// generating a zig-zag image
//
#include <stdio.h>
#include "ppm.h"

int main( void)
{
  ppm a = ppm_new( 500, 600); // sets a.rows, a.cols

  for( int i = 0; i < a.rows; ++i)
  {
    for( int j = 0; j < a.cols; ++j)
    {
      // a.r[i][j] = a.g[i][j] = a.b[i][j] = 0;
      a.r[i][j] = (i + j) % 256;
      a.g[i][j] = (10*i + j) % 256;
      a.b[i][j] = (1100 -i - j) % 256;
    }
  }

  ppm_write( a);

  return 0;
}