// color shades
//
#include <stdio.h>
#include <math.h>
 
#include "ppm.h"
 
int main( void)
{
  ppm a = ppm_new( 256, 256);
 
  // double s2 = sqrt(2);
 
  for( int i = 0; i < 256; ++i)
    for( int j = 0; j < 256; ++j)
    {
      a.r[i][j] = i;
 
      // a.g[i][j] = 255 - hypot(i,j)/s2;
 
      int g = 255 - hypot(i,j);
 
      a.g[i][j] = (g >= 0) ? g : 0;
 
      a.b[i][j] = j;
    }
 
  ppm_write(a);
 
  return 0;
}