X3DInterpolatorNode.h

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//    Copyright 2004-2019, 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 __X3DINTERPOLATORNODE_H__
#define __X3DINTERPOLATORNODE_H__
 
#include <H3D/X3DChildNode.h>
#include <H3D/SFFloat.h>
#include <H3D/MFFloat.h>
 
namespace H3D {
 
  class H3DAPI_API X3DInterpolatorNode : public X3DChildNode {
  public:
    
    X3DInterpolatorNode( Inst< SFNode  > _metadata     = 0,
                         Inst< SFFloat > _set_fraction = 0,
                         Inst< MFFloat > _key          = 0 );
 
    int lookupKey( H3DFloat f, H3DFloat &w ) {
      w = 0;
      vector<H3DFloat> keys = key->getValue();
      if( keys.size() == 0 ) return -1;
 
      if ( keys.size() == 1 || f <= keys[0] ) {
        w = 0;
        return 0;
      }
      if ( f >= keys[keys.size()-1] ) {
        w = 1;
        return (int)keys.size() - 2;
      }
 
      // we know here that f is larger than keys[0] so we know that we will
      // go into the if-statement at some point.
      for( size_t i = keys.size()-1; true; --i) {
        if ( f > keys[i] ) {
          w = (f-keys[i])/(keys[i+1]-keys[i]);
          if( w < 0 ) w = 0;
          if( w > 1 ) w = 1;
          return (int) i;
        }
      }
      return -1;  // something must have gone wrong to get here
    }
 
    H3DUniquePtr< SFFloat > set_fraction;
 
    H3DUniquePtr< MFFloat > key;
 
    static H3DNodeDatabase database;
  };
}
 
#endif