osgheightfield.h

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/***************************************************************************
 *   Copyright (C) 2005 by Robot Group Leipzig                             *
 *    martius@informatik.uni-leipzig.de                                    *
 *    fhesse@informatik.uni-leipzig.de                                     *
 *    der@informatik.uni-leipzig.de                                        *
 *                                                                         *
 *   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 2 of the License, or     *
 *   (at your option) any later version.                                   *
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 *   This program is distributed in the hope that it will be useful,       *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
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 *   Free Software Foundation, Inc.,                                       *
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 ***************************************************************************
 *                                                                         *
 *  DESCRIPTION                                                            *
 *                                                                         *
 *   $Log: osgheightfield.h,v $
 *   Revision 1.2  2006/07/14 12:23:35  martius
 *   selforg becomes HEAD
 *
 *   Revision 1.1.2.2  2006/05/29 20:10:06  martius
 *   docu
 *
 *   Revision 1.1.2.1  2006/05/28 22:14:56  martius
 *   heightfield included
 *
 *   Revision 1.1.2.1  2005/12/06 17:38:21  martius
 *   *** empty log message ***
 *
 *                                                                 *
 ***************************************************************************/
#ifndef __OSGHEIGHTFIELD_H
#define __OSGHEIGHTFIELD_H


#include "osgprimitive.h"
#include <osg/Shape>

namespace lpzrobots {

  /**
     Graphical HeightField
  */
  class OSGHeightField : public OSGPrimitive {
  public:

    /// height coding using in the read in bitmap.
    // Red: just the red channel is used;
    // Sum: the sum of all channels is used;
    // HighMidLow: Blue is least significant, Green is medium significant and Red is most significant
    typedef enum CodingMode {Red, Sum, LowMidHigh};
      

    OSGHeightField(osg::HeightField* heightfield,float x_size, float y_size);    
    OSGHeightField(const std::string& filename, float x_size, float y_size, float height);

    virtual void setMatrix(const osg::Matrix& matrix);
    virtual void init(const OsgHandle& osgHandle, Quality quality = Middle);

    virtual const osg::HeightField* getHeightField() const { return field; }

    /** loads an ppm image and returns the height field using the given coding and the height 
        (maximal height of the heightfield)
    */
    static osg::HeightField* loadFromPPM(const std::string& filename, double height, 
                                         CodingMode codingMode=Red);
    /// return the height using the given coding mode. The data pointer points to RGB data point
    static double coding(CodingMode mode, const unsigned char* data);

  protected:
    osg::HeightField* field;
    float x_size;
    float y_size;
  };



}

#endif

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