbggen, i, bends[i]);
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end if;
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end loop;
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end $$ language plpgsql;
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create function wm_elimination(
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INOUT bendattrs wm_t_bend_attrs[],
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INOUT bends geometry[],
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attrs wm_t_attrs[],
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dhalfcircle float,
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dbgname text default null,
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dbggen integer default null,
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@ -596,73 +574,59 @@ declare
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leftsize float;
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rightsize float;
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i int4;
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j int4;
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tmpbendattr wm_t_bend_attrs;
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dbgbends geometry[];
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bend geometry;
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begin
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mutated = false;
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i = 1;
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while i < array_length(bendattrs, 1)-1 loop
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while i < array_length(attrs, 1)-1 loop
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i = i + 1;
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continue when bendattrs[i].adjsize = 0;
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continue when bendattrs[i].adjsize > desired_size;
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continue when attrs[i].adjsize = 0;
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continue when attrs[i].adjsize > desired_size;
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if i = 2 then
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leftsize = bendattrs[i].adjsize + 1;
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leftsize = attrs[i].adjsize + 1;
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else
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leftsize = bendattrs[i-1].adjsize;
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leftsize = attrs[i-1].adjsize;
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end if;
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if i = array_length(bendattrs, 1)-1 then
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rightsize = bendattrs[i].adjsize + 1;
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if i = array_length(attrs, 1)-1 then
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rightsize = attrs[i].adjsize + 1;
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else
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rightsize = bendattrs[i+1].adjsize;
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rightsize = attrs[i+1].adjsize;
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end if;
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continue when bendattrs[i].adjsize >= leftsize;
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continue when bendattrs[i].adjsize >= rightsize;
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continue when attrs[i].adjsize >= leftsize;
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continue when attrs[i].adjsize >= rightsize;
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-- Local minimum. Elminate bend!
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mutated = true;
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tmpbendattr.bend = st_makeline(
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st_pointn(bendattrs[i].bend, 1),
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st_pointn(bendattrs[i].bend, -1)
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);
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bendattrs[i] = tmpbendattr;
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bends[i] = st_makeline(st_pointn(bends[i], 1), st_pointn(bends[i], -1));
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-- remove last vertex of the previous bend and
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-- first vertex of the next bend, because bends always
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-- share a line segment together
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tmpbendattr.bend = st_removepoint(
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bendattrs[i-1].bend,
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st_npoints(bendattrs[i-1].bend)-1
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);
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bendattrs[i-1] = tmpbendattr;
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tmpbendattr.bend = st_removepoint(bendattrs[i+1].bend, 0);
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bendattrs[i+1] = tmpbendattr;
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bends[i-1] = st_removepoint(bends[i-1], st_npoints(bends[i-1])-1);
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bends[i+1] = st_removepoint(bends[i+1], 0);
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-- the next bend's adjsize is now messed up; it should not be taken
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-- into consideration for other local minimas. Skip over 2.
