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 ARDOUR_UI_UTILS;
  48 using namespace PBD;
  49 using Gtkmm2ext::Keyboard;
  50
  51 static const int large_size_threshold = 100;
  52 static const int large_border_width = 25;
  53 static const int small_border_width = 8;
  54
  55 Panner2d::Target::Target (const AngularVector& a, const char *txt)
  56         : position (a)
  57         , text (txt)
  58         , _selected (false)
  59 {
  60 }
  61
  62 Panner2d::Target::~Target ()
  63 {
  64 }
  65
  66 void
  67 Panner2d::Target::set_text (const char* txt)
  68 {
  69         text = txt;
  70 }
  71
  72 Panner2d::Panner2d (boost::shared_ptr<PannerShell> p, int32_t h)
  73 : panner_shell (p)
  74         , position (AngularVector (0.0, 0.0), "")
  75         , width (0)
  76         , height (h)
  77         , last_width (0)
  78         , have_elevation (false)
  79         , _send_mode (false)
  80 {
  81         panner_shell->Changed.connect (panshell_connections, invalidator (*this), boost::bind (&Panner2d::handle_state_change, this), gui_context());
  82
  83         panner_shell->panner()->SignalPositionChanged.connect (panner_connections, invalidator(*this), boost::bind (&Panner2d::handle_position_change, this), gui_context());
  84
  85         drag_target = 0;
  86         set_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK);
  87
  88         handle_state_change ();
  89         handle_position_change ();
  90 }
  91
  92 Panner2d::~Panner2d()
  93 {
  94         for (Targets::iterator i = speakers.begin(); i != speakers.end(); ++i) {
  95                 delete *i;
  96         }
  97 }
  98
  99 void
 100 Panner2d::reset (uint32_t n_inputs)
 101 {
 102         uint32_t nouts = panner_shell->panner()->out().n_audio();
 103
 104         /* signals */
 105
 106         while (signals.size() < n_inputs) {
 107                 add_signal ("", AngularVector());
 108         }
 109
 110         if (signals.size() > n_inputs) {
 111                 for (uint32_t i = signals.size(); i < n_inputs; ++i) {
 112                         delete signals[i];
 113                 }
 114
 115                 signals.resize (n_inputs);
 116         }
 117
 118         label_signals ();
 119
 120         for (uint32_t i = 0; i < n_inputs; ++i) {
 121                 signals[i]->position = panner_shell->panner()->signal_position (i);
 122         }
 123
 124         /* add all outputs */
 125
 126         while (speakers.size() < nouts) {
 127                 add_speaker (AngularVector());
 128         }
 129
 130         if (speakers.size() > nouts) {
 131                 for (uint32_t i = nouts; i < speakers.size(); ++i) {
 132                         delete speakers[i];
 133                 }
 134
 135                 speakers.resize (nouts);
 136         }
 137
 138         for (Targets::iterator x = speakers.begin(); x != speakers.end(); ++x) {
 139                 (*x)->visible = false;
 140         }
 141
 142         vector<Speaker>& the_speakers (panner_shell->panner()->get_speakers()->speakers());
 143
 144         for (uint32_t n = 0; n < nouts; ++n) {
 145                 char buf[16];
 146
 147                 snprintf (buf, sizeof (buf), "%d", n+1);
 148                 speakers[n]->set_text (buf);
 149                 speakers[n]->position = the_speakers[n].angles();
 150                 speakers[n]->visible = true;
 151         }
 152
 153         queue_draw ();
 154 }
 155
 156 void
 157 Panner2d::on_size_allocate (Gtk::Allocation& alloc)
 158 {
 159         width = alloc.get_width();
 160         height = alloc.get_height();
 161
 162         if (height > large_size_threshold) {
 163                 border = large_border_width;
 164         } else {
 165                 border = small_border_width;
 166         }
 167
 168         radius = min (width, height);
 169         radius -= border;
 170         radius /= 2;
 171         radius = rint(radius) + .5;
 172
 173         hoffset = max ((double) (width - height), border);
 174         voffset = max ((double) (height - width), border);
 175
 176         hoffset = rint(hoffset / 2.0);
 177         voffset = rint(voffset / 2.0);
 178
 179         DrawingArea::on_size_allocate (alloc);
 180 }
 181
 182 int
 183 Panner2d::add_signal (const char* text, const AngularVector& a)
 184 {
 185         Target* signal = new Target (a, text);
 186         signals.push_back (signal);
 187         signal->visible = true;
 188
 189         return 0;
 190 }
 191
 192 int
 193 Panner2d::add_speaker (const AngularVector& a)
 194 {
 195         Target* speaker = new Target (a, "");
 196         speakers.push_back (speaker);
 197         speaker->visible = true;
 198         queue_draw ();
 199
 200         return speakers.size() - 1;
 201 }
 202
 203 void
 204 Panner2d::handle_state_change ()
