gtk2_ardour/panner2d.cc

   1 /*
   2     Copyright (C) 2002 Paul Davis
   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
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <cmath>
  21 #include <climits>
  22 #include <string.h>
  23
  24 #include <cairo.h>
  25 #include <gtkmm/menu.h>
  26
  27 #include "gtkmm2ext/gtk_ui.h"
  28
  29 #include "pbd/error.h"
  30 #include "pbd/cartesian.h"
  31 #include "ardour/panner.h"
  32 #include "ardour/panner_shell.h"
  33 #include "ardour/pannable.h"
  34 #include "ardour/speakers.h"
  35
  36 #include "panner2d.h"
  37 #include "keyboard.h"
  38 #include "gui_thread.h"
  39 #include "utils.h"
  40 #include "public_editor.h"
  41
  42 #include "i18n.h"
  43
  44 using namespace std;
  45 using namespace Gtk;
  46 using namespace ARDOUR;
  47 using namespace PBD;
  48 using Gtkmm2ext::Keyboard;
  49
  50 static const int large_size_threshold = 100;
  51 static const int large_border_width = 25;
  52 static const int small_border_width = 8;
  53
  54 Panner2d::Target::Target (const AngularVector& a, const char *txt)
  55         : position (a)
  56         , text (txt)
  57         , _selected (false)
  58 {
  59 }
  60
  61 Panner2d::Target::~Target ()
  62 {
  63 }
  64
  65 void
  66 Panner2d::Target::set_text (const char* txt)
  67 {
  68         text = txt;
  69 }
  70
  71 Panner2d::Panner2d (boost::shared_ptr<PannerShell> p, int32_t h)
  72         : panner_shell (p)
  73         , position (AngularVector (0.0, 0.0), "")
  74         , width (0)
  75         , height (h)
  76         , last_width (0)
  77         , have_elevation (false)
  78 {
  79         panner_shell->Changed.connect (connections, invalidator (*this), boost::bind (&Panner2d::handle_state_change, this), gui_context());
  80
  81         panner_shell->panner()->SignalPositionChanged.connect (panconnect, invalidator(*this), boost::bind (&Panner2d::handle_position_change, this), gui_context());
  82
  83         drag_target = 0;
  84         set_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK);
  85
  86         handle_state_change ();
  87         handle_position_change ();
  88 }
  89
  90 Panner2d::~Panner2d()
  91 {
  92         for (Targets::iterator i = speakers.begin(); i != speakers.end(); ++i) {
  93                 delete *i;
  94         }
  95 }
  96
  97 void
  98 Panner2d::reset (uint32_t n_inputs)
  99 {
 100         uint32_t nouts = panner_shell->panner()->out().n_audio();
 101
 102         /* signals */
 103
 104         while (signals.size() < n_inputs) {
 105                 add_signal ("", AngularVector());
 106         }
 107
 108         if (signals.size() > n_inputs) {
 109                 for (uint32_t i = signals.size(); i < n_inputs; ++i) {
 110                         delete signals[i];
 111                 }
 112
 113                 signals.resize (n_inputs);
 114         }
 115
 116         label_signals ();
 117
 118         for (uint32_t i = 0; i < n_inputs; ++i) {
 119                 signals[i]->position = panner_shell->panner()->signal_position (i);
 120         }
 121
 122         /* add all outputs */
 123
 124         while (speakers.size() < nouts) {
 125                 add_speaker (AngularVector());
 126         }
 127
 128         if (speakers.size() > nouts) {
 129                 for (uint32_t i = nouts; i < speakers.size(); ++i) {
 130                         delete speakers[i];
 131                 }
 132
 133                 speakers.resize (nouts);
 134         }
 135
 136         for (Targets::iterator x = speakers.begin(); x != speakers.end(); ++x) {
 137                 (*x)->visible = false;
 138         }
 139
 140         vector<Speaker>& the_speakers (panner_shell->panner()->get_speakers()->speakers());
 141
 142         for (uint32_t n = 0; n < nouts; ++n) {
 143                 char buf[16];
 144
 145                 snprintf (buf, sizeof (buf), "%d", n+1);
 146                 speakers[n]->set_text (buf);
 147                 speakers[n]->position = the_speakers[n].angles();
 148                 speakers[n]->visible = true;
 149         }
 150
 151         queue_draw ();
 152 }
 153
 154 void
 155 Panner2d::on_size_allocate (Gtk::Allocation& alloc)
 156 {
 157         width = alloc.get_width();
