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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 implementation of the
| SoComputeBoundingBox engine
|
| Classes:
| SoComputeBoundingBox
|
| Author(s) : Paul S. Strauss
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SO_COMPUTE_BOUNDING_BOX_
#define _SO_COMPUTE_BOUNDING_BOX_
#include <Inventor/SbViewportRegion.h>
#include <Inventor/engines/SoSubEngine.h>
#include <Inventor/fields/SoSFPath.h>
#include <Inventor/fields/SoSFNode.h>
#include <Inventor/fields/SoSFVec3f.h>
class SoGetBoundingBoxAction;
/////////////////////////////////////////////////////////////////////////////
//
// Class: SoComputeBoundingBox
//
// This engine has two input fields: "node" (SoSFNode) and "path"
// (SoSFPath). By default, these fields contain NULL pointers. If the
// "path" field is not NULL, this engine computes the bounding box
// and center of the graph defined by the path, using an
// SoGetBoundingBoxAction, and outputs the results. If the "path"
// field is NULL but the "node" field isn't, it computes the bounding
// box and center of the graph rooted by the node.
//
// If both the node and the path are NULL, the outputs are disabled.
//
// The "boxCenter" output is the center of the computed bounding box,
// and the "objectCenter" output is the center defined by the objects
// themselves, as returned by SoGetBoundingBoxAction::getCenter().
//
// The engine uses a default viewport region when constructing the
// SoGetBoundingBoxAction, so screen-based objects (such as 2D text)
// may not be dealt with correctly. If this feature is needed, you
// can call setViewportRegion() on an engine instance to set up the
// correct viewport region to use.
//
/////////////////////////////////////////////////////////////////////////////
// C-api: prefix=SoComputeBBox
// C-api: public=node,path,min,max,boxCenter,objectCenter
class SoComputeBoundingBox : public SoEngine {
SO_ENGINE_HEADER(SoComputeBoundingBox);
public:
// Inputs:
SoSFNode node; // Pointer to root node of graph
SoSFPath path; // Pointer to path defining graph
// Outputs:
SoEngineOutput min; // (SoSFVec3f) Minimum point of bbox
SoEngineOutput max; // (SoSFVec3f) Maximum point of bbox
SoEngineOutput boxCenter; // (SoSFVec3f) Center point of bbox
SoEngineOutput objectCenter; // (SoSFVec3f) Center of object(s)
// Constructor
SoComputeBoundingBox();
// Sets/returns viewport region to use for bounding box computation
// C-api: name=setVPReg
void setViewportRegion(const SbViewportRegion &vpReg);
// C-api: name=getVPReg
const SbViewportRegion &getViewportRegion() const;
SoINTERNAL public:
static void initClass();
protected:
// Indicates that an input has changed - we use this to determine
// whether to use the node or path, or to disable output entirely
virtual void inputChanged(SoField *whichInput);
private:
// Pointer to SoGetBoundingBoxAction
SoGetBoundingBoxAction *bba;
// Each of these is TRUE if the corresponding input pointer is non-NULL
SbBool gotNode;
SbBool gotPath;
// Destructor
virtual ~SoComputeBoundingBox();
// Evaluation method
virtual void evaluate();
};
#endif /* _SO_COMPUTE_BOUNDING_BOX_ */
|
