// circle image
//
#include <math.h>
#include "ppm.h"

int main( void)
{
  ppm a = ppm_new(500,500);

  for( int i = 0; i < a.rows; ++i) for( int j = 0; j < a.cols; ++j) {

    int x = j-250, y = i-250; double d = sqrt(x*x+y*y); // distance from center

    if( d < 100 ) { // inside the circle
      a.r[i][j] = 255; a.g[i][j] = a.b[i][j] = 0; // red
    } else { // outside the circle
      a.r[i][j] = a.g[i][j] = a.b[i][j] = 255; // white
    }
  }

  ppm_write( a);

  return 0;
}