 158         height = alloc.get_height();
 159
 160         if (height > large_size_threshold) {
 161                 border = large_border_width;
 162         } else {
 163                 border = small_border_width;
 164         }
 165
 166         radius = min (width, height);
 167         radius -= border;
 168         radius /= 2;
 169
 170         hoffset = max ((double) (width - height), border);
 171         voffset = max ((double) (height - width), border);
 172
 173         hoffset = rint(hoffset / 2.0);
 174         voffset = rint(voffset / 2.0);
 175
 176         DrawingArea::on_size_allocate (alloc);
 177 }
 178
 179 int
 180 Panner2d::add_signal (const char* text, const AngularVector& a)
 181 {
 182         Target* signal = new Target (a, text);
 183         signals.push_back (signal);
 184         signal->visible = true;
 185
 186         return 0;
 187 }
 188
 189 int
 190 Panner2d::add_speaker (const AngularVector& a)
 191 {
 192         Target* speaker = new Target (a, "");
 193         speakers.push_back (speaker);
 194         speaker->visible = true;
 195         queue_draw ();
 196
 197         return speakers.size() - 1;
 198 }
 199
 200 void
 201 Panner2d::handle_state_change ()
 202 {
 203         panconnect.drop_connections();
 204         if (!panner_shell->panner()) {
 205                 /* we should really self-destruct the UI here
 206                  * -> * PannerUI::set_panner() -> delete
 207                  */
 208                 queue_draw ();
 209                 return;
 210         }
 211
 212         panner_shell->panner()->SignalPositionChanged.connect (panconnect, invalidator(*this), boost::bind (&Panner2d::handle_position_change, this), gui_context());
 213
 214         set<Evoral::Parameter> params = panner_shell->panner()->what_can_be_automated();
 215         set<Evoral::Parameter>::iterator p = params.find(PanElevationAutomation);
 216         bool elev = have_elevation;
 217         have_elevation = (p == params.end()) ? false : true;
 218         if (elev != have_elevation) {
 219                 handle_position_change();
 220         }
 221         queue_draw ();
 222 }
 223
 224 void
 225 Panner2d::label_signals ()
 226 {
 227         uint32_t sz = signals.size();
 228
 229         switch (sz) {
 230         case 0:
 231                 break;
 232
 233         case 1:
 234                 signals[0]->set_text ("");
 235                 break;
 236
 237         case 2:
 238                 signals[0]->set_text (_("L"));
 239                 signals[1]->set_text (_("R"));
 240                 break;
 241
 242         default:
 243                 for (uint32_t i = 0; i < sz; ++i) {
 244                         char buf[64];
 245                         snprintf (buf, sizeof (buf), "%" PRIu32, i + 1);
 246                         signals[i]->set_text (buf);
 247                 }
 248                 break;
 249         }
 250 }
 251
 252 void
 253 Panner2d::handle_position_change ()
 254 {
 255         uint32_t n;
 256         double w = panner_shell->pannable()->pan_width_control->get_value();
 257
 258         if (have_elevation) {
 259                 position.position = AngularVector (panner_shell->pannable()->pan_azimuth_control->get_value() * 360.0,
 260                                                    panner_shell->pannable()->pan_elevation_control->get_value() * 90.0);
 261         } else {
 262                 position.position = AngularVector (panner_shell->pannable()->pan_azimuth_control->get_value() * 360.0, 0);
 263         }
 264
 265         for (uint32_t i = 0; i < signals.size(); ++i) {
 266                 signals[i]->position = panner_shell->panner()->signal_position (i);
 267         }
 268
 269         if (w * last_width <= 0) {
 270                 /* changed sign */
 271                 label_signals ();
 272         }
 273
 274         last_width = w;
 275
 276         vector<Speaker>& the_speakers (panner_shell->panner()->get_speakers()->speakers());
 277
 278         for (n = 0; n < speakers.size(); ++n) {
 279                 speakers[n]->position = the_speakers[n].angles();
 280         }
 281
 282         queue_draw ();
 283 }
 284
 285 void
 286 Panner2d::move_signal (int which, const AngularVector& a)
