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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 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/engines/SoSubEngine.h>
#include <Inventor/fields/SoSFBool.h>
#include <Inventor/fields/SoSFFloat.h>
#include <Inventor/fields/SoSFTime.h>
#include <Inventor/fields/SoSFTrigger.h>
// C-api: public=timeIn,speed,on,pause,reset
// C-api: public=timeOut
class SoElapsedTime : public SoEngine {
SO_ENGINE_HEADER(SoElapsedTime);
public:
// Inputs
SoSFTime timeIn; // Running (clock) time
SoSFFloat speed; // Scale factor for time
SoSFBool on; // TRUE to run, FALSE to stop
SoSFBool pause; // TRUE to freeze, FALSE to run
SoSFTrigger reset;
// Output:
//
// While the engine is on, it keeps track of 'clock' time.
// This is the amount of real time that passes multiplied by the speed.
// If the speed input varies while the engine is on, then 'clock' time
// advances non-uniformly.
//
// Pausing the engine will freeze the timeOut value, but internally the
// 'clock' time will continue to advance.
// Unpause the engine and the timeOut will jump forward to display
// 'clock' time.
//
// Stop the engine (by setting 'on' to FALSE) to freeze both the
// timeOut value and the 'clock' time. Re-start (by setting 'on'
// to TRUE) and both timeOut and 'clock' will continue from where
// they were at the time the engine was stopped.
//
SoEngineOutput timeOut;
// Constructor
SoElapsedTime();
SoINTERNAL public:
static void initClass();
protected:
// Detects when the running time input changed
virtual void inputChanged(SoField *whichInput);
// Writes instance to SoOutput. Takes care of not writing out
// connection to realTime that is created in constructor.
virtual void writeInstance(SoOutput *out);
// 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);
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.
// Destructor
~SoElapsedTime();
// Evaluation method
virtual void evaluate();
};
#endif /* _SO_ELAPSED_TIME_ */
|
