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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/cmd/map/libmap/newyorker.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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static double a;
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static int
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Xnewyorker(struct place *place, double *x, double *y)
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{
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	double r = PI/2 - place->nlat.l;
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	double s;
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	if(r<.001)	/* cheat to plot center */
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		s = 0;
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	else if(r<a)
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		return -1;
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	else
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		s = log(r/a);
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	*x = -s * place->wlon.s;
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	*y = -s * place->wlon.c;
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	return(1);
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}
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proj
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newyorker(double a0)
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{
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	a = a0*RAD;
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	return(Xnewyorker);
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}