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i = i + 2;
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end loop;
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if dbgname is not null then
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for j in 1..array_length(bendattrs, 1) loop
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dbgbends[j] = bendattrs[j].bend;
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end loop;
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insert into wm_debug(stage, name, gen, nbend, way) values(
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'helimination',
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dbgname,
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dbggen,
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generate_subscripts(dbgbends, 1),
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unnest(dbgbends)
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generate_subscripts(bends, 1),
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unnest(bends)
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);
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end if;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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create function wm_isolated_bends(
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INOUT bendattrs wm_t_bend_attrs[],
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INOUT attrs wm_t_attrs[],
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bends geometry[],
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dbgname text default null,
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dbggen integer default null
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) as $$
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@ -671,31 +635,31 @@ declare
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isolation_threshold constant real default 0.5;
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this real;
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skip_next bool;
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res wm_t_bend_attrs;
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res wm_t_attrs;
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i int4;
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last_id integer;
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begin
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for i in 1..array_length(bendattrs, 1) loop
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for i in 1..array_length(attrs, 1) loop
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if dbgname is not null then
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insert into wm_debug (stage, name, gen, nbend, way, props) values(
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'fisolated_bends', dbgname, dbggen, i, bendattrs[i].bend,
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'fisolated_bends', dbgname, dbggen, i, bends[i],
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jsonb_build_object('isolated', false)
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) returning id into last_id;
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end if;
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-- first and last bends cannot be isolated
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if i = 1 or i = array_length(bendattrs, 1) then
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if i = 1 or i = array_length(attrs, 1) then
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continue;
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end if;
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res = bendattrs[i];
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res = attrs[i];
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if skip_next then
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skip_next = false;
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else
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this = bendattrs[i].curvature * isolation_threshold;
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if bendattrs[i-1].curvature < this and
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bendattrs[i+1].curvature < this then
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this = attrs[i].curvature * isolation_threshold;
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if attrs[i-1].curvature < this and
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attrs[i+1].curvature < this then
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res.isolated = true;
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bendattrs[i] = res;
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attrs[i] = res;
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skip_next = true;
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if dbgname is not null then
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@ -707,8 +671,7 @@ begin
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end if;
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end loop;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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drop function if exists ST_SimplifyWM_Estimate;
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create function ST_SimplifyWM_Estimate(
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@ -734,8 +697,7 @@ begin
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npoints = npoints + st_numpoints(lines[i]);
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end loop;
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secs = npoints / 33;
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end
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$$ language plpgsql;
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end $$ language plpgsql;
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-- ST_SimplifyWM simplifies a given geometry using Wang & Müller's
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-- "Line Generalization Based on Analysis of Shape Characteristics" algorithm,
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@ -759,7 +721,7 @@ declare
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line geometry;
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lines geometry[];
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bends geometry[];
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bendattrs wm_t_bend_attrs[];
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attrs wm_t_attrs[];
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mutated boolean;
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l_type text;
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begin
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@ -790,31 +752,25 @@ begin
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select * from wm_self_crossing(bends, dbgname, gen) into bends, mutated;
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if mutated then
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lines[i] = st_linemerge(st_union(bends));
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gen = gen + 1;
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continue;
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end if;
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bendattrs = array((select wm_bend_attrs(bends, dbgname, gen)));
|
||||
bendattrs = wm_isolated_bends(bendattrs, dbgname, gen);
|
||||
if not mutated then
|
||||
attrs = array((select wm_bend_attrs(bends, dbgname, gen)));
|
||||
attrs = wm_isolated_bends(attrs, bends, dbgname, gen);
|
||||
|
||||
select * from wm_exaggeration(
|
||||
bendattrs, dhalfcircle, intersect_patience, dbgname, gen
|
||||
) into bendattrs, mutated;
|
||||
bends, attrs, dhalfcircle, intersect_patience, dbgname, gen
|
||||
) into bends, mutated;
|
||||
end if;
|
||||
|
||||
-- TODO: wm_combination
|
||||
|
||||
if not mutated then
|
||||
select * from wm_elimination(
|
||||
bendattrs, dhalfcircle, dbgname, gen) into bendattrs, mutated;
|
||||
bends, attrs, dhalfcircle, dbgname, gen) into bends, mutated;
|
||||
end if;
|
||||
|
||||
if mutated then
|
||||
for j in 1..array_length(bendattrs, 1) loop
|
||||
bends[j] = bendattrs[j].bend;
|
||||
end loop;
|
||||
lines[i] = st_linemerge(st_union(bends));
|
||||
|
||||
if st_geometrytype(lines[i]) != 'ST_LineString' then
|
||||
-- For manual debugging, usually when wm_exaggeration returns
|
||||
-- ST_MultiLineString. Uncomment the code below and `raise notice`.
|
||||
@ -839,5 +795,4 @@ begin
|
||||
elseif l_type = 'ST_MultiLineString' then
|
||||
return st_union(lines);
|
||||
end if;
|
||||
end
|
||||
$$ language plpgsql;
|
||||
end $$ language plpgsql;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user