 287 {
 288         if (which >= int (speakers.size())) {
 289                 return;
 290         }
 291
 292         speakers[which]->position = a;
 293         queue_draw ();
 294 }
 295
 296 Panner2d::Target *
 297 Panner2d::find_closest_object (gdouble x, gdouble y, bool& is_signal)
 298 {
 299         Target *closest = 0;
 300         Target *candidate;
 301         float distance;
 302         float best_distance = FLT_MAX;
 303         CartesianVector c;
 304
 305         /* start with the position itself */
 306
 307         position.position.cartesian (c);
 308         cart_to_gtk (c);
 309         best_distance = sqrt ((c.x - x) * (c.x - x) +
 310                          (c.y - y) * (c.y - y));
 311         closest = &position;
 312
 313 #if 0 // TODO signal grab -> change width, not position
 314         for (Targets::const_iterator i = signals.begin(); i != signals.end(); ++i) {
 315                 candidate = *i;
 316
 317                 candidate->position.cartesian (c);
 318                 cart_to_gtk (c);
 319
 320                 distance = sqrt ((c.x - x) * (c.x - x) +
 321                                  (c.y - y) * (c.y - y));
 322
 323                 if (distance < best_distance) {
 324                         closest = candidate;
 325                         best_distance = distance;
 326                 }
 327         }
 328 #endif
 329
 330         is_signal = true;
 331
 332         if (height > large_size_threshold) {
 333                 /* "big" */
 334                 if (best_distance > 30) { // arbitrary
 335                         closest = 0;
 336                 }
 337         } else {
 338                 /* "small" */
 339                 if (best_distance > 10) { // arbitrary
 340                         closest = 0;
 341                 }
 342         }
 343
 344         /* if we didn't find a signal close by, check the speakers */
 345
 346         if (!closest) {
 347                 for (Targets::const_iterator i = speakers.begin(); i != speakers.end(); ++i) {
 348                         candidate = *i;
 349
 350                         candidate->position.cartesian (c);
 351                         cart_to_gtk (c);
 352
 353                         distance = sqrt ((c.x - x) * (c.x - x) +
 354                                          (c.y - y) * (c.y - y));
 355
 356                         if (distance < best_distance) {
 357                                 closest = candidate;
 358                                 best_distance = distance;
 359                         }
 360                 }
 361
 362                 if (height > large_size_threshold) {
 363                         /* "big" */
 364                         if (best_distance < 30) { // arbitrary
 365                                 is_signal = false;
 366                         } else {
 367                                 closest = 0;
 368                         }
 369                 } else {
 370                         /* "small" */
 371                         if (best_distance < 10) { // arbitrary
 372                                 is_signal = false;
 373                         } else {
 374                                 closest = 0;
 375                         }
 376                 }
 377         }
 378
 379         return closest;
 380 }
 381
 382 bool
 383 Panner2d::on_motion_notify_event (GdkEventMotion *ev)
 384 {
 385         gint x, y;
 386         GdkModifierType state;
 387
 388         if (ev->is_hint) {
 389                 gdk_window_get_pointer (ev->window, &x, &y, &state);
 390         } else {
 391                 x = (int) floor (ev->x);
 392                 y = (int) floor (ev->y);
 393                 state = (GdkModifierType) ev->state;
 394         }
 395
 396         if (ev->state & (GDK_BUTTON1_MASK|GDK_BUTTON2_MASK)) {
 397                 did_move = true;
 398         }
 399
 400         return handle_motion (x, y, state);
 401 }
 402
 403 bool
 404 Panner2d::on_expose_event (GdkEventExpose *event)
 405 {
 406         CartesianVector c;
 407         cairo_t* cr;
 408         bool small = (height <= large_size_threshold);
 409         const double diameter = radius*2.0;
 410
