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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/**
* \file
* \brief Defines the Coord "real" type with sufficient precision for coordinates.
*//*
* Copyright 2006 Nathan Hurst <njh@mail.csse.monash.edu.au>
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
*/
#ifndef LIB2GEOM_SEEN_COORD_H
#define LIB2GEOM_SEEN_COORD_H
#include <cmath>
#include <limits>
#include <boost/operators.hpp>
#include <2geom/forward.h>
namespace Geom {
/** @brief 2D axis enumeration (X or Y). */
enum Dim2 { X=0, Y=1 };
/**
* @brief Floating point type used to store coordinates.
*
* You may safely assume that double (or even float) provides enough precision for storing
* on-canvas points, and hence that double provides enough precision for dot products of
* differences of on-canvas points.
*/
typedef double Coord;
typedef int IntCoord;
const Coord EPSILON = 1e-5; //1e-18;
inline Coord infinity() { return std::numeric_limits<Coord>::infinity(); }
//IMPL: NearConcept
inline bool are_near(Coord a, Coord b, double eps=EPSILON) { return a-b <= eps && a-b >= -eps; }
inline bool rel_error_bound(Coord a, Coord b, double eps=EPSILON) { return a <= eps*b && a >= -eps*b; }
template <typename C>
struct CoordTraits {};
// NOTE: operator helpers for Rect and Interval are defined here.
// This is to avoid increasing their size through multiple inheritance.
template<>
struct CoordTraits<IntCoord> {
typedef IntPoint PointType;
typedef IntInterval IntervalType;
typedef OptIntInterval OptIntervalType;
typedef IntRect RectType;
typedef OptIntRect OptRectType;
typedef
boost::equality_comparable< IntInterval
, boost::additive< IntInterval
, boost::additive< IntInterval, IntCoord
, boost::orable< IntInterval
> > > >
IntervalOps;
typedef
boost::equality_comparable< IntRect
, boost::orable< IntRect
, boost::orable< IntRect, OptIntRect
, boost::additive< IntRect, IntPoint
> > > >
RectOps;
};
template<>
struct CoordTraits<Coord> {
typedef Point PointType;
typedef Interval IntervalType;
typedef OptInterval OptIntervalType;
typedef Rect RectType;
typedef OptRect OptRectType;
typedef
boost::equality_comparable< Interval
, boost::equality_comparable< Interval, IntInterval
, boost::additive< Interval
, boost::multipliable< Interval
, boost::orable< Interval
, boost::arithmetic< Interval, Coord
> > > > > >
IntervalOps;
typedef
boost::equality_comparable< Rect
, boost::equality_comparable< Rect, IntRect
, boost::orable< Rect
, boost::orable< Rect, OptRect
, boost::additive< Rect, Point
, boost::multipliable< Rect, Affine
> > > > > >
RectOps;
};
} // end namespace Geom
#endif // LIB2GEOM_SEEN_COORD_H
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
|
