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/*
* angle_units.h -- Implementation of ePiX's angular units
*
* This file is part of ePiX, a C++ library for creating high-quality
* figures in LaTeX
*
* Version 1.1.22
* Last Change: September 24, 2007
*/
/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
* Andrew D. Hwang <rot 13 nujnat at zngupf dot ubylpebff dot rqh>
* Department of Mathematics and Computer Science
* College of the Holy Cross
* Worcester, MA, 01610-2395, USA
*/
/*
* ePiX is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* ePiX 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 General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ePiX; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This file contains:
*
* [] angle_state
* Angular mode (radians, degrees, revolutions)
*
* The class in this file implements backend for user-level global
* functions defined in state.h. This header is not part of epix.h.
*/
#ifndef EPIX_ANGLE_UNITS
#define EPIX_ANGLE_UNITS
#include <cmath>
namespace ePiX {
class angle_state {
public:
angle_state();
void set_radians_mode();
void set_degrees_mode();
void set_revolutions_mode();
// convert to radians, for angle-sensitive trig functions
double to_radians(double t);
// current angle units to/from degrees, for label_style
double to_degrees(double t);
double from_degrees(double t);
private:
// store state redundantly; small overhead, saves conversion
double m_rad_per_unit;
double m_unit_per_deg;
double m_rev_per_unit;
}; // end of class angle_state
angle_state& the_angle_style();
} // end of namespace
#endif /* EPIX_ANGLE_UNITS */
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