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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* TODO: insert short description here
*//*
* Authors: see git history
*
* Copyright (C) 2018 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <glibmm/i18n.h>
#include "context-fns.h"
#include "desktop.h"
#include "message-context.h"
#include "message-stack.h"
#include "snap.h"
#include "display/snap-indicator.h"
#include "object/sp-namedview.h"
#include "ui/tools/tool-base.h"
static const double midpt_1_goldenratio = (1 + goldenratio) / 2;
static const double midpt_goldenratio_2 = (goldenratio + 2) / 2;
/* FIXME: could probably use a template here */
/**
* Check to see if the current layer is both unhidden and unlocked. If not,
* set a message about it on the given context.
*
* \param desktop Desktop.
* \param message Message context to put messages on.
* \return true if the current layer is both unhidden and unlocked, otherwise false.
*/
bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageContext *message)
{
SPItem const *layer = SP_ITEM(desktop->currentLayer());
if ( !layer || desktop->itemIsHidden(layer) ) {
message->flash(Inkscape::ERROR_MESSAGE,
_("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
return false;
}
if ( !layer || layer->isLocked() ) {
message->flash(Inkscape::ERROR_MESSAGE,
_("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
return false;
}
return true;
}
/**
* Check to see if the current layer is both unhidden and unlocked. If not,
* set a message about it on the given context.
*
* \param desktop Desktop.
* \param message Message context to put messages on.
* \return true if the current layer is both unhidden and unlocked, otherwise false.
*/
bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageStack *message)
{
SPItem const *layer = SP_ITEM(desktop->currentLayer());
if ( !layer || desktop->itemIsHidden(layer) ) {
message->flash(Inkscape::WARNING_MESSAGE,
_("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
return false;
}
if ( !layer || layer->isLocked() ) {
message->flash(Inkscape::WARNING_MESSAGE,
_("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
return false;
}
return true;
}
Geom::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item,
Geom::Point const &pt, Geom::Point const ¢er, int state)
{
Geom::Point p[2];
bool const shift = state & GDK_SHIFT_MASK;
bool const control = state & GDK_CONTROL_MASK;
SnapManager &m = desktop->namedview->snap_manager;
m.setup(desktop, false, item);
Inkscape::SnappedPoint snappoint;
if (control) {
/* Control is down: we are constrained to producing integer-ratio rectangles */
/* Vector from the centre of the box to the point we are dragging to */
Geom::Point delta = pt - center;
/* Round it so that we have an integer-ratio (or golden ratio) box */
if (fabs(delta[Geom::X]) > fabs(delta[Geom::Y]) && (delta[Geom::Y] != 0.0)) {
double ratio = delta[Geom::X] / delta[Geom::Y];
double ratioabs = fabs (ratio);
double sign = (ratio < 0 ? -1 : 1);
if (midpt_1_goldenratio < ratioabs && ratioabs < midpt_goldenratio_2) {
delta[Geom::X] = sign * goldenratio * delta[Geom::Y];
} else {
delta[Geom::X] = floor(ratio + 0.5) * delta[Geom::Y];
}
} else if (delta[Geom::X] != 0.0) {
double ratio = delta[Geom::Y] / delta[Geom::X];
double ratioabs = fabs (ratio);
double sign = (ratio < 0 ? -1 : 1);
if (midpt_1_goldenratio < ratioabs && ratioabs < midpt_goldenratio_2) {
delta[Geom::Y] = sign * goldenratio * delta[Geom::X];
} else {
delta[Geom::Y] = floor(delta[Geom::Y] / delta[Geom::X] + 0.5) * delta[Geom::X];
}
}
/* p[1] is the dragged point with the integer-ratio constraint */
p[1] = center + delta;
if (shift) {
/* Shift is down, so our origin is the centre point rather than the corner
** point; this means that corner-point movements are bound to each other.
*/
/* p[0] is the opposite corner of our box */
p[0] = center - delta;
Inkscape::SnappedPoint s[2];
/* Try to snap p[0] (the opposite corner) along the constraint vector */
s[0] = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[0], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::SnapConstraint(p[0] - p[1]));
/* Try to snap p[1] (the dragged corner) along the constraint vector */
s[1] = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::SnapConstraint(p[1] - p[0]));
/* Choose the best snap and update points accordingly */
if (s[0].getSnapDistance() < s[1].getSnapDistance()) {
if (s[0].getSnapped()) {
p[0] = s[0].getPoint();
p[1] = 2 * center - s[0].getPoint();
snappoint = s[0];
}
} else {
if (s[1].getSnapped()) {
p[0] = 2 * center - s[1].getPoint();
p[1] = s[1].getPoint();
snappoint = s[1];
}
}
} else {
/* Our origin is the opposite corner. Snap the drag point along the constraint vector */
p[0] = center;
snappoint = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::SnapConstraint(p[1] - p[0]));
if (snappoint.getSnapped()) {
p[1] = snappoint.getPoint();
}
}
} else if (shift) {
/* Shift is down, so our origin is the centre point rather than the corner point;
** this means that corner-point movements are bound to each other.
*/
p[1] = pt;
p[0] = 2 * center - p[1];
Inkscape::SnappedPoint s[2];
s[0] = m.freeSnap(Inkscape::SnapCandidatePoint(p[0], Inkscape::SNAPSOURCE_NODE_HANDLE));
s[1] = m.freeSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE));
if (s[0].getSnapDistance() < s[1].getSnapDistance()) {
if (s[0].getSnapped()) {
p[0] = s[0].getPoint();
p[1] = 2 * center - s[0].getPoint();
snappoint = s[0];
}
} else {
if (s[1].getSnapped()) {
p[0] = 2 * center - s[1].getPoint();
p[1] = s[1].getPoint();
snappoint = s[1];
}
}
} else {
/* There's no constraint on the corner point, so just snap it to anything */
p[0] = center;
p[1] = pt;
snappoint = m.freeSnap(Inkscape::SnapCandidatePoint(pt, Inkscape::SNAPSOURCE_NODE_HANDLE));
if (snappoint.getSnapped()) {
p[1] = snappoint.getPoint();
}
}
if (snappoint.getSnapped()) {
desktop->snapindicator->set_new_snaptarget(snappoint);
}
p[0] *= desktop->dt2doc();
p[1] *= desktop->dt2doc();
m.unSetup();
return Geom::Rect(Geom::Point(MIN(p[0][Geom::X], p[1][Geom::X]), MIN(p[0][Geom::Y], p[1][Geom::Y])),
Geom::Point(MAX(p[0][Geom::X], p[1][Geom::X]), MAX(p[0][Geom::Y], p[1][Geom::Y])));
}
Geom::Point Inkscape::setup_for_drag_start(SPDesktop *desktop, Inkscape::UI::Tools::ToolBase* ec, GdkEvent *ev)
{
ec->xp = static_cast<gint>(ev->button.x);
ec->yp = static_cast<gint>(ev->button.y);
ec->within_tolerance = true;
Geom::Point const p(ev->button.x, ev->button.y);
ec->item_to_select = Inkscape::UI::Tools::sp_event_context_find_item(desktop, p, ev->button.state & GDK_MOD1_MASK, TRUE);
return ec->desktop->w2d(p);
}
/*
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 :
|
