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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/**
* \file src/snapper.cpp
* \brief Snapper class.
*
* Authors:
* Carl Hetherington <inkscape@carlh.net>
* Diederik van Lierop <mail@diedenrezi.nl>
*
* Released under GNU GPL, read the file 'COPYING' for more information.
*/
#include "libnr/nr-values.h"
#include "sp-namedview.h"
#include "inkscape.h"
#include "desktop.h"
Inkscape::Snapper::PointType const Inkscape::Snapper::SNAPPOINT_BBOX = 0x1;
Inkscape::Snapper::PointType const Inkscape::Snapper::SNAPPOINT_NODE = 0x2;
Inkscape::Snapper::PointType const Inkscape::Snapper::SNAPPOINT_GUIDE = 0x4;
/**
* Construct new Snapper for named view.
* \param nv Named view.
* \param d Snap tolerance.
*/
Inkscape::Snapper::Snapper(SPNamedView const *nv, NR::Coord const t) : _named_view(nv), _snap_enabled(true), _snapper_tolerance(t)
{
g_assert(_named_view != NULL);
g_assert(SP_IS_NAMEDVIEW(_named_view));
setSnapFrom(SNAPPOINT_BBOX | SNAPPOINT_NODE, true); //Snap any point. In v0.45 and earlier, this was controlled in the preferences tab
}
/**
* Set snap tolerance.
* \param d New snap tolerance (desktop coordinates)
*/
void Inkscape::Snapper::setSnapperTolerance(NR::Coord const d)
{
_snapper_tolerance = d;
}
/**
* \return Snap tolerance (desktop coordinates); depends on current zoom so that it's always the same in screen pixels
*/
NR::Coord Inkscape::Snapper::getSnapperTolerance() const
{
return _snapper_tolerance / SP_ACTIVE_DESKTOP->current_zoom();
}
bool Inkscape::Snapper::getSnapperAlwaysSnap() const
{
return _snapper_tolerance == 10000; //TODO: Replace this threshold of 10000 by a constant; see also tolerance-slider.cpp
}
/**
* Turn on/off snapping of specific point types.
* \param t Point type.
* \param s true to snap to this point type, otherwise false;
*/
void Inkscape::Snapper::setSnapFrom(PointType t, bool s)
{
if (s) {
_snap_from |= t;
} else {
_snap_from &= ~t;
}
}
/**
* \param t Point type.
* \return true if snapper will snap this type of point, otherwise false.
*/
bool Inkscape::Snapper::getSnapFrom(PointType t) const
{
return (_snap_from & t);
}
/**
* \param s true to enable this snapper, otherwise false.
*/
void Inkscape::Snapper::setEnabled(bool s)
{
_snap_enabled = s;
}
/**
* 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 t Point type.
* \param p Point to snap (desktop coordinates).
* \param it Item that should not be snapped to.
* \return Snapped point.
*/
void Inkscape::Snapper::freeSnap(SnappedConstraints &sc,
PointType const &t,
NR::Point const &p,
bool const &first_point,
std::vector<NR::Point> &points_to_snap,
SPItem const *it) const
{
std::list<SPItem const *> lit;
if (it) {
lit.push_back(it);
}
freeSnap(sc, t, p, first_point, points_to_snap, lit, NULL);
}
/**
* 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 t Point type.
* \param p Point to snap (desktop coordinates).
* \param it Items that should not be snapped to.
* \return Snapped point.
*/
void Inkscape::Snapper::freeSnap(SnappedConstraints &sc,
PointType const &t,
NR::Point const &p,
bool const &first_point,
std::vector<NR::Point> &points_to_snap,
std::list<SPItem const *> const &it,
std::vector<NR::Point> *unselected_nodes) const
{
if (_snap_enabled == false || getSnapFrom(t) == false) {
return;
}
_doFreeSnap(sc, t, p, first_point, points_to_snap, it, unselected_nodes);
}
/**
* 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.
*/
void Inkscape::Snapper::constrainedSnap(SnappedConstraints &sc,
PointType const &t,
NR::Point const &p,
bool const &first_point,
std::vector<NR::Point> &points_to_snap,
ConstraintLine const &c,
SPItem const *it) const
{
std::list<SPItem const *> lit;
lit.push_back(it);
constrainedSnap(sc, t, p, first_point, points_to_snap, c, lit);
}
/**
* 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.
*/
void Inkscape::Snapper::constrainedSnap(SnappedConstraints &sc,
PointType const &t,
NR::Point const &p,
bool const &first_point,
std::vector<NR::Point> &points_to_snap,
ConstraintLine const &c,
std::list<SPItem const *> const &it) const
{
if (_snap_enabled == false || getSnapFrom(t) == false) {
return;
}
_doConstrainedSnap(sc, t, p, first_point, points_to_snap, c, it);
}
/*
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 :
|
