valuenode_derivative.h

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/* === S Y N F I G ========================================================= */
/* ========================================================================= */

/* === S T A R T =========================================================== */

#ifndef __SYNFIG_VALUENODE_DERIVATIVE_H
#define __SYNFIG_VALUENODE_DERIVATIVE_H

/* === H E A D E R S ======================================================= */

#include <synfig/valuenode.h>

/* === M A C R O S ========================================================= */

/* === C L A S S E S & S T R U C T S ======================================= */

namespace synfig {

// Class ValueNode_Derivative
// Implementation of a derivateive based on finite diferences
// See: http://en.wikipedia.org/wiki/Finite_difference
// and http://en.wikipedia.org/wiki/Finite_difference_coefficients

class ValueNode_Derivative : public LinkableValueNode
{

    ValueNode::RHandle link_;         // Value Node whom is calculated the derivative
    ValueNode::RHandle interval_;     // Size of the interval to calculate the finite differences
    ValueNode::RHandle accuracy_;     // Accuracy order
    ValueNode::RHandle order_;        // First or Second order derivative

    ValueNode_Derivative(const ValueBase &value);

public:

    enum Accuracy
    {
        ROUGH     =0,
        NORMAL    =1,
        FINE      =2,
        EXTREME   =3
    };
    enum Order
    {
        FIRST     =0,
        SECOND    =1
    };
    typedef etl::handle<ValueNode_Derivative> Handle;
    typedef etl::handle<const ValueNode_Derivative> ConstHandle;

    virtual ValueBase operator()(Time t)const;

    virtual ~ValueNode_Derivative();

    virtual String get_name()const;
    virtual String get_local_name()const;

    virtual ValueNode::LooseHandle get_link_vfunc(int i)const;

protected:
    LinkableValueNode* create_new()const;
    virtual bool set_link_vfunc(int i,ValueNode::Handle x);

public:
    using synfig::LinkableValueNode::get_link_vfunc;

    using synfig::LinkableValueNode::set_link_vfunc;
    static bool check_type(Type &type);
    static ValueNode_Derivative* create(const ValueBase &x);
    virtual Vocab get_children_vocab_vfunc()const;
}; // END of class ValueNode_Derivative

}; // END of namespace synfig

/* === E N D =============================================================== */

#endif