SoGetMatrixAction.h

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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_GET_MATRIX_ACTION_
#define  _SO_GET_MATRIX_ACTION_
 
#include <Inventor/SbLinear.h>
#include <Inventor/actions/SoSubAction.h>
#include <Inventor/SbViewportRegion.h>
 
//
//  Class: SoGetMatrixAction
//
//  For computing a cumulative transformation matrix and its inverse,
//  along with a cumulative texture transformation matrix and its inverse.
//
//  This action is unlike most others in that it does not traverse
//  downwards. When called on a node, it computes the matrix for just
//  that node. (This makes sense for transformation nodes, but not for
//  others, really.) When called on a path, it gathers the
//  transformation info for all nodes in the path and those that
//  affect nodes in the path, but it stops when it hits the last node
//  in the path; it does not traverse downwards from it as other
//  actions (such as rendering) do. This behavior makes the most sense
//  for this action.
//
//  EXTENDERS:  The model and texture matrix elements are not enabled
//  for this action.  Your transformation nodes must use the
//  getMatrix/getInverse calls and directly modify the matrices stored
//  in the action.
//
 
class  SoGetMatrixAction : public SoAction {
 
  SO_ACTION_HEADER(SoGetMatrixAction);
 
 public:
  SoGetMatrixAction(const SbViewportRegion &newRegion);
 
  // Destructor
#ifndef HIDDEN_FROM_DOC
  virtual ~SoGetMatrixAction();
#endif // HIDDEN_FROM_DOC
 
  void                setViewportRegion(const SbViewportRegion &newRegion);
 
  const SbViewportRegion &getViewportRegion() const   { return vpRegion; }
 
  SbMatrix &          getMatrix()             { return ctm; }
  SbMatrix &          getInverse()            { return inv; }
 
  SbMatrix &          getTextureMatrix()      { return texCtm; }
  SbMatrix &          getTextureInverse()     { return texInv; }
 
 private:
  static void         initClass();
  static void         exitClass();
 
 private:
  // Initiates action on graph
  virtual void        beginTraversal(SoNode *node);
 
 private:
  SbMatrix            ctm;            // Cumulative transformation matrix
  SbMatrix            inv;            // Inverse transformation matrix
  SbMatrix            texCtm;         // Cumulative texture transf matrix
  SbMatrix            texInv;         // Inverse texture transf matrix
  SbViewportRegion    vpRegion;       // Current viewport region
 
};
 
#endif /* _SO_GET_MATRIX_ACTION_ */