windowfunction.h

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#ifndef windowfunction_h
#define windowfunction_h

/*+
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        Kristofer
 Date:          2007
 RCS:           $Id$
________________________________________________________________________

-*/


#include "algomod.h"
#include "factory.h"
#include "mathfunc.h"


mExpClass(Algo) WindowFunction : public FloatMathFunction
{
public:
    virtual const char* name() const                    = 0;
    virtual bool        hasVariable() const             { return false; }
    virtual float       getVariable() const             { return mUdf(float); }
    virtual bool        setVariable(float)              { return true; }
    virtual const char* variableName() const            { return 0; }
    virtual bool        isAcceptableVariable(float) const       { return true; }

    static const char*  sKeyVariable()                  { return "Variable"; }
    static const char*  sKeyTaperVal()                  { return "taperval"; }
    static bool         hasVariable(const BufferString& wintyp);

    void                fillPar(IOPar&) const;
    bool                usePar(const IOPar&);

#define mDeclWFStdFns(nm) \
    static void                 initClass(); \
    static const char*          sName()         { return #nm; }\
    static WindowFunction*      create()        { return new nm##Window; } \
    const char*                 name() const    { return #nm; } \
    float       getValue(float) const; \
    float       getValue( const float* x ) const { return getValue(*x); }

    static void         addAllStdClasses(); // done by Algo/initalgo.cc

};


#define mDeclWFSimpleClass(nm) \
mExpClass(Algo) nm##Window : public WindowFunction \
{ \
public: \
    mDeclWFStdFns(nm); \
};

mDeclWFSimpleClass(Box)
mDeclWFSimpleClass(Hamming)
mDeclWFSimpleClass(Hanning)
mDeclWFSimpleClass(Blackman)
mDeclWFSimpleClass(Bartlett)
mDeclWFSimpleClass(FlatTop)


#define mDeclWFClassWithVariable(clss) \
                                clss##Window(); \
    bool                        hasVariable() const     { return true; } \
    bool                        setVariable(float); \
    bool                        isAcceptableVariable(float) const; \


mExpClass(Algo) CosTaperWindow : public WindowFunction
{
public:

    mDeclWFStdFns(CosTaper)
    mDeclWFClassWithVariable(CosTaper)

    float                       getVariable() const     { return threshold_; }
    const char*                 variableName() const
                                { return "Taper length";}

    static bool                 isLegacyTaper(const BufferString&);
    static float                getLegacyTaperVariable(const BufferString&);

protected:

    float                       threshold_;
    float                       factor_;
};


mExpClass(Algo) KaiserWindow : public WindowFunction
{
public:

    mDeclWFStdFns(Kaiser)
    mDeclWFClassWithVariable(Kaiser)

                                KaiserWindow(double twidth,int nrsamples);
    bool                        set(double width,int nrsamples);
                                //Alternate way of setting alpha

    float                       getVariable() const     { return (float)alpha_;}
    const char*                 variableName() const    { return "alpha"; }

                                // Variable must be set first
    double                      getWidth() const        { return width_; }
    double                      getError() const;
    int                         getLength() const       { return ns_; }
    double                      getWidth(int nrsamples) const;
    double                      getError(int nrsamples) const;

protected:

    double                      alpha_;
    double                      denom_;
    double                      width_;
    int                         ns_;
};


mDefineFactory(Algo,WindowFunction,WINFUNCS);


#endif