double string_to_fraction (std::string const &) const;
void view_to_model_coord (double& x, double& y) const;
void view_to_model_coord_y (double &) const;
void model_to_view_coord (double& x, double& y) const;
void model_to_view_coord_y (double &) const;
double string_to_fraction (std::string const &) const;
void view_to_model_coord (double& x, double& y) const;
void view_to_model_coord_y (double &) const;
void model_to_view_coord (double& x, double& y) const;
void model_to_view_coord_y (double &) const;