Function:s2qch

float s2qch(void);

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

void cb(double *t, int *kc)
{
   static int lkc = 0;                  /* Count of key presses */

   if (lkc != *kc) {                    /* Space bar pressed? */
      s2sch(drand48()*5+1);             /* Choose random height */
   }

   float qch = s2qch();                   /* Query character height */
   char string[32];                     
   sprintf(string,"Height = %.2f",qch);   /* Write to string */
   s2textxy(-1,0,0,string);              /* Display text */

   lkc = *kc;                           /* Update count */
}

int main(int argc, char *argv[])
{
   fprintf(stderr,"Press the <spacebar> to change character height");

   s2opend("/s2mono", argc, argv);              /* Open in mono 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 */
   
   cs2scb(cb);                                  /* Install dynamic callback */
   s2show(1);                                   /* Open the s2plot window */

   return 1;
}