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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 some
platforms.  I plan to update the test later today.
This commit is contained in:
Tom Lane 2002-11-08 18:32:47 +00:00
parent cea5388840
commit c2b716ab68
1 changed files with 10 additions and 5 deletions
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15
src/backend/utils/adt/geo_ops.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/geo_ops.c,v 1.67 2002/11/08 17:37:52 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/geo_ops.c,v 1.68 2002/11/08 18:32:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -22,10 +22,12 @@
#include "utils/builtins.h"
#include "utils/geo_decls.h"
#ifndef PI
#define PI 3.1415926536
#ifndef M_PI
/* from my RH5.2 gcc math.h file - thomas 2000-04-03 */
#define M_PI 3.14159265358979323846
#endif
/*
* Internal routines
*/
@ -4365,7 +4367,7 @@ circle_center(PG_FUNCTION_ARGS)
static double
circle_ar(CIRCLE *circle)
{
return PI * (circle->radius * circle->radius);
return M_PI * (circle->radius * circle->radius);
}
@ -4438,6 +4440,7 @@ circle_poly(PG_FUNCTION_ARGS)
size;
int i;
double angle;
double anglestep;
if (FPzero(circle->radius) || (npts < 2))
elog(ERROR, "Unable to convert circle to polygon");
@ -4455,9 +4458,11 @@ circle_poly(PG_FUNCTION_ARGS)
poly->size = size;
poly->npts = npts;
anglestep = (2.0 * M_PI) / npts;
for (i = 0; i < npts; i++)
{
angle = i * (2 * PI / npts);
angle = i * anglestep;
poly->p[i].x = circle->center.x - (circle->radius * cos(angle));
poly->p[i].y = circle->center.y + (circle->radius * sin(angle));
}