 411         cr = gdk_cairo_create (get_window()->gobj());
 412
 413         /* background */
 414
 415         cairo_rectangle (cr, event->area.x, event->area.y, event->area.width, event->area.height);
 416         if (!panner_shell->bypassed()) {
 417                 cairo_set_source_rgba (cr, 0.1, 0.1, 0.1, 1.0);
 418         } else {
 419                 cairo_set_source_rgba (cr, 0.1, 0.1, 0.1, 0.2);
 420         }
 421         cairo_fill_preserve (cr);
 422         cairo_clip (cr);
 423
 424         /* offset to give us some border */
 425
 426         cairo_translate (cr, hoffset, voffset);
 427
 428         cairo_set_line_width (cr, 1.0);
 429
 430         /* horizontal line of "crosshairs" */
 431
 432         cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
 433         cairo_move_to (cr, 0.0, rint(radius) - .5);
 434         cairo_line_to (cr, diameter, rint(radius) - .5);
 435         cairo_stroke (cr);
 436
 437         /* vertical line of "crosshairs" */
 438
 439         cairo_move_to (cr, rint(radius) - .5, 0);
 440         cairo_line_to (cr, rint(radius) - .5, diameter);
 441         cairo_stroke (cr);
 442
 443         /* the circle on which signals live */
 444
 445         cairo_set_line_width (cr, 1.5);
 446         cairo_set_source_rgba (cr, 0.517, 0.772, 0.882, 1.0);
 447         cairo_arc (cr, radius, radius, radius, 0.0, 2.0 * M_PI);
 448         cairo_stroke (cr);
 449
 450         for (uint32_t rad = 15; rad < 90; rad += 15) {
 451                 cairo_set_line_width (cr, .5 + (float)rad / 150.0);
 452                 if (rad == 45) {
 453                         cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
 454                 } else {
 455                         cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.8);
 456                 }
 457                 cairo_new_path (cr);
 458                 cairo_arc (cr, radius, radius, radius * sin(M_PI * (float) rad / 180.0), 0, 2.0 * M_PI);
 459                 cairo_stroke (cr);
 460         }
 461
 462         if (!panner_shell->bypassed()) {
 463
 464                 if (signals.size() > 1) {
 465                         /* arc to show "diffusion" */
 466
 467                         double width_angle = fabs (panner_shell->pannable()->pan_width_control->get_value()) * 2 * M_PI;
 468                         double position_angle = (2 * M_PI) - panner_shell->pannable()->pan_azimuth_control->get_value() * 2 * M_PI;
 469
 470                         cairo_save (cr);
 471                         cairo_translate (cr, radius, radius);
 472                         cairo_rotate (cr, position_angle - (width_angle/2.0));
 473                         cairo_move_to (cr, 0, 0);
 474                         cairo_arc_negative (cr, 0, 0, radius, width_angle, 0.0);
 475                         cairo_close_path (cr);
 476                         if (panner_shell->pannable()->pan_width_control->get_value() >= 0.0) {
 477                                 /* normal width */
 478                                 cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.45);
 479                         } else {
 480                                 /* inverse width */
 481                                 cairo_set_source_rgba (cr, 1.0, 0.419, 0.419, 0.45);
 482                         }
 483                         cairo_fill (cr);
 484                         cairo_restore (cr);
 485                 }
 486
 487                 double arc_radius;
 488
 489                 cairo_select_font_face (cr, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
 490
 491                 if (small) {
 492                         arc_radius = 4.0;
 493                 } else {
 494                         cairo_set_font_size (cr, 10);
 495                         arc_radius = 12.0;
 496                 }
 497
 498                 /* draw position */
 499
 500                 position.position.cartesian (c);
 501                 cart_to_gtk (c);
 502
 503                 cairo_new_path (cr);
 504                 cairo_arc (cr, c.x, c.y, arc_radius + 1.0, 0, 2.0 * M_PI);
 505                 cairo_set_source_rgba (cr, 1.0, 0.419, 0.419, 0.85);
 506                 cairo_fill_preserve (cr);
 507                 cairo_set_source_rgba (cr, 1.0, 0.905, 0.905, 0.85);
