private void drawCircle(int centerX, int centerY, int radius, Graphics g) {
        int x = 0;
        int y = radius;
        int d = 3 - 2 * radius;

        while (x <= y) {
            // Dibujar los octantes
            g.drawRect(centerX + x, centerY + y, 1, 1);
            g.drawRect(centerX - x, centerY + y, 1, 1);
            g.drawRect(centerX + x, centerY - y, 1, 1);
            g.drawRect(centerX - x, centerY - y, 1, 1);
            g.drawRect(centerX + y, centerY + x, 1, 1);
            g.drawRect(centerX - y, centerY + x, 1, 1);
            g.drawRect(centerX + y, centerY - x, 1, 1);
            g.drawRect(centerX - y, centerY - x, 1, 1);

            if (d < 0) {
                d = d + 4 * x + 6;
            } else {
                d = d + 4 * (x - y) + 10;
                y--;
            }
            x++;
        }
    }