SoElapsedTime.h

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**=======================================================================*/
/*=======================================================================
** Author      : Gavin Bell (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_ELAPSED_TIME_
#define  _SO_ELAPSED_TIME_
 
#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  SoElapsedTime : public SoEngine {
 
  SO_ENGINE_HEADER(SoElapsedTime);
 
 public:
  SoSFTime            timeIn;
  SoSFFloat           speed;
  SoSFBool            on;
  SoSFBool            pause;
  SoSFTrigger         reset;
 
  SoEngineOutput      timeOut;
 
  SoElapsedTime();
 
 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:
 
  // Detects when the running time input changed
  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
  ~SoElapsedTime();
 private:
  enum Todo {
    CHECK_ON        = (1<<0),
    CHECK_PAUSE     = (1<<1),
    RESET           = (1<<2)
  };
  enum State {
    STOPPED,        // Clock is not running
    RUNNING,        // Clock is running
    PAUSED          // Clock is running, but output is frozen
  };
 
  enum State          state;
  unsigned int        todo;
  SbTime              prevTimeOfDay;   // Time of day when last
  // evaluate was called.
  SbTime              prevTimeOut;     // Last 'clock' time that 
  // was output.
  float               prevClockTime;   // 'Clock' time when last 
  // evaluate was called.
 
};
 
#endif  /* _SO_ELAPSED_TIME_ */