SbLine.h

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**=======================================================================*/
/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
#ifndef _SB_LINE_
#define _SB_LINE_
 
#include <Inventor/SbBase.h>
#include <Inventor/SbVec.h>
#include <Inventor/SbBox.h>
 
 
//
//  Class: SbLine
//
//  Represents a directed line in 3D space.
//
 
class SbLined;
 
class  SbLine {
public:
  SbLine()  {}
 
  SbLine(const SbVec3f &p0, const SbVec3f &p1);
 
  void    setValue(const SbVec3f &p0, const SbVec3f &p1);
 
  void    setPosDir( const SbVec3f &position, const SbVec3f &direction );
 
  void    setValue( const SbLined& line );
 
  SbBool    getClosestPoints(const SbLine  &line2,
    SbVec3f &ptOnThis,
    SbVec3f &ptOnLine2 ) const;
 
  SbVec3f    getClosestPoint(const SbVec3f &point) const;
 
  inline const SbVec3f &getPosition() const  { return pos; }
 
  inline const SbVec3f &getDirection() const  { return dir; }
 
  static void setIntersectEpsilon(const float epsilon);
 
  private:
 
  SbBool intersect(const SbBox3f &box, SbVec3f &enter, SbVec3f &exit) const;
 
  SbBool intersect(const SbXfBox3f &xbox, SbVec3f &enter, SbVec3f &exit) const;
 
  SbBool intersect(float angle, const SbBox3f &box) const;
 
  SbBool intersect(float angle, const SbVec3f &point) const;
 
  SbBool intersect(float angle, const SbVec3f &v0, const SbVec3f &v1, SbVec3f &pt) const;
 
  SbBool intersect(
    const SbVec3f &v0, const SbVec3f &v1, const SbVec3f &v2, 
    SbVec3f &pt, SbVec3f &barycentric, SbBool &front
    ) const;
 
private:
  // Parametric description:
  //  l(t) = pos + t * dir
  SbVec3f  pos;
  SbVec3f  dir;
};
 
//======================================================================
 
class  SbLined {
public:
  SbLined()  {}
 
  SbLined(const SbVec3d &p0, const SbVec3d &p1);
 
  void    setValue(const SbVec3d &p0, const SbVec3d &p1);
 
  void    setPosDir( const SbVec3d &position, const SbVec3d &direction );
 
  void    setValue( const SbLine& line );
 
  SbBool    getClosestPoints(const SbLined  &line2,
    SbVec3d &ptOnThis,
    SbVec3d &ptOnLine2 ) const;
 
  SbVec3d    getClosestPoint(const SbVec3d &point) const;
 
 
  inline const SbVec3d &getPosition() const  { return pos; }
 
  inline const SbVec3d &getDirection() const  { return dir; }
 
  static void setIntersectEpsilon(const double epsilon);
 
  private:
  // Intersect the line with a box, point, line, and triangle.
  SbBool intersect(const SbBox3d &box,
    SbVec3d &enter, SbVec3d &exit) const;
  SbBool intersect(double angle, const SbBox3d &box) const;
  SbBool intersect(double angle, const SbVec3d &point) const;
  SbBool intersect(double angle, const SbVec3d &v0,
    const SbVec3d &v1, SbVec3d &pt) const;
  SbBool intersect(const SbVec3d &v0,
    const SbVec3d &v1,
    const SbVec3d &v2,
    SbVec3d &pt, SbVec3d &barycentric,
    SbBool &front) const;
    
  SbVec3d getClosestPoint_( const SbVec3d &point, 
    double &projlen ) const;
 
  bool getClosestPoints_( const SbLined &line2,
    SbVec3d &ptOnThis,
    SbVec3d &ptOnLine2,
    double &s,
    double &t) const;
 
private:
  // Parametric description:
  //  l(t) = pos + t * dir
  SbVec3d  pos;
  SbVec3d  dir;
};
 
// Inline methods
 
inline void SbLine::setValue( const SbLined& line )
{
  pos.setValue( line.getPosition() );
  dir.setValue( line.getDirection() );
}
 
inline void SbLined::setValue( const SbLine& line )
{
  pos.setValue( line.getPosition() );
  dir.setValue( line.getDirection() );
}
 
#endif /* _SB_LINE_ */