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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 TimeCounter engine
|
| Classes:
| SoTimeCounter
|
| Author(s) : Ronen Barzel
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#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>
// C-api: public=min,max,step,on,frequency,duty,timeIn,syncIn,reset
// C-api: public=output,syncOut
class SoTimeCounter : public SoEngine {
SO_ENGINE_HEADER(SoTimeCounter);
public:
// Inputs
SoSFShort min; // min value for counter (default 0)
SoSFShort max; // max value for counter (default 1)
SoSFShort step; // value to step by (default 1)
SoSFBool on; // counter pauses while this is FALSE
SoSFFloat frequency; // cycles-per-second
SoMFFloat duty; // duty-cycle array
SoSFTime timeIn; // time source (else internal is used)
SoSFTrigger syncIn; // restart cycle
SoSFShort reset; // reset cycle to value at setValue
// Outputs
SoEngineOutput output; // (SoSFShort) counts min...max
SoEngineOutput syncOut; // (SoSFTrigger) triggers at cycle start
// Constructor
SoTimeCounter();
SoINTERNAL public:
static void initClass();
protected:
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 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
// Destructor
~SoTimeCounter();
// Evaluation method
virtual void evaluate();
};
#endif /* _SO_TIME_COUNTER_ */
|