 508                 cairo_stroke (cr);
 509
 510                 /* signals */
 511
 512                 if (signals.size() > 1) {
 513                         for (Targets::iterator i = signals.begin(); i != signals.end(); ++i) {
 514                                 Target* signal = *i;
 515
 516                                 if (signal->visible) {
 517
 518                                         /* TODO check for overlap - multiple src at same position
 519                                          * -> visualize it properly
 520                                          */
 521                                         PBD::AngularVector sp = signal->position;
 522                                         if (!have_elevation) sp.ele = 0;
 523                                         sp.cartesian (c);
 524                                         cart_to_gtk (c);
 525
 526                                         cairo_new_path (cr);
 527                                         cairo_arc (cr, c.x, c.y, arc_radius, 0, 2.0 * M_PI);
 528                                         cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.75);
 529                                         cairo_fill_preserve (cr);
 530                                         cairo_set_source_rgba (cr, 0.517, 0.772, 0.882, 0.8);
 531                                         cairo_stroke (cr);
 532
 533                                         if (!small && !signal->text.empty()) {
 534                                                 cairo_set_source_rgba (cr, 0.517, 0.772, 0.882, .9);
 535                                                 /* the +/- adjustments are a hack to try to center the text in the circle
 536                                                  * TODO use pango get_pixel_size() -- see mono_panner.cc
 537                                                  */
 538                                                 if (small) {
 539                                                         cairo_move_to (cr, c.x - 1, c.y + 1);
 540                                                 } else {
 541                                                         cairo_move_to (cr, c.x - 4, c.y + 4);
 542                                                 }
 543                                                 cairo_show_text (cr, signal->text.c_str());
 544                                         }
 545                                 }
 546                         }
 547                 }
 548
 549                 /* speakers */
 550
 551                 int n = 0;
 552
 553                 for (Targets::iterator i = speakers.begin(); i != speakers.end(); ++i) {
 554                         Target *speaker = *i;
 555                         char buf[256];
 556                         ++n;
 557
 558                         if (speaker->visible) {
 559
 560                                 CartesianVector c;
 561
 562                                 speaker->position.cartesian (c);
 563                                 cart_to_gtk (c);
 564
 565                                 snprintf (buf, sizeof (buf), "%d", n);
 566
 567                                 /* stroke out a speaker shape */
 568
 569                                 cairo_move_to (cr, c.x, c.y);
 570                                 cairo_save (cr);
 571                                 cairo_rotate (cr, -(speaker->position.azi/360.0) * (2.0 * M_PI));
 572                                 if (small) {
 573                                         cairo_scale (cr, 0.8, 0.8);
 574                                 } else {
 575                                         cairo_scale (cr, 1.2, 1.2);
 576                                 }
 577                                 cairo_rel_line_to (cr, 4, -2);
 578                                 cairo_rel_line_to (cr, 0, -7);
 579                                 cairo_rel_line_to (cr, 5, +5);
 580                                 cairo_rel_line_to (cr, 5, 0);
 581                                 cairo_rel_line_to (cr, 0, 5);
 582                                 cairo_rel_line_to (cr, -5, 0);
 583                                 cairo_rel_line_to (cr, -5, +5);
 584                                 cairo_rel_line_to (cr, 0, -7);
