SbSphereProjector.h

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**=======================================================================*/
/*=======================================================================
** Author      : Howard Look (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef _SB_SPHERE_PROJECTOR_
#define _SB_SPHERE_PROJECTOR_
 
#include <Inventor/projectors/SbProjector.h>
 
class  SbSphereProjector : public SbProjector
{
 public:
 
  virtual SbVec3f     project(const SbVec2f &point) = 0;
  virtual SbVec3f intersect( const SbLine &line ) = 0;
 
  SbVec3f             projectAndGetRotation(const SbVec2f &point,
                                            SbRotation &rot);
 
  virtual SbRotation  getRotation(const SbVec3f &point1,
                                  const SbVec3f &point2) = 0;
 
  void                setSphere(const SbSphere &sph);
 
  const SbSphere &    getSphere() const                 { return sphere; }
 
  void                setOrientToEye(SbBool orientToEye);
  SbBool              isOrientToEye() const           { return orientToEye; }
 
  void                setFront(SbBool inFront);
  SbBool              isFront()       const   { return intersectFront; }
  SbBool              isPointInFront( const SbVec3f &point ) const;
  virtual void            setWorkingSpace(const SbMatrix &space);
 
  virtual ~SbSphereProjector() {};
    
 private:
  // Constructors
  // The default sphere to use has a radius of 1.0 and is centered at (0,0,0).
  SbSphereProjector(SbBool orientToEye);
  SbSphereProjector(const SbSphere &s, SbBool orientToEye);
 
  // Are intersections done on the front half (if not, they're done on
  // the back half) of the sphere?
  SbBool      intersectFront;
 
  // Just like sphere::intersect, except always returns
  // the intersection that is in "front".
  SbBool      intersectSphereFront(const SbLine &l, SbVec3f &result);
 
  SbSphere    sphere;                 // The sphere being used.
  SbBool      orientToEye;            // TRUE if always oriented to eye.
  SbBool      needSetup;              // Set TRUE whenever sphere, work space
  // or orientation changes.
 
  // cached last point on this projector
  SbVec3f     lastPoint;
 
};
 
#endif /* _SB_SPHERE_PROJECTOR_ */