Function:ss2qnfp

void ss2qnfp(double *near, double *far);

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "s2plot.h"

void cb(double *t, int *kc)
{
   XYZ foc = { 0, 0, 0 };                       /* Set the camera focus */
   ss2scf(foc, 1);

   if (*kc % 2 == 1)
      ss2snfe(0.5);                             /* Change the near/far */
   else                                         /*  expansion factor */
      ss2snfe(1.0);                             /*  on <space> press */

   double near, far;                            /* Distance to near/far clip planes */
   ss2qnfp(&near, &far);                        /* Query these distances */
   char string[64];                             /* Output as a string */
   sprintf(string,"Clipping plane distances: Near = %.2lf Far = %.2lf",near, far);
   s2lab("","","",string);                      /* Show the string as a screen label */

}

int main(int argc, char *argv[])
{
   srand48((long)time(NULL));                   /* Seed random numbers */
   s2opend("/s2dsana", argc, argv);             /* Open in anaglyph mode */
   s2swin(-1.,1., -1.,1., -1.,1.);              /* Set the window coordinates */
   s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0);  /* Draw coordinate box */

   int i, N = 500;                              /* Loop variables */
   float bound = 2.0;                           /* Bound bigger than window */
   XYZ xyz;                                     /* Point location */
   COLOUR rgb;                                  /* Point colour */
   for (i=0;i<N;i++) {
      xyz.x = 0.0;
      xyz.y = 0.0;
      xyz.z = drand48()*(2.0*bound) - bound;    /* Random z-value for point */
      rgb.r = drand48();
      rgb.g = drand48();
      rgb.b = drand48();
      ns2vthpoint(xyz, rgb, 3);                 /* Draw the point */
   }
   cs2scb(cb);                                  /* Install a dynamic callback */

   XYZ pos = { 0.0, 0.0, +5.0 };                /* Move the camera closer */
   XYZ vd = { 0.0, 0, -1.0 };
   XYZ up = { 0.0, 1.0, 0 };
   ss2sc(pos, up, vd, 1);

   XYZ foc = { 0, 0, 0 };                       /* Set the camera focus */
   ss2scf(foc, 1);

   s2textxy(-1,0.1,0,"Rotate camera and press <space>");
   s2textxy(-0.5,-0.1,0,"to see effect of ss2snfe");

   s2show(1);                                   /* Open the s2plot window */

   return 1;
}