 585                                 cairo_close_path (cr);
 586                                 cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
 587                                 cairo_fill (cr);
 588                                 cairo_restore (cr);
 589
 590                                 if (!small) {
 591                                         cairo_set_font_size (cr, 16);
 592
 593                                         /* move the text in just a bit */
 594
 595                                         AngularVector textpos (speaker->position.azi, speaker->position.ele, 0.85);
 596                                         textpos.cartesian (c);
 597                                         cart_to_gtk (c);
 598                                         cairo_move_to (cr, c.x, c.y);
 599                                         cairo_show_text (cr, buf);
 600                                 }
 601
 602                         }
 603                 }
 604         }
 605
 606         cairo_destroy (cr);
 607
 608         return true;
 609 }
 610
 611 bool
 612 Panner2d::on_button_press_event (GdkEventButton *ev)
 613 {
 614         GdkModifierType state;
 615         int x;
 616         int y;
 617         bool is_signal;
 618
 619         if (ev->type == GDK_2BUTTON_PRESS && ev->button == 1) {
 620                 return false;
 621         }
 622
 623         did_move = false;
 624
 625         switch (ev->button) {
 626         case 1:
 627         case 2:
 628                 x = ev->x - hoffset;
 629                 y = ev->y - voffset;
 630
 631                 if ((drag_target = find_closest_object (x, y, is_signal)) != 0) {
 632                         if (!is_signal) {
 633                                 panner_shell->panner()->set_position (drag_target->position.azi/360.0);
 634                                 drag_target = 0;
 635                         } else {
 636                                 drag_target->set_selected (true);
 637                         }
 638                 }
 639
 640                 state = (GdkModifierType) ev->state;
 641                 return handle_motion (ev->x, ev->y, state);
 642                 break;
 643
 644         default:
 645                 break;
 646         }
 647
 648         return false;
 649 }
 650
 651 bool
 652 Panner2d::on_button_release_event (GdkEventButton *ev)
 653 {
 654         gint x, y;
 655         GdkModifierType state;
 656         bool ret = false;
 657
 658         switch (ev->button) {
 659         case 1:
 660                 x = (int) floor (ev->x);
 661                 y = (int) floor (ev->y);
 662                 state = (GdkModifierType) ev->state;
 663                 ret = handle_motion (x, y, state);
 664                 drag_target = 0;
 665                 break;
 666
 667         case 2:
 668                 x = (int) floor (ev->x);
 669                 y = (int) floor (ev->y);
 670                 state = (GdkModifierType) ev->state;
 671
 672                 if (Keyboard::modifier_state_contains (state, Keyboard::TertiaryModifier)) {
 673                         toggle_bypass ();
 674                         ret = true;
 675                 } else {
 676                         ret = handle_motion (x, y, state);
 677                 }
 678
 679                 drag_target = 0;
 680                 break;
 681
 682         case 3:
 683                 break;
 684
 685         }
 686
 687         return ret;
 688 }
 689
 690 gint
 691 Panner2d::handle_motion (gint evx, gint evy, GdkModifierType state)
 692 {
 693         if (drag_target == 0) {
 694                 return false;
 695         }
 696
 697         if ((state & (GDK_BUTTON1_MASK|GDK_BUTTON2_MASK)) == 0) {
 698                 return false;
 699         }
 700
 701         evx -= hoffset;
 702         evy -= voffset;
 703
 704         if (state & GDK_BUTTON1_MASK && !(state & GDK_BUTTON2_MASK)) {
 705                 CartesianVector c;
 706                 bool need_move = false;
 707
 708                 drag_target->position.cartesian (c);
 709                 cart_to_gtk (c);
 710
 711                 if ((evx != c.x) || (evy != c.y)) {
 712                         need_move = true;
