CoordinateInterpolator.h

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//    Copyright 2004, SenseGraphics AB
//
//    This file is part of H3D API.
//
//    H3D API 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 2 of the License, or
//    (at your option) any later version.
//
//    H3D API 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 H3D API; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//    A commercial license is also available. Please contact us at 
//    www.sensegraphics.com for more information.
//
//
//
#ifndef __COORDINATEINTERPOLATOR_H__
#define __COORDINATEINTERPOLATOR_H__

#include "X3DInterpolatorNode.h"
#include "MFVec3f.h"

namespace H3D {

  class H3DAPI_API CoordinateInterpolator : public X3DInterpolatorNode {
  public:

    struct MFValue : TypedField< MFVec3f, Types< SFFloat, MFFloat, MFVec3f > > {
      virtual void update() {
        CoordinateInterpolator *interpolator = 
            static_cast<CoordinateInterpolator*>( getOwner() );
        H3DFloat fraction = static_cast<SFFloat*>(routes_in[0])->getValue(interpolator->id);
        int key_size = static_cast<MFFloat*>(routes_in[1])->size();
        H3DFloat weight;
        int key_index = static_cast<CoordinateInterpolator*>(owner)->lookupKey( fraction, weight );
        vector< Vec3f > key_values = static_cast<MFVec3f*>(routes_in[2])->getValue();
        int value_size = key_values.size() / key_size;
        value.resize( value_size );

                if ( key_size > 0 && key_index >= 0 ) {
          if (weight<=0) 
            for (int x = 0; x < value_size; x++ )
              value[x] = key_values[ x ];
          else if (weight>=1)
            for (int x = 0; x < value_size; x++ )
              value[x] = key_values[ (key_size-1)*value_size + x];
          else { // else, interpolate linearly
            for (int x = 0; x < value_size; x++ ) {
              Vec3f a = key_values[ key_index*value_size + x ];
              Vec3f b = key_values[ (key_index+1)*value_size + x  ];
              value[ x ] = (1-weight)*a + (weight)*b;
            }
          }
        }
      }
    };
    
    CoordinateInterpolator( Inst< SFNode  >  _metadata      = 0,
                            Inst< SFFloat >  _set_fraction  = 0,
                            Inst< MFFloat >  _key           = 0,
                            Inst< MFVec3f >  _keyValue      = 0,
                            Inst< MFValue >  _value_changed = 0 );

    auto_ptr< MFVec3f >  keyValue;

    auto_ptr< MFValue >  value_changed;

    static H3DNodeDatabase database;
  };
}

#endif

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