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Initial check-in based on OpenGL Performer 2.4 tree.
-flynnt

/*
 * Copyright 1995, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
 *
 * This source code ("Source Code") was originally derived from a
 * code base owned by Silicon Graphics, Inc. ("SGI")
 * 
 * LICENSE: SGI grants the user ("Licensee") permission to reproduce,
 * distribute, and create derivative works from this Source Code,
 * provided that: (1) the user reproduces this entire notice within
 * both source and binary format redistributions and any accompanying
 * materials such as documentation in printed or electronic format;
 * (2) the Source Code is not to be used, or ported or modified for
 * use, except in conjunction with OpenGL Performer; and (3) the
 * names of Silicon Graphics, Inc.  and SGI may not be used in any
 * advertising or publicity relating to the Source Code without the
 * prior written permission of SGI.  No further license or permission
 * may be inferred or deemed or construed to exist with regard to the
 * Source Code or the code base of which it forms a part. All rights
 * not expressly granted are reserved.
 * 
 * This Source Code is provided to Licensee AS IS, without any
 * warranty of any kind, either express, implied, or statutory,
 * including, but not limited to, any warranty that the Source Code
 * will conform to specifications, any implied warranties of
 * merchantability, fitness for a particular purpose, and freedom
 * from infringement, and any warranty that the documentation will
 * conform to the program, or any warranty that the Source Code will
 * be error free.
 * 
 * IN NO EVENT WILL SGI BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT
 * LIMITED TO DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES,
 * ARISING OUT OF, RESULTING FROM, OR IN ANY WAY CONNECTED WITH THE
 * SOURCE CODE, WHETHER OR NOT BASED UPON WARRANTY, CONTRACT, TORT OR
 * OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM,
 * OR AROSE OUT OF USE OR RESULTS FROM USE OF, OR LACK OF ABILITY TO
 * USE, THE SOURCE CODE.
 * 
 * Contact information:  Silicon Graphics, Inc., 
 * 1600 Amphitheatre Pkwy, Mountain View, CA  94043, 
 * or:  http://www.sgi.com
 */

//
// Rotor.C:   Subclass of DCS for emulating Inventor SoRotor
//
// $Revision: 1.1 $
// $Date: 2000/11/21 21:39:33 $
//

#include "Rotor.h"

pfType *Rotor::classType = NULL;

void
Rotor::init()
{
    if (classType == NULL)
    {
	pfDCS::init();
	classType = 
	    new pfType(pfDCS::getClassType(), "Rotor");
    }
}


Rotor::Rotor()
{
    setType(classType);

    enable = FALSE;
    frequency= 0.0f;
    axis.set(1.0f, 0.0f, 0.0f);
    prevAngle= 0.0f;
    prevTime= 0.0f;
}

Rotor::~Rotor()
{
}

int 
Rotor::app(pfTraverser *trav)
{
    if (enable)
    {
	pfMatrix mat;
	double now = pfGetFrameTimeStamp();

	// use delta and renorm it to prevent jitters for large times
	prevAngle += (now - prevTime)*360.0f*frequency;
	if (prevAngle > 360.0f)
	    prevAngle -= 360.0f;
	mat.makeRot(prevAngle, axis[0], axis[1], axis[2]);
	setMat(mat);
	prevTime = now;
    }

    return pfDCS::app(trav);
}