SoTimeCounter.h

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/*=======================================================================
 * Copyright 1991-1996, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
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 * in Technical Data and Computer Software clause at DFARS 252.227-7013 and/or
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 * Supplement.  Contractor/manufacturer is Silicon Graphics, Inc.,
 * 2011 N. Shoreline Blvd. Mountain View, CA 94039-7311.
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 * THE CONTENT OF THIS WORK CONTAINS CONFIDENTIAL AND PROPRIETARY
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**=======================================================================*/
/*=======================================================================
** Author      : Ronen Barzel (MMM yyyy)
**=======================================================================*/
/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
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 ***                        BORDEAUX, FRANCE                                        ***
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_TIME_COUNTER_
#define  _SO_TIME_COUNTER_
 
#include <Inventor/engines/SoSubEngine.h>
#include <Inventor/fields/SoSFShort.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/fields/SoMFFloat.h>
#include <Inventor/fields/SoSFTime.h>
#include <Inventor/fields/SoSFBool.h>
#include <Inventor/fields/SoSFTrigger.h>
 
class  SoTimeCounter : public SoEngine {
 
  SO_ENGINE_HEADER(SoTimeCounter);
 
 public:
  SoSFShort           min;
  SoSFShort           max;
  SoSFShort           step;
  SoSFBool            on;
  SoSFFloat           frequency;
  SoMFFloat           duty;
  SoSFTime            timeIn;
  SoSFTrigger         syncIn;
  SoSFShort           reset;
 
  SoEngineOutput      output;
  SoEngineOutput      syncOut;
 
  SoTimeCounter();
 
 private:
 
  static void initClass();
  static void exitClass();
 
  // Writes instance to SoOutput. Takes care of not writing out
  // connection to realTime that is created in constructor.
  virtual void        writeInstance(SoOutput *out);
 
 private:
  virtual void        inputChanged(SoField *whichInput);
  
  // Evaluation method
  virtual void        evaluate();
 
  // Reads stuff into instance.  Works around a problem with old
  // files that contain explicit references to the default
  // connection to realTime.
  virtual SbBool      readInstance(SoInput *in, unsigned short flags);
 
  // Destructor
  ~SoTimeCounter();
 private:
  enum State {
    ON,                     // counting
    PAUSED                  // holding
  }                   state;
  enum Todo {
    RECALC  = (1<<0),
    RESET   = (1<<1),
    SYNC    = (1<<2),
    PAUSE   = (1<<3),
    UNPAUSE = (1<<4)
  };
  unsigned int        todo;
  SbTime              period;         // total cycle time
  int                 nStages;
  int                 curStage;
  int                 prevStage;
  struct Stage {
    int     val;            // counter value for stage
    float   duty;           // normalized fraction of cycle
    SbTime  offset;         // time from start of cycle
  }                   *stages;
  SbTime              baseTime;       // Starting time for cycle
  SbTime              pauseOffset;    // Starting time for cycle
};
 
#endif  /* _SO_TIME_COUNTER_ */