Function:ns2thcline

void ns2thcline(float x1, float y1, float z1, float x2, float y2, float z2, 
                float red1, float green1, 
                float blue1, float red2, float green2, float blue2,float width);

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

int main(int argc, char *argv[])
{
   float x1, y1, z1;                            /* Start of line */
   float x2, y2, z2;                            /* End of line */
   float r1, g1, b1;                            /* Colour of line segment (start) */
   float r2, g2, b2;                            /* Colour of line segment (end) */
   float size;                                  /* Thickness of line */
   int N = 10;                                  /* Number of lines */
   int i;                                       /* Loop variable */

   srand48((long)time(NULL));                   /* Seed random numbers */
   s2opend("/?",argc, argv);                    /* Open the display */
   s2swin(-1.,1., -1.,1., -1.,1.);              /* Set the window coordinates */
   s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0);  /* Draw coordinate box */

   s2sci(S2_PG_YELLOW);                         /* Set colour */
   for (i=0;i<N;i++) {
      x1 = drand48()*2.0 - 1.0;                 /* Random (x,y,z) coordinates */
      y1 = drand48()*2.0 - 1.0;
      z1 = drand48()*2.0 - 1.0;
      x2 = drand48()*2.0 - 1.0;                 /* Random (x,y,z) coordinates */
      y2 = drand48()*2.0 - 1.0;
      z2 = drand48()*2.0 - 1.0;
      r1  = drand48();
      g1  = drand48();
      b1  = drand48();
      r2  = drand48();
      g2  = drand48();
      b2  = drand48();
      size = drand48()*10.0;                    /* Line thickness */
      ns2thcline(x1,y1,z1, x2,y2,z2, r1,g1,b1, r2,g2,b2, size); /* Draw the thick line */
   }

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

   return 1;
}