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Haar.h

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/*
    File:       Haar.h

    Function:   Implements haar wavelet basis over an element

    Author:     Andrew Willmott

    Copyright:  (c) 1996-2000, Andrew Willmott
*/

#ifndef __Haar__
#define __Haar__

#include "HRMesh.h"

class HaarElem;

class HaarLink : public HRLink
{
public:
    HRLink          *New() { return new HaarLink; };

    HaarElem        *To()   { return((HaarElem*) to); };
    HaarElem        *From() { return((HaarElem*) from); };

    Void            Gather();   
    Bool            CalcTransport();
    Bool            CalcVisibility(HRLink *parent, Bool reuse);
    GCLReal         Error();
    GCLReal         BFAError();

    Void            Print(ostream &s);
    Void            DrawLink(Renderer &r, 
                        GCLReal left, GCLReal top,
                        GCLReal right, GCLReal bottom, 
                        GCLReal weight
                    );

    GCLReal         Strength() { return(transport); };
    
    GCLReal         transport;
    GCLReal         error;
};

class HaarElem : public HRMeshElem
{
public:
    Void        SetParent(HierElem &parent);
    StrConst    Name() { return("haar"); };
    HierElem    *New() { return(new HaarElem); };

    Colour      SampleLeaf(Coord c);
    Void        Print(ostream &s);
    Void        PrintSelf(ostream &s);
    Void        ParseSelf(istream &s);
    
    Void        DistributeColours();
    Void        DistributeColoursBest(ShadeInfo &shadeInfo);

    Void        Add();
    Void        Push();
    Void        Pull();
    Void        CalcLeafRadiosity();
    GCLReal     Error();
    Void        ClearB();
    Void        ClearR();

    HaarElem    *Child(Int i)
                { return((HaarElem*) child[i]); };

    // gen wave stuff
    Void        EltSampleTransport(Int numSamples, Point p[], Vector n[],
                        Matd &coeffs);
    GCLReal     EltCalcTransport(HRElem *from, Matd &coeffs);

    Void        AddIrradiance(const Colour &E, const Vector &m);
    Colour      GetPower(const Vector &m);

    Int         NumCoeffs() { return(1); };
    Colour      *B_Coeffs() { return(&B); };
    Colour      *R_Coeffs() { return(&R); };

    // Fields
    Colour      B;
    Colour      R;
    static Colour lastB;

};

#endif

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