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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Authors:
* buliabyak@gmail.com
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <gtkmm/box.h>
#include <gtkmm/eventbox.h>
#include <2geom/point.h>
#include "ui/tools/tool-base.h"
#include "rotateable.h"
namespace Inkscape {
namespace UI {
namespace Widget {
Rotateable::Rotateable():
axis(-M_PI/4),
maxdecl(M_PI/4)
{
dragging = false;
working = false;
scrolling = false;
modifier = 0;
current_axis = axis;
signal_button_press_event().connect(sigc::mem_fun(*this, &Rotateable::on_click));
signal_motion_notify_event().connect(sigc::mem_fun(*this, &Rotateable::on_motion));
signal_button_release_event().connect(sigc::mem_fun(*this, &Rotateable::on_release));
gtk_widget_add_events(GTK_WIDGET(gobj()), GDK_SCROLL_MASK | GDK_SMOOTH_SCROLL_MASK);
signal_scroll_event().connect(sigc::mem_fun(*this, &Rotateable::on_scroll));
}
bool Rotateable::on_click(GdkEventButton *event) {
if (event->button == 1) {
drag_started_x = event->x;
drag_started_y = event->y;
modifier = get_single_modifier(modifier, event->state);
dragging = true;
working = false;
current_axis = axis;
return true;
}
return false;
}
guint Rotateable::get_single_modifier(guint old, guint state) {
if (old == 0 || old == 3) {
if (state & GDK_CONTROL_MASK)
return 1; // ctrl
if (state & GDK_SHIFT_MASK)
return 2; // shift
if (state & GDK_MOD1_MASK)
return 3; // alt
return 0;
} else {
if (!(state & GDK_CONTROL_MASK) && !(state & GDK_SHIFT_MASK)) {
if (state & GDK_MOD1_MASK)
return 3; // alt
else
return 0; // none
}
if (old == 1) {
if (state & GDK_SHIFT_MASK && !(state & GDK_CONTROL_MASK))
return 2; // shift
if (state & GDK_MOD1_MASK && !(state & GDK_CONTROL_MASK))
return 3; // alt
return 1;
}
if (old == 2) {
if (state & GDK_CONTROL_MASK && !(state & GDK_SHIFT_MASK))
return 1; // ctrl
if (state & GDK_MOD1_MASK && !(state & GDK_SHIFT_MASK))
return 3; // alt
return 2;
}
return old;
}
}
bool Rotateable::on_motion(GdkEventMotion *event) {
if (dragging) {
double dist = Geom::L2(Geom::Point(event->x, event->y) - Geom::Point(drag_started_x, drag_started_y));
double angle = atan2(event->y - drag_started_y, event->x - drag_started_x);
if (dist > 20) {
working = true;
double force = CLAMP (-(angle - current_axis)/maxdecl, -1, 1);
if (fabs(force) < 0.002)
force = 0; // snap to zero
if (modifier != get_single_modifier(modifier, event->state)) {
// user has switched modifiers in mid drag, close past drag and start a new
// one, redefining axis temporarily
do_release(force, modifier);
current_axis = angle;
modifier = get_single_modifier(modifier, event->state);
} else {
do_motion(force, modifier);
}
}
return true;
}
return false;
}
bool Rotateable::on_release(GdkEventButton *event) {
if (dragging && working) {
double angle = atan2(event->y - drag_started_y, event->x - drag_started_x);
double force = CLAMP(-(angle - current_axis) / maxdecl, -1, 1);
if (fabs(force) < 0.002)
force = 0; // snap to zero
do_release(force, modifier);
current_axis = axis;
dragging = false;
working = false;
return true;
}
dragging = false;
working = false;
return false;
}
bool Rotateable::on_scroll(GdkEventScroll* event)
{
double change = 0.0;
if (event->direction == GDK_SCROLL_UP) {
change = 1.0;
} else if (event->direction == GDK_SCROLL_DOWN) {
change = -1.0;
} else if (event->direction == GDK_SCROLL_SMOOTH) {
double delta_y_clamped = CLAMP(event->delta_y, -1.0, 1.0); // values > 1 result in excessive changes
change = 1.0 * -delta_y_clamped;
} else {
return FALSE;
}
drag_started_x = event->x;
drag_started_y = event->y;
modifier = get_single_modifier(modifier, event->state);
dragging = false;
working = false;
scrolling = true;
current_axis = axis;
do_scroll(change, modifier);
dragging = false;
working = false;
scrolling = false;
return TRUE;
}
Rotateable::~Rotateable() = default;
} // namespace Widget
} // namespace UI
} // namespace Inkscape
/*
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 :
|
