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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/
*
*/
// -*- C++ -*-
/*
* 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>
// C-api: prefix=SbSphSheetProj
class SbSphereSheetProjector : public SbSphereProjector
{
public:
// Default constructor.
// The default view volume is undefined.
// The default working space is identity (world space).
// The default sphere to use has a radius of 1.0 and is centered at (0,0,0).
// The default eye orientation is TRUE.
SbSphereSheetProjector(SbBool orientToEye = TRUE);
// Constructor taking the sphere.
// C-api: name=createSph
SbSphereSheetProjector(const SbSphere &sph,
SbBool orientToEye = TRUE);
// Destructor
~SbSphereSheetProjector() {}
// Returns an instance that is a copy of this instance. The caller
// is responsible for deleting the copy when done.
virtual SbProjector * copy() const;
// Apply the projector using the given point, returning the
// point in three dimensions that it projects to.
// The point should be normalized from 0-1, with (0,0) at the lower-left.
virtual SbVec3f project(const SbVec2f &point);
// Computes a rotation based on two points on this projector.
virtual SbRotation getRotation(const SbVec3f &point1,
const SbVec3f &point2);
protected:
// Sets up the plane use to project on to.
void setupPlane();
// The projection point in working space.
SbVec3f workingProjPoint;
// Information about the plane used for intersection testing.
SbVec3f planePoint; // point on plane
SbVec3f planeDir; // normal direction
float planeDist; // distance from sphere center
SbPlane tolPlane; // the plane itself
};
#endif /* _SB_SPHERE_SHEET_PROJECTOR_ */
|
