const GL::Color &get_font_color() const { return font_color; }
const PartSeq &get_parts() const { return parts; }
const Part *get_part(const std::string &) const;
const GL::Color &get_font_color() const { return font_color; }
const PartSeq &get_parts() const { return parts; }
const Part *get_part(const std::string &) const;