SbSphereSheetProjector.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 defines the SbSphereSheetProjector class. This is a
 |      sphere with a hyperbolic sheet draped over it. As the
 |      mouse moves away from the sphere, rotation gradually
 |      turns into pure roll.
 |
 |      This projector is good for trackballs that want to do
 |      constinuous roll. It allows pure roll as you move away
 |      from the sphere. (This projector uses the same paradigm 
 |      as the "Flip" demo.)
 |
 |      Warning: This projector tends to become unstable when
 |      the mouse position is beyond about 2*radius from the
 |      center of the sphere. Therefore, it is best to use this
 |      as a large, window-sized trackball.
 |
 |   Author(s)          : Howard Look, Gavin Bell, Paul Isaacs
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
 
#ifndef _SB_SPHERE_SHEET_PROJECTOR_
#define _SB_SPHERE_SHEET_PROJECTOR_
 
#include <Inventor/projectors/SbSphereProjector.h>
 
 
 
class INVENTOR_API SbSphereSheetProjector : public SbSphereProjector
{
  public:
 
    SbSphereSheetProjector(bool orientToEye = TRUE);
 
    SbSphereSheetProjector(const SbSphere &sph,
                           bool orientToEye = TRUE);
 
    ~SbSphereSheetProjector() {}
    
    virtual SbProjector *    copy() const;
 
    virtual SbVec3f     project(const SbVec2f &point);
 
    virtual SbRotation  getRotation(const SbVec3f &point1,
                                    const SbVec3f &point2);
 
  protected:
    void                setupPlane();
 
    SbVec3f             workingProjPoint;
    
    SbVec3f     planePoint;             
    SbVec3f     planeDir;               
    float       planeDist;              
    SbPlane     tolPlane;               
};
 
#endif /* _SB_SPHERE_SHEET_PROJECTOR_ */