cairo_move_to (cr, 50.0, 75.0);
cairo_line_to (cr, 200.0, 75.0);
cairo_move_to (cr, 50.0, 125.0);
cairo_line_to (cr, 200.0, 125.0);
cairo_move_to (cr, 50.0, 175.0);
cairo_line_to (cr, 200.0, 175.0);
cairo_set_line_width (cr, 30.0);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_stroke (cr);