marker_square
case marker_square: square(x, y, r); break;
case marker_square: do { square (int(*x), int(*y), int(r)); ++x; ++y; } while(--n); break;
case marker_square: do { square (int(*x), int(*y), int(*r)); ++x; ++y; ++r; } while(--n); break;
case marker_square: do { base_type::fill_color(*fc); square (int(*x), int(*y), int(*r)); ++x; ++y; ++r; ++fc; } while(--n); break;
case marker_square: do { base_type::fill_color(*fc); base_type::line_color(*lc); square (int(*x), int(*y), int(*r)); ++x; ++y; ++r; ++fc; ++lc; } while(--n); break;