- cairo_move_to( cr, offset-4, 2);
- cairo_line_to( cr, offset+4, 2+marker_size*0.5);
- cairo_line_to( cr, offset-4, 2+marker_size);
- cairo_line_to( cr, offset-4, 2);
+ cairo_move_to( cr, x, 2.5);
+ cairo_line_to( cr, x + marker_size * .577, 2.5 + marker_size * 0.5);
+ cairo_line_to( cr, x, 2.5 + marker_size);
+ cairo_close_path(cr);