plan9port

fork of plan9port with libvec, libstr and libsdb
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cylequalarea.c (355B)

      1 #include <u.h>
      2 #include <libc.h>
      3 #include "map.h"
      4 
      5 static double a;
      6 
      7 static int
      8 Xcylequalarea(struct place *place, double *x, double *y)
      9 {
     10 	*x = - place->wlon.l * a;
     11 	*y = place->nlat.s;
     12 	return(1);
     13 }
     14 
     15 proj
     16 cylequalarea(double par)
     17 {
     18 	struct coord stdp0;
     19 	if(par > 89.0)
     20 		return(0);
     21 	deg2rad(par, &stdp0);
     22 	a = stdp0.c*stdp0.c;
     23 	return(Xcylequalarea);
     24 }