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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 struct coord stdpar;
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static int
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Xconic(struct place *place, double *x, double *y)
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{
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	double r;
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	if(fabs(place->nlat.l-stdpar.l) > 80.*RAD)
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		return(-1);
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	r = stdpar.c/stdpar.s - tan(place->nlat.l - stdpar.l);
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	*x = - r*sin(place->wlon.l * stdpar.s);
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	*y = - r*cos(place->wlon.l * stdpar.s);
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	if(r>3) return(0);
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	return(1);
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}
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proj
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conic(double par)
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{
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	if(fabs(par) <.1)
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		return(Xcylindrical);
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	deg2rad(par, &stdpar);
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	return(Xconic);
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}