SoTransferFunctionElement.h

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**=======================================================================*/
/*=======================================================================
** Author      : P. ESTRADE (Mar 2000)
**=======================================================================*/
 
 
#ifndef  _SO_TRANSFER_FUNCTION_ELEMENT_
#define  _SO_TRANSFER_FUNCTION_ELEMENT_
 
#ifdef _MSC_VER
#pragma warning( push )
#pragma warning(disable:4251)
#endif
 
#include <Inventor/nodes/SoShaderParameter.h>
 
#include <Inventor/elements/SoAccumulatedElement.h>
 
#include <Inventor/STL/vector>
#include <Inventor/STL/map>
 
class SoTransferFunction;
class SoGLRenderAction;

SoEXTENDER_Documented class  SoTransferFunctionElement : public SoAccumulatedElement {
  SO_ELEMENT_HEADER( SoTransferFunctionElement );
 
public:

  static void set(SoState* state, SoNode *node, SoTransferFunction *m_transferFunctionNode);
  static void get(SoState* state, SoTransferFunction *&m_transferFunctionNode);

  static void get(SoState* state, std::vector<SoTransferFunction*>&);

  static void getDefault(SoTransferFunction *&m_transferFunctionNode);

  static SbBool hasTransparency(SoState *state);
 
  // Overrides push() method to copy values from next instance in the stack
  virtual void push(SoState *state) ;
 
private:

  virtual void init(SoState* state);
 
private:
  typedef std::vector<SoTransferFunction*> TransferFunctionVector;
  typedef TransferFunctionVector::iterator TransferFunctionVectorIt;
  typedef std::map<int, SoTransferFunction*> TransferFunctionMap;
 
  // Initializes the SoVolumeData class
  static void initClass();
  static void exitClass();
 
  //Get the current list of transfer function stored in the state
  static void get(SoState* state, TransferFunctionMap& tfMap);

  static bool idEqual(SoTransferFunction* tf, short id);

  static int getMinTransferFunctionId(SoState* state);
  static int getMaxTransferFunctionId(SoState* state);

  static SoTransferFunction* get(SoState* state, int transferFunctionId);
 
private:
  //List of transfer function.
  //Each transfer function is stored at tf->transferFunctionId entry in this array
  //If transferFunctionId are different, transfer functions are accumulated else replaced
  TransferFunctionMap m_transferFunctionList;
 
  SoTransferFunction *m_transferFunctionNode;
  int m_minTfId;
  int m_maxTfId;
 
  virtual void setElt( SoTransferFunction *m_transferFunctionNode );
 
  virtual ~SoTransferFunctionElement() ;
};
 
#ifdef _MSC_VER
#pragma warning( pop )
#endif
 
#endif // _SO_TRANSFER_FUNCTION_ELEMENT_