hermitespline.h

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  This program is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
/***********************************************************************************************
 ***              C O N F I D E N T I A L  ---  W E S T W O O D  S T U D I O S               ***
 ***********************************************************************************************
 *                                                                                             *
 *                 Project Name : WWMath                                                       *
 *                                                                                             *
 *                     $Archive:: /VSS_Sync/wwmath/hermitespline.h                            $*
 *                                                                                             *
 *                       Author:: Greg Hjelstrom                                               *
 *                                                                                             *
 *                     $Modtime:: 6/13/01 2:18p                                               $*
 *                                                                                             *
 *                    $Revision:: 7                                                           $*
 *                                                                                             *
 *---------------------------------------------------------------------------------------------*
 * Functions:                                                                                  *
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
 
#if defined(_MSC_VER)
#pragma once
#endif
 
#ifndef HERMITE_H
#define HERMITE_H
 
#include "curve.h"
 
/*
** HermiteSpline3DClass
** 3-Dimensional hermite spline interpolation
** Hermite splines require you to input all of the tangents...
*/
class HermiteSpline3DClass : public Curve3DClass
{
public:
    HermiteSpline3DClass(void)
        : TangentsDirty (true) { }
 
    HermiteSpline3DClass(const HermiteSpline3DClass &that)
        : TangentsDirty (true) { (*this) = that; }
 
    const HermiteSpline3DClass &operator= (const HermiteSpline3DClass &that);
    
    virtual void        Evaluate(float time,Vector3 * set_val);
    virtual void        Evaluate_Derivative(float time,Vector3 * set_val);
    virtual void        Set_Looping(bool onoff);
    
    virtual void        Set_Key(int i,const Vector3 & point);
    virtual int         Add_Key(const Vector3 & point,float t);
    virtual void        Remove_Key(int i);
    virtual void        Clear_Keys(void);
 
    virtual void        Set_Tangents(int i,const Vector3 & in_tan,const Vector3 & out_tan);
    virtual void        Get_Tangents(int i,Vector3 * set_in,Vector3 * set_out);
 
    virtual void        Update_Tangents(void) { TangentsDirty = false; }
 
    // save-load support
    virtual const PersistFactoryClass &  Get_Factory(void) const;
    virtual bool                                Save(ChunkSaveClass &csave);
    virtual bool                                Load(ChunkLoadClass &cload);
 
protected:
 
    class TangentsClass
    {
    public:
        Vector3          InTangent;
        Vector3          OutTangent;
        bool                operator == (const TangentsClass & that) { return ((InTangent == that.InTangent) && (OutTangent == that.OutTangent)); }
        bool                operator != (const TangentsClass & that) { return !TangentsClass::operator == (that); }
    };  
 
    bool                                            TangentsDirty;
    DynamicVectorClass<TangentsClass>  Tangents;
};
 
 
/*
** HermiteSpline1DClass
** 1-Dimensional hermite spline interpolation
** Hermite splines require you to input all of the tangents...
*/
class HermiteSpline1DClass : public Curve1DClass
{
public:
    HermiteSpline1DClass (void)
        : TangentsDirty (true) { }
    
    virtual void        Evaluate(float time,float * set_val);
    virtual void        Set_Looping(bool onoff);
    
    virtual void        Set_Key(int i,float point,unsigned int extra=0);
    virtual int         Add_Key(float point,float t,unsigned int extra=0);
    virtual void        Remove_Key(int i);
    virtual void        Clear_Keys(void);
 
    virtual void        Set_Tangents(int i,float in_tan,float out_tan);
    virtual void        Get_Tangents(int i,float * set_in,float * set_out);
 
    // save-load support
    virtual const PersistFactoryClass &  Get_Factory(void) const;
    virtual bool                                Save(ChunkSaveClass &csave);
    virtual bool                                Load(ChunkLoadClass &cload);
    
protected:
 
    class TangentsClass
    {
    public:
        float           InTangent;
        float           OutTangent;
        bool                operator == (const TangentsClass & that) { return ((InTangent == that.InTangent) && (OutTangent == that.OutTangent)); }
        bool                operator != (const TangentsClass & that) { return !TangentsClass::operator == (that); }
    };
 
    virtual void        Update_Tangents(void) { TangentsDirty = false; }
 
    bool                                            TangentsDirty;
    DynamicVectorClass<TangentsClass>  Tangents;
};
 
 
#endif