From f42354800b2f3258cd8ce73b0b44600f1abc0d84 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Motiejus=20Jak=C5=A1tys?= Date: Sat, 20 Feb 2021 14:30:40 +0200 Subject: [PATCH] 80 chars --- IV/wm.sql | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/IV/wm.sql b/IV/wm.sql index a3e773d..1bea587 100644 --- a/IV/wm.sql +++ b/IV/wm.sql @@ -21,22 +21,22 @@ begin -- -- Given 3 vertices p1, p2, p3: -- - -- p1___ ... - -- / - -- ..._____/ - -- p3 p2 + -- p1___ ... + -- / + -- ... _____/ + -- p3 p2 -- - -- This loop will use p1 as the head vertex, p2 will be the measured angle, - -- and p3 will be trailing. The line that will be added to the bend will - -- always be [p3,p2]. + -- When looping over the line, p1 will be head (lead) vertex, p2 will be the + -- measured angle, and p3 will be trailing. The line that will be added to + -- the bend will always be [p3,p2]. -- So once the p1 becomes the last vertex, the loop terminates, and the -- [p2,p1] line will not have a chance to be added. So the loop adds the last -- vertex twice, so it has a chance to become p2, and be added to the bend. -- for p in ( - (select (dp).geom from st_dumppoints(line) as dp order by (dp).path[1] asc) + (select geom from st_dumppoints(line) order by path[1] asc) union all - (select (dp).geom from st_dumppoints(line) as dp order by (dp).path[1] desc limit 1) + (select geom from st_dumppoints(line) order by path[1] desc limit 1) ) loop p3 = p2; p2 = p1; @@ -61,8 +61,8 @@ begin prev_sign = cur_sign; end loop; - -- the last bend may be lost if there is no "final" inflection angle. Add it. - if (select count(1) from ((select st_dumppoints(bend) as a)) b) >= 2 then + -- the last line may be lost if there is no "final" inflection angle. Add it. + if (select count(1) >= 2 from st_dumppoints(bend)) then bends = bends || bend; end if; end