1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*
* 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 <ahwang -at- holycross -dot- edu>
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 */
|
