#include<stdio.h>
#include<string.h>

/* Note:
   1. please keep the variables in the two lines at the beginning
      visible by the following two functions. (maybe including
      them into a header file.)
   2. now, lookup_maxh(period) and lookup_minh(period) will putout
      the largest and the smallest h respectively. 
   3. real data in: ((0.0 0.0 0.0) --- (54.0 33.0 -45.0).
      (x,y,z) --- (km,km,km).  
      ((17.0,12.0,0.0) --- (37.0,22.0,-1.0)                     */    

double lookup_minh(double period)
{
  double  v, fact; v = 1.0; fact=10.0; 
  return  (double) (v*period/fact);
}

double lookup_maxh(double period)
{
  double  v, fact; v = 3.0; fact=10.0; 
  return  (double) (v*period/fact);
}

double lookup_h(double x, double y, double z, double period)
{
   double  v1, v2, d, x_bound, fact;
   double  h;
   v1 = 1.0; v2 = 3.0; d = -1.0; x_bound = 9.0; fact=10.0;
   if ((z > d) && (x > x_bound))
       h = (double) (v1*period/fact); 
   else
       h = (double) (v2*period/fact); 
   return h;
}