Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/src/cmd/map/libmap/orthographic.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


#include <u.h>
#include <libc.h>
#include "map.h"


int
Xorthographic(struct place *place, double *x, double *y)
{
	*x = - place->nlat.c * place->wlon.s;
	*y = - place->nlat.c * place->wlon.c;
	return(place->nlat.l<0.? 0 : 1);
}

proj
orthographic(void)
{
	return(Xorthographic);
}

int
olimb(double *lat, double *lon, double res)
{
	static first  = 1;
	if(first) {
		*lat = 0;
		*lon = -180;
		first = 0;
		return 0;
	}
	*lon += res;
	if(*lon <= 180)
		return 1;
	first = 1;
	return -1;
}

Bell Labs OSI certified Powered by Plan 9

(Return to Plan 9 Home Page)

Copyright © 2021 Plan 9 Foundation. All Rights Reserved.
Comments to [email protected].