 205 {
 206         panner_connections.drop_connections();
 207         if (!panner_shell->panner()) {
 208                 return;
 209         }
 210
 211         panner_shell->panner()->SignalPositionChanged.connect (panner_connections, invalidator(*this), boost::bind (&Panner2d::handle_position_change, this), gui_context());
 212
 213         set<Evoral::Parameter> params = panner_shell->panner()->what_can_be_automated();
 214         set<Evoral::Parameter>::iterator p = params.find(PanElevationAutomation);
 215         bool elev = have_elevation;
 216         have_elevation = (p == params.end()) ? false : true;
 217         if (elev != have_elevation) {
 218                 handle_position_change();
 219         }
 220         queue_draw ();
 221 }
 222
 223 void
 224 Panner2d::label_signals ()
 225 {
 226         uint32_t sz = signals.size();
 227
 228         switch (sz) {
 229                 case 0:
 230                         break;
 231
 232                 case 1:
 233                         signals[0]->set_text ("");
 234                         break;
 235
 236                 case 2:
 237                         signals[0]->set_text (_("L"));
 238                         signals[1]->set_text (_("R"));
 239                         break;
 240
 241                 default:
 242                         for (uint32_t i = 0; i < sz; ++i) {
 243                                 char buf[64];
 244                                 snprintf (buf, sizeof (buf), "%" PRIu32, i + 1);
 245                                 signals[i]->set_text (buf);
 246                         }
 247                         break;
 248         }
 249 }
 250
 251 void
 252 Panner2d::handle_position_change ()
 253 {
 254         uint32_t n;
 255         double w = panner_shell->pannable()->pan_width_control->get_value();
 256
 257         position.position = AngularVector (panner_shell->pannable()->pan_azimuth_control->get_value() * 360.0,
 258                         panner_shell->pannable()->pan_elevation_control->get_value() * 90.0);
 259
 260         for (uint32_t i = 0; i < signals.size(); ++i) {
 261                 signals[i]->position = panner_shell->panner()->signal_position (i);
 262         }
 263
 264         if (w * last_width <= 0) {
 265                 /* changed sign */
 266                 label_signals ();
 267         }
 268
 269         last_width = w;
 270
 271         vector<Speaker>& the_speakers (panner_shell->panner()->get_speakers()->speakers());
 272
 273         for (n = 0; n < speakers.size(); ++n) {
 274                 speakers[n]->position = the_speakers[n].angles();
 275         }
 276
 277         queue_draw ();
 278 }
 279
 280 void
 281 Panner2d::move_signal (int which, const AngularVector& a)
 282 {
 283         if (which >= int (speakers.size())) {
 284                 return;
 285         }
 286
 287         speakers[which]->position = a;
 288         queue_draw ();
 289 }
 290
 291 Panner2d::Target *
 292 Panner2d::find_closest_object (gdouble x, gdouble y, bool& is_signal)
 293 {
 294         Target *closest = 0;
 295         Target *candidate;
 296         float distance;
 297         float best_distance = FLT_MAX;
 298         CartesianVector c;
 299
 300         /* start with the position itself */
 301
 302         PBD::AngularVector dp = position.position;
 303         if (!have_elevation) dp.ele = 0;
 304         dp.azi = 270 - dp.azi;
 305         dp.cartesian (c);
 306
 307         cart_to_gtk (c);
 308         best_distance = sqrt ((c.x - x) * (c.x - x) +
 309                         (c.y - y) * (c.y - y));
 310         closest = &position;
 311
 312 #if 0 // TODO signal grab -> change width, not position
 313         for (Targets::const_iterator i = signals.begin(); i != signals.end(); ++i) {
 314                 candidate = *i;
 315
 316                 candidate->position.cartesian (c);
 317                 cart_to_gtk (c);
 318
 319                 distance = sqrt ((c.x - x) * (c.x - x) +
 320                                 (c.y - y) * (c.y - y));
 321
 322                 if (distance < best_distance) {
 323                         closest = candidate;
 324                         best_distance = distance;
 325                 }
 326         }
 327 #endif
 328
 329         is_signal = true;
 330
 331         if (height > large_size_threshold) {
 332                 /* "big" */
 333                 if (best_distance > 30) { // arbitrary
 334                         closest = 0;
 335                 }
 336         } else {
 337                 /* "small" */
 338                 if (best_distance > 10) { // arbitrary
 339                         closest = 0;
 340                 }
 341         }
 342
 343         /* if we didn't find a signal close by, check the speakers */
 344
