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Annotation of researchv10no/cmd/map/libmap/lambert.c, revision 1.1.1.1

1.1       root        1: #include "map.h"
                      2: 
                      3: static struct coord stdp0, stdp1;
                      4: static double k;
                      5: 
                      6: static int
                      7: Xlambert(struct place *place, double *x, double *y)
                      8: {
                      9:        double r;
                     10:        if(place->nlat.l < -80.*RAD)
                     11:                return(-1);
                     12:        if(place->nlat.l > 89.*RAD)
                     13:                r = 0;  /* slovenly */
                     14:        else
                     15:                r = stdp0.c*exp(0.5*k*log(
                     16:                   (1+stdp0.s)*(1-place->nlat.s)/((1-stdp0.s)*(1+place->nlat.s))));
                     17:        if(stdp1.l<0.)
                     18:                r = -r;
                     19:        *x = - r*sin(k * place->wlon.l);
                     20:        *y = - r*cos(k * place->wlon.l);
                     21:        return(1);
                     22: }
                     23: 
                     24: proj
                     25: lambert(double par0, double par1)
                     26: {
                     27:        double temp;
                     28:        if(fabs(par0)>fabs(par1)){
                     29:                temp = par0;
                     30:                par0 = par1;
                     31:                par1 = temp;
                     32:        }
                     33:        deg2rad(par0, &stdp0);
                     34:        deg2rad(par1, &stdp1);
                     35:        if(fabs(par1+par0)<.1) 
                     36:                return(mercator());
                     37:        if(fabs(par1-par0)<.1)
                     38:                return(perspective(-1.));
                     39:        if(fabs(par0)>89.5||fabs(par1)>89.5)
                     40:                return(0);
                     41:        k = 2*log(stdp1.c/stdp0.c)/log(
                     42:                (1+stdp0.s)*(1-stdp1.s)/((1-stdp0.s)*(1+stdp1.s)));
                     43:        return(Xlambert);
                     44: }

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