Trackball.h

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/*
 *  $Id: trackball.h
 *  hog2
 *
 *  Created by ggs 12/06/02.
 *  Modified by Nathan Sturtevant on 02/29/20.
 *
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#ifndef __trackball_h__
#define __trackball_h__
 
#ifdef __cplusplus
extern "C" {
#endif
 
// called with the start position and the window origin + size
void startTrackball (long x, long y, long originX, long originY, long width, long height);
 
// calculated rotation based on current mouse position
void rollToTrackball (long x, long y, float rot [4]); // rot is output rotation angle
 
// add a GL rotation (dA) to an existing GL rotation (A)
void addToRotationTrackball (float * dA, float * A);
 
#ifdef __cplusplus
}
#endif
 
#endif