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WebSVN – planix.SVN – Blame – /os/branches/feature-vt/sys/src/cmd/map/libmap/orthographic.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include "map.h"
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int
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Xorthographic(struct place *place, double *x, double *y)
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{
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	*x = - place->nlat.c * place->wlon.s;
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	*y = - place->nlat.c * place->wlon.c;
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	return(place->nlat.l<0.? 0 : 1);
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}
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proj
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orthographic(void)
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{
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	return(Xorthographic);
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}
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int
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olimb(double *lat, double *lon, double res)
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{
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	static first  = 1;
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	if(first) {
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		*lat = 0;
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		*lon = -180;
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		first = 0;
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		return 0;
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	}
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	*lon += res;
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	if(*lon <= 180)
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		return 1;
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	first = 1;
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	return -1;
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}