Warning: Attempt to read property "date" on null in /usr/local/www/websvn.planix.org/blame.php on line 247

Warning: Attempt to read property "msg" on null in /usr/local/www/websvn.planix.org/blame.php on line 247
WebSVN – planix.SVN – Blame – /os/branches/feature-vt/sys/src/cmd/map/libmap/gall.c – Rev 2

Subversion Repositories planix.SVN

Rev

Go to most recent revision | Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 - 1 
#include <u.h>
2 
#include <libc.h>
3 
#include "map.h"
4 
 
5 
static double scale;
6 
 
7 
static int
8 
Xgall(struct place *place, double *x, double *y)
9 
{
10 
	/* two ways to compute tan(place->nlat.l/2) */
11 
	if(fabs(place->nlat.s)<.1)
12 
		*y = sin(place->nlat.l/2)/cos(place->nlat.l/2);
13 
	else
14 
		*y = (1-place->nlat.c)/place->nlat.s;
15 
	*x = -scale*place->wlon.l;
16 
	return 1;
17 
}
18 
 
19 
proj
20 
gall(double par)
21 
{
22 
	double coshalf;
23 
	if(fabs(par)>80)
24 
		return 0;
25 
	par *= RAD;
26 
	coshalf = cos(par/2);
27 
	scale = cos(par)/(2*coshalf*coshalf);
28 
	return Xgall;
29 
}