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#define __SIMPLETRACKBALL_H__
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#define __SIMPLETRACKBALL_H__
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#include "CGLA/CGLA.h"
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#include "CGLA/CGLA.h"
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#include "CGLA/Vec3f.h"
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#include "CGLA/Vec3f.h"
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namespace Graphics
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namespace Graphics
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{
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{
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/** Simple trackball class. Use it to let the mouse movement control
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/** \brief Simple trackball class.
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		the viewing transformation.
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    Use it to let the mouse movement control the viewing transformation.
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		Typical usage:
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		Typical usage:
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		Construct the trackball as a global variable. Call the roll function
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		Construct the trackball as a global variable. Call the roll function
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		from the GLUT mouse motion callback. Setup an idle callback which only
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		from the GLUT mouse motion callback. Setup an idle callback which only
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		calls glutPostRedisplay and call gl_view from the display function to
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		calls glutPostRedisplay and call gl_view from the display function to