SoElapsedTime.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 contains the implementation of the ElapsedTime engine
 |
 |   Classes:
 |      SoElapsedTime
 |
 |   Author(s)          : Gavin Bell
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
 
#ifndef  _SO_ELAPSED_TIME_
#define  _SO_ELAPSED_TIME_
 
#include <Inventor/system/SbSystem.h>
#include <Inventor/engines/SoSubEngine.h>
#include <Inventor/fields/SoSFBool.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/fields/SoSFTime.h>
#include <Inventor/fields/SoSFTrigger.h>


 
class INVENTOR_API SoElapsedTime : public SoEngine {
 
    SO_ENGINE_HEADER(SoElapsedTime);
 
  public:


    SoSFTime            timeIn;         

    SoSFFloat           speed;          

    SoSFBool            on;             

    SoSFBool            pause;          

    SoSFTrigger         reset;


    SoEngineOutput      timeOut;

    SoElapsedTime();
 
  SoINTERNAL public:
 
    static void initClass();
 
  protected:

    virtual void        inputChanged(SoField *whichInput);

    virtual void        writeInstance(SoOutput *out);

    virtual bool        readInstance(SoInput *in, unsigned short flags);
 
  private:
    enum Todo {
        CHECK_ON        = (1<<0),
        CHECK_PAUSE     = (1<<1),
        RESET           = (1<<2)
    };
    enum State {
        STOPPED,        
        RUNNING,        
        PAUSED          
    };
 
    enum State          state;
    unsigned int        todo;
    SbTime              prevTimeOfDay;   
    SbTime              prevTimeOut;     
    float               prevClockTime;   

    ~SoElapsedTime();

    virtual void        evaluate();
};
 
#endif  /* _SO_ELAPSED_TIME_ */