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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 SbProjector. These take
| a point in two dimensions and project it to a point in three
| dimensions. Typically, the point is the mouse position.
|
| SbProjectors are typically used by manipulators to turn the
| mouse position into a rotation or translation.
|
| 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_PROJECTOR_
#define _SB_PROJECTOR_
#include <Inventor/SbLinear.h>
// C-api: prefix=SbProj
class 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.
// C-api: expose
virtual SbVec3f project(const SbVec2f &point) = 0;
// Set/get the view volume to use for the projection.
// This is typically gotten from SbCamera::getViewVolume.
// C-api: expose
// C-api: name=setViewVol
virtual void setViewVolume(const SbViewVolume &vol);
// C-api: name=getViewVol
const SbViewVolume & getViewVolume() const { return viewVol; }
// Set/get the transform space to work in. This matrix should transform
// working space coords into world space.
// The default matrix is identity, meaning that the default working
// space is world space.
// C-api: expose
// C-api: name=setWorkSpace
virtual void setWorkingSpace(const SbMatrix &space);
// C-api: name=getWorkSpace
const SbMatrix & getWorkingSpace() const
{ return workingToWorld ; }
// Returns an instance that is a copy of this instance. The caller
// is responsible for deleting the copy when done.
virtual SbProjector * copy() const = 0;
protected:
// Default constructor.
// The default view volume is undefined.
// The default working space is identity (world space).
SbProjector();
~SbProjector(){};
// Given this mouse point, return the line it projects to
// in working space.
SbLine getWorkingLine(const SbVec2f &point) const;
SbViewVolume viewVol;
SbMatrix worldToWorking;
SbMatrix workingToWorld;
};
#endif /* _SB_PROJECTOR_ */
|
