GD/GD_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
 *      curves.
 *
 * 
 */


#ifndef __GD_FwdDiff_h__
#define __GD_FwdDiff_h__

#include "GD_API.h"
#include <GB/GB_FwdDiff.h>

class UT_Vector3;

class GD_API GD_FwdDiff : public 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.
    GD_FwdDiff(int uOrd=4, float uIncrem=1.f, int vOrd=1, float vIncrem=1.f)
        : GB_FwdDiff(uOrd, uIncrem, vOrd, vIncrem) {}

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

    // Do an incremental walk of uCount x vCount steps. Read in the 
    // derivatives and produce the corresponding points. The first walk()
    // is for surfaces, and the seond one for curves.
    void        walk(unsigned uCount, unsigned crtUCount,
                     UT_Vector3 df[GB_MAXORDER], UT_Vector3 *val);

protected:
private:
    // Nothing.
};

#endif

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