// https://archive.org/details/HAKMEM/page/n73/mode/1up
// articles 149-152

#include <TVout.h>
TVout TV;

void setup() {
  TV.begin(PAL);
}

bool inCircle(int px, int py, int radius) {
    return (px*px + py*py) <= (radius*radius);
}

bool onCircleLine(int px, int py, int radius, int thiccness) {
    return  inCircle(px, py, radius + thiccness/2) &&
           !inCircle(px, py, radius - thiccness/2);
}

void loop() {

  int16_t cx = 70;
  int16_t cy = 50;
  int16_t cr = 25;
  int16_t ct = 8;

  for (int16_t x = 0; x < 200; x++)
  for (int16_t y = 0; y < 200; y++)
  if (onCircleLine(x - cx, y - cy, cr, ct))
     TV.set_pixel(x, y, 1);

  return 0;
}