 345         if (!closest) {
 346                 for (Targets::const_iterator i = speakers.begin(); i != speakers.end(); ++i) {
 347                         candidate = *i;
 348                         PBD::AngularVector sp = candidate->position;
 349                         sp.azi = 270 -sp.azi;
 350                         CartesianVector c;
 351                         sp.cartesian (c);
 352                         cart_to_gtk (c);
 353
 354                         distance = sqrt ((c.x - x) * (c.x - x) +
 355                                         (c.y - y) * (c.y - y));
 356
 357                         if (distance < best_distance) {
 358                                 closest = candidate;
 359                                 best_distance = distance;
 360                         }
 361                 }
 362
 363                 if (height > large_size_threshold) {
 364                         /* "big" */
 365                         if (best_distance < 30) { // arbitrary
 366                                 is_signal = false;
 367                         } else {
 368                                 closest = 0;
 369                         }
 370                 } else {
 371                         /* "small" */
 372                         if (best_distance < 10) { // arbitrary
 373                                 is_signal = false;
 374                         } else {
 375                                 closest = 0;
 376                         }
 377                 }
 378         }
 379
 380         return closest;
 381 }
 382
 383 void
 384 Panner2d::set_send_drawing_mode (bool onoff)
 385 {
 386         if (_send_mode != onoff) {
 387                 _send_mode = onoff;
 388                 queue_draw ();
 389         }
 390 }
 391
 392 bool
 393 Panner2d::on_motion_notify_event (GdkEventMotion *ev)
 394 {
 395         gint x, y;
 396         GdkModifierType state;
 397
 398         if (ev->is_hint) {
 399                 gdk_window_get_pointer (ev->window, &x, &y, &state);
 400         } else {
 401                 x = (int) floor (ev->x);
 402                 y = (int) floor (ev->y);
 403                 state = (GdkModifierType) ev->state;
 404         }
 405
 406         if (ev->state & (GDK_BUTTON1_MASK|GDK_BUTTON2_MASK)) {
 407                 did_move = true;
 408         }
 409
 410         return handle_motion (x, y, state);
 411 }
 412
 413 bool
 414 Panner2d::on_expose_event (GdkEventExpose *event)
 415 {
 416         CartesianVector c;
 417         cairo_t* cr;
 418         bool xsmall = (height <= large_size_threshold);
 419         const double diameter = radius*2.0;
 420
 421         cr = gdk_cairo_create (get_window()->gobj());
 422
 423         /* background */
 424
 425         cairo_rectangle (cr, event->area.x, event->area.y, event->area.width, event->area.height);
 426
 427         float r, g, b;
 428         r = g = b = 0.1;
 429         if (_send_mode) {
 430                 rgba_p_from_style("SendStripBase", &r, &g, &b, "fg");
 431         }
 432         if (!panner_shell->bypassed()) {
 433                 cairo_set_source_rgba (cr, r, g, b, 1.0);
 434         } else {
 435                 cairo_set_source_rgba (cr, r, g, b , 0.2);
 436         }
 437         cairo_fill_preserve (cr);
 438         cairo_clip (cr);
 439
 440         /* offset to give us some border */
 441
 442         cairo_translate (cr, hoffset, voffset);
 443
 444         cairo_set_line_width (cr, 1.0);
 445
 446         /* horizontal line of "crosshairs" */
 447
 448         cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
 449         cairo_move_to (cr, 0.0, radius);
 450         cairo_line_to (cr, diameter, radius);
 451         cairo_stroke (cr);
 452
 453         /* vertical line of "crosshairs" */
 454
 455         cairo_move_to (cr, radius, 0);
 456         cairo_line_to (cr, radius, diameter);
 457         cairo_stroke (cr);
 458
 459         /* the circle on which signals live */
 460
 461         cairo_set_line_width (cr, 1.5);
 462         cairo_set_source_rgba (cr, 0.517, 0.772, 0.882, 1.0);
 463         cairo_arc (cr, radius, radius, radius, 0.0, 2.0 * M_PI);
 464         cairo_stroke (cr);
 465
 466         for (uint32_t rad = 15; rad < 90; rad += 15) {
 467                 cairo_set_line_width (cr, .5 + (float)rad / 150.0);
 468                 if (rad == 45) {
 469                         cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
 470                 } else {
 471                         cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.8);
 472                 }
 473                 cairo_new_path (cr);
 474                 cairo_arc (cr, radius, radius, radius * sin(M_PI * (float) rad / 180.0), 0, 2.0 * M_PI);
 475                 cairo_stroke (cr);
 476         }
 477