 713                 }
 714
 715                 if (need_move) {
 716                         CartesianVector cp (evx, evy, 0.0);
 717                         AngularVector av;
 718                         gtk_to_cart (cp);
 719
 720                         if (!have_elevation) {
 721                                 clamp_to_circle (cp.x, cp.y);
 722                                 cp.angular (av);
 723                                 if (drag_target == &position) {
 724                                         double degree_fract = av.azi / 360.0;
 725                                         panner_shell->panner()->set_position (degree_fract);
 726                                 }
 727                         } else {
 728                                 /* sphere projection */
 729                                 sphere_project (cp.x, cp.y, cp.z);
 730
 731                                 double r2d = 180.0 / M_PI;
 732                                 av.azi = r2d * atan2(cp.y, cp.x);
 733                                 av.ele = r2d * asin(cp.z);
 734
 735                                 if (drag_target == &position) {
 736                                         double azi_fract = av.azi / 360.0;
 737                                         double ele_fract = av.ele / 90.0;
 738                                         panner_shell->panner()->set_position (azi_fract);
 739                                         panner_shell->panner()->set_elevation (ele_fract);
 740                                 }
 741                         }
 742                 }
 743         }
 744
 745         return true;
 746 }
 747
 748 bool
 749 Panner2d::on_scroll_event (GdkEventScroll* ev)
 750 {
 751         switch (ev->direction) {
 752         case GDK_SCROLL_UP:
 753         case GDK_SCROLL_RIGHT:
 754                 panner_shell->panner()->set_position (panner_shell->pannable()->pan_azimuth_control->get_value() - 1.0/360.0);
 755                 break;
 756
 757         case GDK_SCROLL_DOWN:
 758         case GDK_SCROLL_LEFT:
 759                 panner_shell->panner()->set_position (panner_shell->pannable()->pan_azimuth_control->get_value() + 1.0/360.0);
 760                 break;
 761         }
 762         return true;
 763 }
 764
 765 void
 766 Panner2d::cart_to_gtk (CartesianVector& c) const
 767 {
 768         /* cartesian coordinate space:
 769               center = 0.0
 770               dimension = 2.0 * 2.0
 771               increasing y moves up
 772               so max values along each axis are -1..+1
 773
 774            GTK uses a coordinate space that is:
 775               top left = 0.0
 776               dimension = (radius*2.0) * (radius*2.0)
 777               increasing y moves down
 778         */
 779         const double diameter = radius*2.0;
 780
 781         c.x = diameter * ((c.x + 1.0) / 2.0);
 782         /* extra subtraction inverts the y-axis to match "increasing y moves down" */
 783         c.y = diameter - (diameter * ((c.y + 1.0) / 2.0));
 784 }
 785
 786 void
 787 Panner2d::gtk_to_cart (CartesianVector& c) const
 788 {
 789         const double diameter = radius*2.0;
 790         c.x = ((c.x / diameter) * 2.0) - 1.0;
 791         c.y = (((diameter - c.y) / diameter) * 2.0) - 1.0;
 792 }
 793
 794 void
 795 Panner2d::sphere_project (double& x, double& y, double& z)
 796 {
 797         double r, r2;
 798         r2 = x * x + y * y;
 799         if (r2 < 1.0) {
 800                 z = sqrt (1.0 - r2);
 801         } else {
 802                 r = sqrt (r2);
 803                 x = x / r;
 804                 y = y / r;
 805                 z = 0.0;
 806         }
 807 }
 808
 809 void
 810 Panner2d::clamp_to_circle (double& x, double& y)
 811 {
 812         double azi, ele;
 813         double z = 0.0;
 814         double l;
 815         PBD::cartesian_to_spherical (x, y, z, azi, ele, l);
 816         PBD::spherical_to_cartesian (azi, ele, 1.0, x, y, z);
 817 }
 818
 819 void
 820 Panner2d::toggle_bypass ()
 821 {
 822         panner_shell->set_bypassed (!panner_shell->bypassed());
 823 }
 824
 825 Panner2dWindow::Panner2dWindow (boost::shared_ptr<PannerShell> p, int32_t h, uint32_t inputs)
 826         : ArdourWindow (_("Panner (2D)"))
