SoAntiSquish.h

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**=======================================================================*/
/*=======================================================================
** Author      : Paul Isaacs (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_ANTI_SQUISH_
#define  _SO_ANTI_SQUISH_
 
#include <Inventor/fields/SoFieldData.h>
#include <Inventor/nodes/SoNode.h>
#include <Inventor/nodes/SoTransformation.h>
#include <Inventor/fields/SoSFBool.h>
#include <Inventor/fields/SoSFEnum.h>
 
//
//  Class: SoAntiSquish
//
//  undoes any uneven scales in the current transformation matrix.
//  during traversal
//
 
class  SoAntiSquish : public SoTransformation {
 
  SO_NODE_HEADER(SoAntiSquish);
 
 public:
 
  SoAntiSquish();
 
  enum Sizing {
    X,
    Y,
    Z,
    AVERAGE_DIMENSION,
    BIGGEST_DIMENSION,
    SMALLEST_DIMENSION,
    LONGEST_DIAGONAL
  };
 
  // Fields
  SoSFEnum                sizing;
  SoSFBool                recalcAlways;
 
  void recalc();
 
 private:
  virtual void        callback(SoCallbackAction *action);
  virtual void        GLRender(SoGLRenderAction *action);
  virtual void        getBoundingBox(SoGetBoundingBoxAction *action);
  virtual void        getMatrix(SoGetMatrixAction *action);
  virtual void        pick(SoPickAction *action);
  
  // Called by actions that need to change the state with a new matrix.
  void                doAction(SoAction *action);
 
 private:
  static void         initClass();
  static void         exitClass();
 
 private:
  virtual ~SoAntiSquish();
 
  SbMatrix getUnsquishingMatrix( SbMatrix squishedMatrix, SbBool doInverse,
                                 SbMatrix &inverseAnswer );
 
 private:
  SbMatrix savedAnswer, savedInverseAnswer;
 
  SbBool recalcNextTime;
};
 
#endif /* _SO_ANTI_SQUISH_ */