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Commitc2b716a

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Replace imprecise value of PI with a better one, and tweak circle_poly
in hopes of reducing platform-to-platform variations in its results.This will cause the geometry regression test to start failing on someplatforms. I plan to update the test later today.
1 parentcea5388 commitc2b716a

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1 file changed

+10
-5
lines changed

1 file changed

+10
-5
lines changed

‎src/backend/utils/adt/geo_ops.c

Lines changed: 10 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/utils/adt/geo_ops.c,v 1.67 2002/11/0817:37:52 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/geo_ops.c,v 1.68 2002/11/0818:32:47 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -22,10 +22,12 @@
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#include"utils/builtins.h"
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#include"utils/geo_decls.h"
2424

25-
#ifndefPI
26-
#definePI 3.1415926536
25+
#ifndefM_PI
26+
/* from my RH5.2 gcc math.h file - thomas 2000-04-03 */
27+
#defineM_PI 3.14159265358979323846
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#endif
2829

30+
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/*
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* Internal routines
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*/
@@ -4365,7 +4367,7 @@ circle_center(PG_FUNCTION_ARGS)
43654367
staticdouble
43664368
circle_ar(CIRCLE*circle)
43674369
{
4368-
returnPI* (circle->radius*circle->radius);
4370+
returnM_PI* (circle->radius*circle->radius);
43694371
}
43704372

43714373

@@ -4438,6 +4440,7 @@ circle_poly(PG_FUNCTION_ARGS)
44384440
size;
44394441
inti;
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doubleangle;
4443+
doubleanglestep;
44414444

44424445
if (FPzero(circle->radius)|| (npts<2))
44434446
elog(ERROR,"Unable to convert circle to polygon");
@@ -4455,9 +4458,11 @@ circle_poly(PG_FUNCTION_ARGS)
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poly->size=size;
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poly->npts=npts;
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4461+
anglestep= (2.0*M_PI) /npts;
4462+
44584463
for (i=0;i<npts;i++)
44594464
{
4460-
angle=i*(2*PI /npts);
4465+
angle=i*anglestep;
44614466
poly->p[i].x=circle->center.x- (circle->radius*cos(angle));
44624467
poly->p[i].y=circle->center.y+ (circle->radius*sin(angle));
44634468
}

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