GB/GB_FwdDiff.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Cristin Barghiel
 *      Side Effects Software Inc.
 *      20 Maud St.
 *      Toronto, Ontario,  M5V 2M5
 *      Canada
 *      416-366-4607
 *
 * NAME:        Geometry Library (C++)
 *
 * COMMENTS:
 *      A class that implements forward differencing for parametric functions.
 *      Handles orders up to GB_MAXORDER. The code does fwd. differencing on
 *      surfaces and curves.
 *
 * 
 */


#ifndef __GB_FwdDiff_h__
#define __GB_FwdDiff_h__

#include "GB_API.h"
#include <SYS/SYS_Types.h>
#include "GB_Defines.h" // defines GB_MAXORDER

class GB_API GB_FwdDiff {
public:
    // Constructor that takes the U anv V order of the functions, and
    // the stepsize in each parametric direction. vOrd should be 1 when 
    // dealing with curves.
    GB_FwdDiff(int uOrd=4, fpreal uIncrem=1.0f, int vOrd=1, fpreal vIncrem=1.0f);

    // Trivial destructor.
    virtual ~GB_FwdDiff() { }

    // Initialize the differencer with data. This is a no-op if the
    // differencer is already using those parameters.
    void        initialize(int uOrd=4, fpreal uIncrem=1.0f,
                           int vOrd=1, fpreal vIncrem=1.0f);

    // Query the private elements. 
    int         getUOrder(void) const   { return uOrder; }
    int         getVOrder(void) const   { return vOrder; }
    fpreal      getUStep(void) const    { return uStep; }
    fpreal      getVStep(void) const    { return vStep; }

protected:
   // The order of the functions in U and V directions.
   int uOrder;
   int vOrder;

   // The walking increment.
   fpreal uStep;
   fpreal vStep;

   // Matrices that store results to be shared between calls to walk().
   fpreal uMatx[GB_MAXORDER][GB_MAXORDER];
   fpreal vMatx[GB_MAXORDER][GB_MAXORDER];

private:

};

#endif

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