SteinerFunction.h

//      project:      hyperspace explorer
//      module:       SteinerFunction.H
//      contains:     Steiner surfaces -- this is sort of a dead branch, haven't
//            really implemented anything; needs to be redone to fit in
//      compile with: make all
//  author:       helge preuss (scout@hyperspace-travel.de)
//  license:      GPL (see License.txt)


#if !defined(STEINER_FUNCTION_H)
#define STEINER_FUNCTION_H

class SteinerFunction: public Function {
    public:
        SteinerFunction();
        SteinerFunction (double _umin, double _umax, double _ustep,
                         double _vmin, double _vmax, double _vstep, double _a = 2.);
        virtual ~SteinerFunction();

        virtual void Draw (void);

    protected:
        virtual VecMath::Vector<4> &f(double, double) = 0;
        virtual VecMath::Vector<4> *df (double, double);

    private:
        double a,    
               umin, 
               umax, 
               du,   
               vmin, 
               vmax, 
               dv;   

        VecMath::Vector<4> F;
};

#endif // !defined(STEINER_FUNCTION_H)