 827         , widget (p, h)
 828         , bypass_button (_("Bypass"))
 829         , width_adjustment (0, -100, 100, 1, 5, 0)
 830         , width_spinner (width_adjustment)
 831 {
 832         widget.set_name ("MixerPanZone");
 833
 834         set_title (_("Panner"));
 835         widget.set_size_request (h, h);
 836
 837         bypass_button.signal_toggled().connect (sigc::mem_fun (*this, &Panner2dWindow::bypass_toggled));
 838         width_spinner.signal_changed().connect (sigc::mem_fun (*this, &Panner2dWindow::width_changed));
 839
 840         p->pannable()->pan_width_control->Changed.connect (connections, invalidator(*this), boost::bind (&Panner2dWindow::set_width, this), gui_context());
 841         p->Changed.connect (connections, invalidator (*this), boost::bind (&Panner2dWindow::set_bypassed, this), gui_context());
 842
 843         button_box.set_spacing (6);
 844         button_box.pack_start (bypass_button, false, false);
 845
 846         left_side.set_spacing (6);
 847
 848         left_side.pack_start (button_box, false, false);
 849
 850         Gtk::Label* l = manage (new Label (
 851                                 p->panner()->describe_parameter(PanWidthAutomation),
 852                                 Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
 853         spinner_box.pack_start (*l, false, false);
 854         spinner_box.pack_start (width_spinner, false, false);
 855         left_side.pack_start (spinner_box, false, false);
 856
 857         l->show ();
 858         bypass_button.show ();
 859         button_box.show ();
 860         width_spinner.show ();
 861         spinner_box.show ();
 862         left_side.show ();
 863
 864         hpacker.set_spacing (6);
 865         hpacker.set_border_width (12);
 866         hpacker.pack_start (widget, false, false);
 867         hpacker.pack_start (left_side, false, false);
 868         hpacker.show ();
 869
 870         add (hpacker);
 871         reset (inputs);
 872         set_width();
 873         set_bypassed();
 874         widget.show ();
 875 }
 876
 877 void
 878 Panner2dWindow::reset (uint32_t n_inputs)
 879 {
 880         widget.reset (n_inputs);
 881 }
 882
 883 void
 884 Panner2dWindow::bypass_toggled ()
 885 {
 886         bool view = bypass_button.get_active ();
 887         bool model = widget.get_panner_shell()->bypassed ();
 888
 889         if (model != view) {
 890                 widget.get_panner_shell()->set_bypassed (view);
 891         }
 892 }
 893 void
 894 Panner2dWindow::width_changed ()
 895 {
 896         float model = widget.get_panner_shell()->pannable()->pan_width_control->get_value();
 897         float view  = width_spinner.get_value() / 100.0;
 898         if (model != view) {
 899                                         widget.get_panner_shell()->panner()->set_width (view);
 900                                 }
 901 }
 902
 903 void
 904 Panner2dWindow::set_bypassed ()
 905 {
 906         bool view = bypass_button.get_active ();
 907         bool model = widget.get_panner_shell()->bypassed ();
 908         if (model != view) {
 909                 bypass_button.set_active(model);
 910         }
 911
 912         set<Evoral::Parameter> params = widget.get_panner_shell()->panner()->what_can_be_automated();
 913         set<Evoral::Parameter>::iterator p = params.find(PanWidthAutomation);
 914         if (p == params.end()) {
 915                 spinner_box.set_sensitive(false);
 916         } else {
 917                 spinner_box.set_sensitive(true);
 918         }
 919 }
 920
 921 void
 922 Panner2dWindow::set_width ()
 923 {
 924         // rounding of spinbox is different from slider -- TODO use slider
 925         float model = (widget.get_panner_shell()->pannable()->pan_width_control->get_value() * 100.0);
 926         float view  = (width_spinner.get_value());
 927         if (model != view) {
 928                 width_spinner.set_value (model);
 929         }
 930 }
 931
 932 bool
 933 Panner2dWindow::on_key_press_event (GdkEventKey* event)
 934 {
 935         return relay_key_press (event, &PublicEditor::instance());
 936 }
 937
 938 bool
 939 Panner2dWindow::on_key_release_event (GdkEventKey*)
 940 {
 941         return true;
 942 }