1 /*
2 * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #include <cmath>
20
21 #include <cairomm/context.h>
22
23 #include "ardour/automation_control.h"
24 #include "ardour/value_as_string.h"
25 #include "ardour/dB.h"
26 #include "ardour/utils.h"
27
28 #include "gtkmm2ext/colors.h"
29 #include "gtkmm2ext/gui_thread.h"
30 #include "gtkmm2ext/rgb_macros.h"
31
32 #include "canvas/text.h"
33
34 #include "maschine2.h"
35 #include "m2controls.h"
36
37 #include "ui_knob.h"
38
39 #include "pbd/i18n.h"
40
41 #ifdef __APPLE__
42 #define Rect ArdourCanvas::Rect
43 #endif
44
45 using namespace PBD;
46 using namespace ARDOUR;
47 using namespace ArdourSurface;
48 using namespace ArdourCanvas;
49
Maschine2Knob(PBD::EventLoop * el,Item * parent)50 Maschine2Knob::Maschine2Knob (PBD::EventLoop* el, Item* parent)
51 : Container (parent)
52 , _ctrl (0)
53 , _eventloop (el)
54 , _radius (11)
55 , _val (0)
56 , _normal (0)
57 {
58 Pango::FontDescription fd ("Sans 10px");
59
60 text = new Text (this);
61 text->set_font_description (fd);
62 text->set_position (Duple (-_radius, _radius + 2));
63 text->set_color (0xffffffff);
64 _bounding_box_dirty = true;
65 }
66
~Maschine2Knob()67 Maschine2Knob::~Maschine2Knob ()
68 {
69 }
70
71 void
render(Rect const & area,Cairo::RefPtr<Cairo::Context> context) const72 Maschine2Knob::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
73 {
74 if (!_controllable) {
75 /* no controllable, nothing to draw */
76 return;
77 }
78
79 // TODO consider a "bar" circular shape + 1bit b/w is ugly
80
81 const float scale = 2.f * _radius;
82 const float pointer_thickness = std::max (1.f, 3.f * (scale / 80.f));
83
84 const float start_angle = ((180.f - 65.f) * M_PI) / 180.f;
85 const float end_angle = ((360.f + 65.f) * M_PI) / 180.f;
86
87 float zero = 0;
88
89 const float value_angle = start_angle + (_val * (end_angle - start_angle));
90 const float zero_angle = start_angle + (zero * (end_angle - start_angle));
91
92 float value_x = cos (value_angle);
93 float value_y = sin (value_angle);
94
95 /* translate so that all coordinates are based on the center of the
96 * knob (which is also its position()
97 */
98 context->save ();
99 Duple origin = item_to_window (Duple (0, 0));
100 context->translate (origin.x - 0.5, origin.y - 0.5);
101 context->begin_new_path ();
102
103 float center_radius = 0.48*scale;
104 float border_width = 0.8;
105
106 const bool arc = true;
107
108 if (arc) {
109 center_radius = scale * 0.33;
110
111 float inner_progress_radius = scale * 0.38;
112 float outer_progress_radius = scale * 0.48;
113 float progress_width = (outer_progress_radius-inner_progress_radius);
114 float progress_radius = inner_progress_radius + progress_width/2.0;
115
116 // draw the arc
117 context->set_source_rgb (1, 1, 1);
118 context->set_line_width (progress_width);
119 if (zero_angle > value_angle) {
120 context->arc (0, 0, progress_radius, value_angle, zero_angle);
121 } else {
122 context->arc (0, 0, progress_radius, zero_angle, value_angle);
123 }
124 context->stroke ();
125 }
126
127 // knob body
128 context->set_line_width (border_width);
129 context->set_source_rgb (1, 1, 1);
130 context->arc (0, 0, center_radius, 0, 2.0*G_PI);
131 context->fill ();
132
133 // line
134 context->set_source_rgb (0, 0, 0);
135 context->set_line_cap (Cairo::LINE_CAP_ROUND);
136 context->set_line_width (pointer_thickness);
137 context->move_to ((center_radius * value_x), (center_radius * value_y));
138 context->line_to (((center_radius * 0.2) * value_x), ((center_radius * 0.2) * value_y));
139 context->stroke ();
140
141 /* reset all translations, scaling etc. */
142 context->restore ();
143
144 render_children (area, context);
145 }
146
147 void
compute_bounding_box() const148 Maschine2Knob::compute_bounding_box () const
149 {
150 if (!_canvas || _radius == 0) {
151 _bounding_box = Rect ();
152 _bounding_box_dirty = false;
153 return;
154 }
155
156 if (_bounding_box_dirty) {
157 _bounding_box = Rect (- _radius, - _radius, _radius, _radius);
158 _bounding_box_dirty = false;
159 }
160
161 add_child_bounding_boxes ();
162 }
163
164 void
set_controllable(boost::shared_ptr<AutomationControl> c)165 Maschine2Knob::set_controllable (boost::shared_ptr<AutomationControl> c)
166 {
167 watch_connection.disconnect ();
168
169 if (!c) {
170 _controllable.reset ();
171 return;
172 }
173
174 _controllable = c;
175 _controllable->Changed.connect (watch_connection, invalidator(*this), boost::bind (&Maschine2Knob::controllable_changed, this), _eventloop);
176
177 controllable_changed ();
178 // set _controllable->desc()->label
179 }
180
181 void
set_control(M2EncoderInterface * ctrl)182 Maschine2Knob::set_control (M2EncoderInterface* ctrl)
183 {
184 encoder_connection.disconnect ();
185 _ctrl = ctrl;
186 if (!ctrl) {
187 return;
188 }
189 ctrl->changed.connect_same_thread (encoder_connection, boost::bind (&Maschine2Knob::encoder_changed, this, _1));
190 }
191
192 void
encoder_changed(int delta)193 Maschine2Knob::encoder_changed (int delta)
194 {
195 if (!_controllable) {
196 return;
197 }
198 const double d = delta * 0.5 / _ctrl->range ();
199 boost::shared_ptr<AutomationControl> ac = _controllable;
200 ac->set_value (ac->interface_to_internal (std::min (ac->upper(), std::max (ac->lower(), ac->internal_to_interface (ac->get_value()) + d))), PBD::Controllable::UseGroup);
201 }
202
203 void
controllable_changed()204 Maschine2Knob::controllable_changed ()
205 {
206 if (_controllable) {
207 _normal = _controllable->internal_to_interface (_controllable->normal());
208 _val = _controllable->internal_to_interface (_controllable->get_value());
209
210 const ParameterDescriptor& desc (_controllable->desc());
211
212 char buf[64];
213 switch (_controllable->parameter().type()) {
214 case ARDOUR::PanAzimuthAutomation:
215 snprintf (buf, sizeof (buf), _("L:%3d R:%3d"), (int) rint (100.0 * (1.0 - _val)), (int) rint (100.0 * _val));
216 text->set (buf);
217 break;
218
219 case ARDOUR::PanWidthAutomation:
220 snprintf (buf, sizeof (buf), "%d%%", (int) floor (_val*100));
221 text->set (buf);
222 break;
223
224 case ARDOUR::GainAutomation:
225 case ARDOUR::BusSendLevel:
226 case ARDOUR::TrimAutomation:
227 snprintf (buf, sizeof (buf), "%+4.1f dB", accurate_coefficient_to_dB (_controllable->get_value()));
228 text->set (buf);
229 break;
230
231 default:
232 text->set (ARDOUR::value_as_string (desc, _val));
233 break;
234 }
235 } else {
236 text->set ("---");
237 }
238
239 redraw ();
240 }
241