 478         if (!panner_shell->bypassed()) {
 479                 /* convention top == front ^= azimuth == .5 (same as stereo/mono panners) */
 480
 481                 if (signals.size() > 1) {
 482                         /* arc to show "diffusion" */
 483
 484                         double width_angle = fabs (panner_shell->pannable()->pan_width_control->get_value()) * 2 * M_PI;
 485                         double position_angle = panner_shell->pannable()->pan_azimuth_control->get_value() * 2 * M_PI;
 486
 487                         cairo_save (cr);
 488                         cairo_translate (cr, radius, radius);
 489                         cairo_rotate (cr, M_PI / 2.0);
 490                         cairo_rotate (cr, position_angle - (width_angle/2.0));
 491                         cairo_move_to (cr, 0, 0);
 492                         cairo_arc_negative (cr, 0, 0, radius, width_angle, 0.0);
 493                         cairo_close_path (cr);
 494                         if (panner_shell->pannable()->pan_width_control->get_value() >= 0.0) {
 495                                 /* normal width */
 496                                 cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.45);
 497                         } else {
 498                                 /* inverse width */
 499                                 cairo_set_source_rgba (cr, 1.0, 0.419, 0.419, 0.45);
 500                         }
 501                         cairo_fill (cr);
 502                         cairo_restore (cr);
 503                 }
 504
 505                 double arc_radius;
 506
 507                 cairo_select_font_face (cr, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
 508
 509                 if (xsmall) {
 510                         arc_radius = 4.0;
 511                 } else {
 512                         cairo_set_font_size (cr, 10);
 513                         arc_radius = 12.0;
 514                 }
 515
 516                 /* draw position */
 517
 518                 PBD::AngularVector dp = position.position;
 519                 if (!have_elevation) dp.ele = 0;
 520                 dp.azi = 270 - dp.azi;
 521                 dp.cartesian (c);
 522                 cart_to_gtk (c);
 523
 524                 cairo_new_path (cr);
 525                 cairo_arc (cr, c.x, c.y, arc_radius + 1.0, 0, 2.0 * M_PI);
 526                 cairo_set_source_rgba (cr, 1.0, 0.419, 0.419, 0.85);
 527                 cairo_fill_preserve (cr);
 528                 cairo_set_source_rgba (cr, 1.0, 0.905, 0.905, 0.85);
 529                 cairo_stroke (cr);
 530
 531                 /* signals */
 532
 533                 if (signals.size() > 0) {
 534                         for (Targets::iterator i = signals.begin(); i != signals.end(); ++i) {
 535                                 Target* signal = *i;
 536
 537                                 if (signal->visible) {
 538
 539                                         /* TODO check for overlap - multiple src at same position
 540                                          * -> visualize it properly
 541                                          */
 542                                         PBD::AngularVector sp = signal->position;
 543                                         if (!have_elevation) sp.ele = 0;
 544                                         sp.azi += 270.0;
 545                                         sp.cartesian (c);
 546                                         cart_to_gtk (c);
 547
 548                                         cairo_new_path (cr);
 549                                         cairo_arc (cr, c.x, c.y, arc_radius, 0, 2.0 * M_PI);
 550                                         cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.75);
 551                                         cairo_fill_preserve (cr);
 552                                         cairo_set_source_rgba (cr, 0.517, 0.772, 0.882, 0.8);
 553                                         cairo_stroke (cr);
 554
 555                                         if (!xsmall && !signal->text.empty()) {
 556                                                 cairo_set_source_rgba (cr, 0.517, 0.772, 0.882, .9);
 557                                                 /* the +/- adjustments are a hack to try to center the text in the circle
 558                                                  * TODO use pango get_pixel_size() -- see mono_panner.cc
 559                                                  */
 560                                                 if (xsmall) {
 561                                                         cairo_move_to (cr, c.x - 1, c.y + 1);
 562                                                 } else {
 563                                                         cairo_move_to (cr, c.x - 4, c.y + 4);
