CartesianClippingNode.cc

/*===========================================================================*\
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/*===========================================================================*\
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 *   $Revision$                                                       *
 *   $Author$                                                      *
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\*===========================================================================*/




//=============================================================================

#include "CartesianClippingNode.hh"

//=============================================================================

namespace ACG {
namespace SceneGraph {

//=============================================================================


CartesianClippingNode::CartesianClippingNode( BaseNode*           _parent,
                                              const std::string&  _name )
  : BaseNode( _parent, _name )
{
  set_cursor( Vec3f( 0, 0, 0 ) );
  enabled_ = NONE;
}

//-----------------------------------------------------------------------------


void
CartesianClippingNode::enter( GLState & _state, const DrawModes::DrawMode& /* _drawmode */ )
{
  Vec3d eye = _state.eye();

  if ( is_enabled( XY_PLANE ) )
  {
    GLdouble xy_plane[4];  
    if ( eye[2] > 0 )
    {  
      xy_plane[0] = 0;
      xy_plane[1] = 0;
      xy_plane[2] = -1;
      xy_plane[3] = cursor_[2];
    }
    else
    {
      xy_plane[0] = 0;
      xy_plane[1] = 0;
      xy_plane[2] = 1;
      xy_plane[3] = -cursor_[2];
    }
    
    glClipPlane( GL_CLIP_PLANE0, xy_plane );
    ACG::GLState::enable( GL_CLIP_PLANE0 );
  }

  if ( is_enabled( YZ_PLANE ) )
  {
    GLdouble yz_plane[4];  
    if ( eye[0] > 0 )
    {  
      yz_plane[0] = -1;
      yz_plane[1] = 0;
      yz_plane[2] = 0;
      yz_plane[3] = cursor_[0];
    }
    else
    {
      yz_plane[0] = 1;
      yz_plane[1] = 0;
      yz_plane[2] = 0;
      yz_plane[3] = -cursor_[0];
    }
    
    glClipPlane( GL_CLIP_PLANE1, yz_plane );
    ACG::GLState::enable( GL_CLIP_PLANE1 );
  }

  if ( is_enabled( XZ_PLANE ) )
  {
    GLdouble xz_plane[4];  
    if ( eye[1] > 0 )
    {  
      xz_plane[0] = 0;
      xz_plane[1] = -1;
      xz_plane[2] = 0;
      xz_plane[3] = cursor_[1];
    }
    else
    {
      xz_plane[0] = 0;
      xz_plane[1] = 1;
      xz_plane[2] = 0;
      xz_plane[3] = -cursor_[1];
    }
    
    glClipPlane( GL_CLIP_PLANE2, xz_plane );
    ACG::GLState::enable( GL_CLIP_PLANE2 );
  }


  
}


//-----------------------------------------------------------------------------


void
CartesianClippingNode::leave( GLState & /* _state */ , const DrawModes::DrawMode& /* _drawmode */ )
{
  ACG::GLState::disable( GL_CLIP_PLANE0 );
  ACG::GLState::disable( GL_CLIP_PLANE1 );
  ACG::GLState::disable( GL_CLIP_PLANE2 );
}


//-----------------------------------------------------------------------------


void
CartesianClippingNode::set_cursor( const Vec3f & _cursor )
{
  cursor_ = _cursor;
  
}


//-----------------------------------------------------------------------------


const
Vec3f &
CartesianClippingNode::cursor() const
{
  return cursor_;
}


//-----------------------------------------------------------------------------


void
CartesianClippingNode::set_enabled( Plane _plane ) 
{
  enabled_ = _plane;
}


//-----------------------------------------------------------------------------


bool
CartesianClippingNode::is_enabled( Plane _plane ) const
{
  return ( enabled_ == _plane );
}


//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================