ossimKmlSuperOverlayReader.h

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//*******************************************************************
// Copyright (C) 2000 ImageLinks Inc.
//
// License:  LGPL
// 
// See LICENSE.txt file in the top level directory for more details.
//
// Author:  Mingjie Su, Harsh Govind
//
// Description:
//
// Contains class definition for the class "ossimKmlSuperOverlayReader".
// ossimKmlSuperOverlayReader is derived from ImageHandler which is derived from
// TileSource. It is for displaying the information from kml super overlay.
//
//*******************************************************************
//  $Id: ossimKmlSuperOverlayReader.h 2178 2011-02-17 18:38:30Z ming.su $

#ifndef ossimKmlSuperOverlayReader_HEADER
#define ossimKmlSuperOverlayReader_HEADER

//Ossim Includes
#include <ossim/imaging/ossimImageHandler.h>
#include <ossim/base/ossimIrect.h>
#include <ossim/base/ossimDrect.h>

class ossimProjection;
class ossimMapProjection;
class ossimXmlDocument;

class ossimKmlSuperOverlayReader : public ossimImageHandler
{

public:

   ossimKmlSuperOverlayReader();
   virtual ~ossimKmlSuperOverlayReader();

   virtual void close();

   virtual bool open();

   virtual ossimRefPtr<ossimImageData> getTile(const ossimIrect& tileRect,
                                               ossim_uint32 resLevel=0);

   virtual ossim_uint32 getNumberOfInputBands() const;

   virtual ossim_uint32 getNumberOfOutputBands() const;
  
   virtual ossim_uint32 getNumberOfLines(ossim_uint32 reduced_res_level = 0) const;

   virtual ossim_uint32 getNumberOfSamples(ossim_uint32 reduced_res_level = 0) const;

   virtual ossimIrect getImageRectangle(ossim_uint32 reduced_res_level = 0) const;

   virtual bool saveState(ossimKeywordlist& kwl,
                          const char* prefix=0)const;

   virtual bool loadState(const ossimKeywordlist& kwl,
                          const char* prefix=0);

   virtual ossim_uint32 getImageTileWidth() const;

   virtual ossim_uint32 getImageTileHeight() const;   
   
   virtual ossimRefPtr<ossimImageGeometry> getInternalImageGeometry() const;

   virtual ossimRefPtr<ossimImageGeometry> getImageGeometry();

   ossimScalarType getOutputScalarType() const;

   virtual bool isOpen()const;
   
   ossimMapProjection* createDefaultProj(ossim_float64 north, ossim_float64 south, ossim_float64 east, ossim_float64 west);

private:

   bool getCoordinate(std::vector<ossimRefPtr<ossimXmlNode> > nodes,
                      ossim_float64& north,
                      ossim_float64& south,
                      ossim_float64& east,
                      ossim_float64& west);

   ossimRefPtr<ossimXmlNode> findLatLonNode(std::vector<ossimRefPtr<ossimXmlNode> >nodes);

   bool isKmlSuperOverlayFile(std::vector<ossimRefPtr<ossimXmlNode> > nodes);

   bool getTopLevelKmlFileInfo();

   ossimRefPtr<ossimXmlDocument>       m_xmlDocument;
   ossimRefPtr<ossimImageGeometry>     theImageGeometry;
   ossimDrect                          theImageBound;

TYPE_DATA
};

#endif