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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 contains the definition of the SbSphereProjector
| class. This is an abstract base class for projectors
| that somehow use a sphere in their projection.
|
| Author(s) : Howard Look
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SB_SPHERE_PROJECTOR_
#define _SB_SPHERE_PROJECTOR_
#include <Inventor/projectors/SbProjector.h>
// C-api: abstract
// C-api: prefix=SbSphProj
class SbSphereProjector : public SbProjector
{
public:
// 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) = 0;
// Same as above, but also get a rotation from the last
// projected point to this one.
// C-api: name=projectGetRot
SbVec3f projectAndGetRotation(const SbVec2f &point,
SbRotation &rot);
// Get a rotation given two points on this sphere projector.
// C-api: expose
// C-api: name=getRot
virtual SbRotation getRotation(const SbVec3f &point1,
const SbVec3f &point2) = 0;
// Set/get the sphere to use.
// C-api: name=setSph
void setSphere(const SbSphere &sph);
// C-api: name=getSph
const SbSphere & getSphere() const { return sphere; }
// Set/get whether the projector should always be oriented towards the eye.
// Set to FALSE if the tolerance should be evaluated in working space.
void setOrientToEye(SbBool orientToEye);
SbBool isOrientToEye() const { return orientToEye; }
// Set/get whether the projector should intersect the half of the
// sphere that faces the eye.
// Set to FALSE if the projector should intersect with the rear half.
void setFront(SbBool inFront);
SbBool isFront() const { return intersectFront; }
SbBool isPointInFront( const SbVec3f &point ) const;
// Set the transform space to work in.
virtual void setWorkingSpace(const SbMatrix &space);
// Destructor
~SbSphereProjector(){};
protected:
// Constructors
// The default sphere to use has a radius of 1.0 and is centered at (0,0,0).
SbSphereProjector(SbBool orientToEye);
SbSphereProjector(const SbSphere &s, SbBool orientToEye);
// Are intersections done on the front half (if not, they're done on
// the back half) of the sphere?
SbBool intersectFront;
// Just like sphere::intersect, except always returns
// the intersection that is in "front".
SbBool intersectSphereFront(const SbLine &l, SbVec3f &result);
SbSphere sphere; // The sphere being used.
SbBool orientToEye; // TRUE if always oriented to eye.
SbBool needSetup; // Set TRUE whenever sphere, work space
// or orientation changes.
// cached last point on this projector
SbVec3f lastPoint;
};
#endif /* _SB_SPHERE_PROJECTOR_ */
|
