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

/*
 * Copyright 1993, 1994, 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
 */


/*
 * pfiTrackball.h
 *
 * $Revision: 1.1 $
 * $Date: 2000/11/21 21:39:35 $
 *
 */

#ifndef __TRACKBALL_H__
#define __TRACKBALL_H__

#include <Performer/pfui.h>
#include <Performer/pfui/pfiInputXform.h>

#if PF_CPLUSPLUS_API

class pfiInputXformTrackball : public pfiInputXform
{
  private:
    static pfType *classType;
  public:
    float		xSpeedScale, xDBSize; /* multipliers for start speed */
    float		xAccelRate;	    /* extra acceleration/deceleration multiplier */
    float		xPrevDeltaX, xPrevDeltaY;
    pfVec3		xTranslation; // accumulate translation
    pfMatrix		xSpinMat; // accumulated rotations
    pfMatrix		xPosMat; // object positioning matrix
    pfMatrix		xHPRMat, xHPRInvMat; 
    short		xSpin;	    /* booleans */
  public:	/* constructor/destructors */
    pfiInputXformTrackball(void);
  public:	/****** type *****/
    static void	   init();
    static pfType* getClassType() { return classType; }
    virtual const char*	getTypeName(void) const { return "pfiInputXformTrackball"; }
  public:	/* sets/gets */
    virtual void	_setBSphere(pfSphere* _sphere);
    virtual void	setMotionLimits(float _maxSpeed, float _angularVel, float _accel);
    void		setCoord(pfCoord *_coord);
    void		setMat(pfMatrix& _mat);
    virtual void	getMat(pfMatrix& _mat);
    
    void		setAccelRate(float _m) { xAccelRate = _m; }
    float		getAccelRate(void) { return xAccelRate; }
  public:	/* generic interface */
    virtual void	setFocus(int _focus);
    virtual void	setMode(int _mode, int _val);
    virtual int		getMode(int _mode) const;
    virtual void	reset(void);
    virtual void	resetPosition(void);
    virtual void	resetRotation(void);
    virtual void	stop(void);
};

#endif /* PF_CPLUSPLUS_API */

#endif /* __TRACKBALL_H__ */