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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*************************************************************************
** Length.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program 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 3 of **
** the License, or (at your option) any later version. **
** **
** This program 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 this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#ifndef LENGTH_HPP
#define LENGTH_HPP
#include <map>
#include <vector>
#include "MessageException.hpp"
#ifdef IN
#undef IN
#endif
struct UnitException : MessageException {
explicit UnitException (const std::string &msg) : MessageException(msg) {}
};
class Length {
public:
enum class Unit {PT, BP, CM, MM, IN, PC, DD, CC, SP};
public:
constexpr Length () =default;
explicit constexpr Length (long double pt) : _pt(static_cast<double>(pt)) {}
Length (double val, Unit unit) {set(val, unit);}
Length (double val, const std::string &unitstr) {set(val, unitstr);}
explicit Length (const std::string &lenstr) {set(lenstr);}
void set (double val, Unit unit);
void set (double val, std::string unit);
void set (const std::string &lenstr);
double pt () const {return _pt;}
double in () const {return _pt*pt2in;}
double bp () const {return _pt*pt2bp;}
double cm () const {return _pt*pt2cm;}
double mm () const {return _pt*pt2mm;}
double pc () const {return _pt*pt2pc;}
double dd () const {return _pt*pt2dd;}
double cc () const {return _pt*pt2cc;}
double sp () const {return _pt*pt2sp;}
double get (Unit unit) const;
std::string toString (Unit unit) const;
bool operator == (Length len) const {return _pt == len._pt;}
bool operator != (Length len) const {return _pt != len._pt;}
static Unit stringToUnit (const std::string &unitstr);
static std::string unitToString (Unit unit);
static std::map<std::string,Unit> getUnits ();
public:
static constexpr double pt2in = 1.0/72.27;
static constexpr double pt2bp = pt2in*72;
static constexpr double pt2cm = pt2in*2.54;
static constexpr double pt2mm = pt2cm*10;
static constexpr double pt2pc = 1.0/12;
static constexpr double pt2dd = 1157.0/1238;
static constexpr double pt2cc = pt2dd/12;
static constexpr double pt2sp = 65536.0;
private:
double _pt=0; // length in TeX point units (72.27pt = 1in)
};
constexpr Length operator "" _pt (long double pt) {return Length(pt);}
constexpr Length operator "" _bp (long double bp) {return Length(bp/Length::pt2bp);}
constexpr Length operator "" _mm (long double mm) {return Length(mm/Length::pt2mm);}
constexpr Length operator "" _in (long double in) {return Length(in/Length::pt2in);}
constexpr Length operator "" _pt (unsigned long long pt) {return Length(static_cast<double>(pt));}
constexpr Length operator "" _bp (unsigned long long bp) {return Length(static_cast<double>(bp)/Length::pt2bp);}
constexpr Length operator "" _mm (unsigned long long mm) {return Length(static_cast<double>(mm)/Length::pt2mm);}
constexpr Length operator "" _in (unsigned long long in) {return Length(static_cast<double>(in)/Length::pt2in);}
#endif
|
