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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /graphics/epix/angle_units.cc
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+/*
+ * 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