diff options
author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /graphics/epix/angle_units.cc |
Initial commit
Diffstat (limited to 'graphics/epix/angle_units.cc')
-rw-r--r-- | graphics/epix/angle_units.cc | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/graphics/epix/angle_units.cc b/graphics/epix/angle_units.cc new file mode 100644 index 0000000000..cbc8973703 --- /dev/null +++ b/graphics/epix/angle_units.cc @@ -0,0 +1,94 @@ +/* + * angle_units.cc -- 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 + */ + +#include "constants.h" +#include "angle_units.h" + +namespace ePiX { + + angle_state::angle_state() + : m_rad_per_unit(1.0), + m_unit_per_deg(PI_180), + m_rev_per_unit(1.0/TWO_PI) { } + + void angle_state::set_radians_mode() + { + m_rad_per_unit = 1.0; + m_unit_per_deg = PI_180; + m_rev_per_unit = 1.0/TWO_PI; + } + + void angle_state::set_degrees_mode() + { + m_rad_per_unit = PI_180; + m_unit_per_deg = 1.0; + m_rev_per_unit = 1.0/360; + } + + void angle_state::set_revolutions_mode() + { + m_rad_per_unit = TWO_PI; + m_unit_per_deg = 1.0/360; + m_rev_per_unit = 1.0; + } + + + double angle_state::to_radians(double t) + { + return t *= m_rad_per_unit; + } + + // result lies in (-180, 180] + double angle_state::to_degrees(double t) + { + t *= m_rev_per_unit; + + t -= 0.5; // shift half a turn + t -= ceil(t); // map to (-1,0] + t += 0.5; // shift to (-0.5, 0.5] + + return t *= 360.0; + } + + double angle_state::from_degrees(double t) + { + return t *= m_unit_per_deg; + } + + angle_state& the_angle_style() + { + static angle_state* the_angle_state(new angle_state()); + return *the_angle_state; + } +} // end of namespace |