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
137
138
139
140
141
142
|
#ifndef SEEN_SNAPPER_H
#define SEEN_SNAPPER_H
/**
* \file src/snapper.h
* \brief Snapper class.
*
* Authors:
* Carl Hetherington <inkscape@carlh.net>
*
* Released under GNU GPL, read the file 'COPYING' for more information.
*/
#include <map>
#include <list>
#include "libnr/nr-coord.h"
#include "libnr/nr-point.h"
#include "snapped-point.h"
struct SPNamedView;
struct SPItem;
namespace Inkscape
{
/// Parent for classes that can snap points to something
class Snapper
{
public:
Snapper() {}
Snapper(SPNamedView const *nv, ::NR::Coord const d);
virtual ~Snapper() {}
/// Point types to snap.
typedef int PointType;
static const PointType SNAP_POINT;
static const PointType BBOX_POINT;
typedef std::pair<PointType, NR::Point> PointWithType;
void setSnapTo(PointType t, bool s);
void setDistance(::NR::Coord d);
bool getSnapTo(PointType t) const;
::NR::Coord getDistance() const;
bool willSnapSomething() const;
void setEnabled(bool s);
SnappedPoint freeSnap(PointType t,
NR::Point const &p,
SPItem const *it) const;
SnappedPoint freeSnap(PointType t,
NR::Point const &p,
std::list<SPItem const *> const &it) const;
class ConstraintLine
{
public:
ConstraintLine(NR::Point const &d) : _has_point(false), _direction(d) {}
ConstraintLine(NR::Point const &p, NR::Point const &d) : _has_point(true), _point(p), _direction(d) {}
bool hasPoint() const {
return _has_point;
}
NR::Point getPoint() const {
return _point;
}
NR::Point getDirection() const {
return _direction;
}
private:
bool _has_point;
NR::Point _point;
NR::Point _direction;
};
SnappedPoint constrainedSnap(PointType t,
NR::Point const &p,
ConstraintLine const &c,
SPItem const *it) const;
SnappedPoint constrainedSnap(PointType t,
NR::Point const &p,
ConstraintLine const &c,
std::list<SPItem const *> const &it) const;
protected:
SPNamedView const *_named_view;
private:
/**
* Try to snap a point to whatever this snapper is interested in. Any
* snap that occurs will be to the nearest "interesting" thing (e.g. a
* grid or guide line)
*
* \param p Point to snap (desktop coordinates).
* \param it Items that should not be snapped to.
* \return Snapped point.
*/
virtual SnappedPoint _doFreeSnap(NR::Point const &p,
std::list<SPItem const *> const &it) const = 0;
/**
* Try to snap a point to whatever this snapper is interested in, where
* the snap point is constrained to lie along a specified vector from the
* original point.
*
* \param p Point to snap (desktop coordinates).
* \param c Vector to constrain the snap to.
* \param it Items that should not be snapped to.
* \return Snapped point.
*/
virtual SnappedPoint _doConstrainedSnap(NR::Point const &p,
ConstraintLine const &c,
std::list<SPItem const *> const &it) const = 0;
::NR::Coord _distance; ///< snap distance (desktop coordinates)
int _snap_to; ///< bitmap of point types that we will snap to
bool _enabled; ///< true if this snapper is enabled, otherwise false
};
}
#endif /* !SEEN_SNAPPER_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 :
|
