/* p12.c */

/* Construct a solid color image of the specified color */

/* Command line arguments:                              */
/*     width  in pixels                                 */
/*     height in pixels                                 */
/*     red value                                        */
/*     green value                                      */
/*     blue value                                       */

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

unsigned char image[300 * 200];

#if 0
unsigned char pix_value(
int r,
int c)
{
    unsigned char pix;

    pix = 28 + (r + c) % 200;
    return(pix);
}

unsigned char pix_value(
int r,
int c)
{
    unsigned char pix;

    pix = (((r - 100) * (r - 100) + (c - 150) * (c - 150)) / 50) % 255;
    return(pix);
 }
#endif

unsigned char pix_value(
int r,
int c)
{
    unsigned char pix;

    pix = (r * r + c * c) % 255;

    return(pix);
 }

int main(
int argc,
char **argv)
{
   int ndx = 0;
   int row;
   int col;


   while (ndx < (300 * 200))
   {
      row = ndx / 300;
      col = ndx % 300;

      image[ndx] = pix_value(row, col);

      ndx = ndx + 1;
   }
   fprintf(stdout, "P5\n");
   fprintf(stdout, "%d %d 255\n", 300, 200);
   fwrite(image, 300, 200, stdout);
   return(0);
}