SbSphereSectionProjector.h

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/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */
 
 
/*
 * Copyright (C) 1990,91,92   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.1.1.1 $
 |
 |   Description:
 |      This file contains the definition of the SbSphereSectionProjector
 |      class. This projector projects the mouse position onto the 
 |      section of a sphere that has been sliced by a plane.
 |
 |      The tolerance slice can be specified as a fraction of the radius
 |      of the sphere. The projection point will not extend beyond
 |      the sliced portion of the sphere.
 |
 |      This projector is good for trackballs that only do
 |      pure roll when the mouse is off the sliced portion of
 |      the sphere.
 |        
 |   Author(s)          : Howard Look, Paul Isaacs
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
 
#ifndef _SB_SPHERE_SECTION_PROJECTOR_
#define _SB_SPHERE_SECTION_PROJECTOR_
 
#include <Inventor/projectors/SbSphereProjector.h>


 
class INVENTOR_API SbSphereSectionProjector : public SbSphereProjector
{
  public:
    SbSphereSectionProjector(float  edgeTol = .9,
                             bool orientToEye = TRUE);

    SbSphereSectionProjector(const SbSphere &sph,
                             float edgeTol = .9, 
                             bool orientToEye = TRUE);

    ~SbSphereSectionProjector() {}
    
    virtual SbProjector *    copy() const;

    virtual SbVec3f     project(const SbVec2f &point);

    virtual SbRotation  getRotation(const SbVec3f &point1,
                                    const SbVec3f &point2);

    void                setTolerance(float edgeTol);

    float               getTolerance() const              { return tolerance; }

    void                setRadialFactor(float rad = 0.0) { radialFactor = rad;}
    float               getRadialFactor() const  { return radialFactor; }

    bool                isWithinTolerance(const SbVec3f &point);
    
  protected:
  
    virtual void        setupTolerance();

    float               tolerance;  
    float               tolDist;    
 
    float               radialFactor;
    
    SbVec3f     planePoint;             
    SbVec3f     planeDir;               
    float       planeDist;              
    SbPlane     tolPlane;               
};
 
#endif /* _SB_SPHERE_SECTION_PROJECTOR_ */