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382ceffdf7
Don't move parenthesized lines to the left, even if that means they flow past the right margin. By default, BSD indent lines up statement continuation lines that are within parentheses so that they start just to the right of the preceding left parenthesis. However, traditionally, if that resulted in the continuation line extending to the right of the desired right margin, then indent would push it left just far enough to not overrun the margin, if it could do so without making the continuation line start to the left of the current statement indent. That makes for a weird mix of indentations unless one has been completely rigid about never violating the 80-column limit. This behavior has been pretty universally panned by Postgres developers. Hence, disable it with indent's new -lpl switch, so that parenthesized lines are always lined up with the preceding left paren. This patch is much less interesting than the first round of indent changes, but also bulkier, so I thought it best to separate the effects. Discussion: https://postgr.es/m/E1dAmxK-0006EE-1r@gemulon.postgresql.org Discussion: https://postgr.es/m/30527.1495162840@sss.pgh.pa.us
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
/* contrib/earthdistance/earthdistance.c */
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#include "postgres.h"
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#include <math.h>
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#include "utils/geo_decls.h" /* for Point */
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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PG_MODULE_MAGIC;
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/* Earth's radius is in statute miles. */
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static const double EARTH_RADIUS = 3958.747716;
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static const double TWO_PI = 2.0 * M_PI;
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/******************************************************
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*
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* degtorad - convert degrees to radians
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*
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* arg: double, angle in degrees
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*
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* returns: double, same angle in radians
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******************************************************/
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static double
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degtorad(double degrees)
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{
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return (degrees / 360.0) * TWO_PI;
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}
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/******************************************************
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*
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* geo_distance_internal - distance between points
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*
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* args:
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* a pair of points - for each point,
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* x-coordinate is longitude in degrees west of Greenwich
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* y-coordinate is latitude in degrees above equator
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*
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* returns: double
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* distance between the points in miles on earth's surface
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******************************************************/
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static double
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geo_distance_internal(Point *pt1, Point *pt2)
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{
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double long1,
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lat1,
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long2,
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lat2;
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double longdiff;
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double sino;
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/* convert degrees to radians */
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long1 = degtorad(pt1->x);
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lat1 = degtorad(pt1->y);
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long2 = degtorad(pt2->x);
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lat2 = degtorad(pt2->y);
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/* compute difference in longitudes - want < 180 degrees */
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longdiff = fabs(long1 - long2);
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if (longdiff > M_PI)
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longdiff = TWO_PI - longdiff;
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sino = sqrt(sin(fabs(lat1 - lat2) / 2.) * sin(fabs(lat1 - lat2) / 2.) +
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cos(lat1) * cos(lat2) * sin(longdiff / 2.) * sin(longdiff / 2.));
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if (sino > 1.)
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sino = 1.;
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return 2. * EARTH_RADIUS * asin(sino);
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}
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/******************************************************
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*
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* geo_distance - distance between points
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*
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* args:
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* a pair of points - for each point,
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* x-coordinate is longitude in degrees west of Greenwich
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* y-coordinate is latitude in degrees above equator
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*
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* returns: float8
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* distance between the points in miles on earth's surface
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******************************************************/
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PG_FUNCTION_INFO_V1(geo_distance);
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Datum
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geo_distance(PG_FUNCTION_ARGS)
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{
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Point *pt1 = PG_GETARG_POINT_P(0);
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Point *pt2 = PG_GETARG_POINT_P(1);
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float8 result;
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result = geo_distance_internal(pt1, pt2);
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PG_RETURN_FLOAT8(result);
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}
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