rb_define_method (c, "direction", c_direction_get, 0);
rb_define_method (c, "direction=", c_direction_set, 1);
rb_define_method (c, "spacing", c_spacing_get, 0);
rb_define_method (c, "direction", c_direction_get, 0);
rb_define_method (c, "direction=", c_direction_set, 1);
rb_define_method (c, "spacing", c_spacing_get, 0);