 564                                                 }
 565                                                 cairo_show_text (cr, signal->text.c_str());
 566                                         }
 567                                 }
 568                         }
 569                 }
 570
 571                 /* speakers */
 572
 573                 int n = 0;
 574
 575                 for (Targets::iterator i = speakers.begin(); i != speakers.end(); ++i) {
 576                         Target *speaker = *i;
 577                         char buf[256];
 578                         ++n;
 579
 580                         if (speaker->visible) {
 581
 582                                 PBD::AngularVector sp = speaker->position;
 583                                 sp.azi += 270.0;
 584                                 CartesianVector c;
 585                                 sp.cartesian (c);
 586                                 cart_to_gtk (c);
 587
 588                                 snprintf (buf, sizeof (buf), "%d", n);
 589
 590                                 /* stroke out a speaker shape */
 591
 592                                 cairo_move_to (cr, c.x, c.y);
 593                                 cairo_save (cr);
 594                                 cairo_rotate (cr, -(sp.azi/360.0) * (2.0 * M_PI));
 595                                 if (xsmall) {
 596                                         cairo_scale (cr, 0.8, 0.8);
 597                                 } else {
 598                                         cairo_scale (cr, 1.2, 1.2);
 599                                 }
 600                                 cairo_rel_line_to (cr, 4, -2);
 601                                 cairo_rel_line_to (cr, 0, -7);
 602                                 cairo_rel_line_to (cr, 5, +5);
 603                                 cairo_rel_line_to (cr, 5, 0);
 604                                 cairo_rel_line_to (cr, 0, 5);
 605                                 cairo_rel_line_to (cr, -5, 0);
 606                                 cairo_rel_line_to (cr, -5, +5);
 607                                 cairo_rel_line_to (cr, 0, -7);
 608                                 cairo_close_path (cr);
 609                                 cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
 610                                 cairo_fill (cr);
 611                                 cairo_restore (cr);
 612
 613                                 if (!xsmall) {
 614                                         cairo_set_font_size (cr, 16);
 615
 616                                         /* move the text in just a bit */
 617
 618                                         AngularVector textpos (speaker->position.azi + 270.0, speaker->position.ele, 0.85);
 619
 620                                         textpos.cartesian (c);
 621                                         cart_to_gtk (c);
 622                                         cairo_move_to (cr, c.x, c.y);
 623                                         cairo_show_text (cr, buf);
 624                                 }
 625
 626                         }
 627                 }
 628         }
 629
 630         cairo_destroy (cr);
 631
 632         return true;
 633 }
 634
 635 bool
 636 Panner2d::on_button_press_event (GdkEventButton *ev)
 637 {
 638         GdkModifierType state;
 639         int x;
 640         int y;
 641         bool is_signal;
 642
 643         if (ev->type == GDK_2BUTTON_PRESS && ev->button == 1) {
 644                 return false;
 645         }
 646
 647         did_move = false;
 648
 649         switch (ev->button) {
 650         case 1:
 651         case 2:
 652                 x = ev->x - hoffset;
 653                 y = ev->y - voffset;
 654
 655                 if ((drag_target = find_closest_object (x, y, is_signal)) != 0) {
 656                         if (!is_signal) {
 657                                 panner_shell->panner()->set_position (drag_target->position.azi/360.0);
 658                                 drag_target = 0;
 659                         } else {
 660                                 drag_target->set_selected (true);
 661                         }
 662                 }
 663
 664                 state = (GdkModifierType) ev->state;
 665                 return handle_motion (ev->x, ev->y, state);
 666                 break;
 667
 668         default:
 669                 break;
 670         }
 671
 672         return false;
 673 }
 674
 675 bool
 676 Panner2d::on_button_release_event (GdkEventButton *ev)
 677 {
 678         gint x, y;
 679         GdkModifierType state;
 680         bool ret = false;
 681
 682         switch (ev->button) {
 683         case 1:
 684                 x = (int) floor (ev->x);
 685                 y = (int) floor (ev->y);
 686                 state = (GdkModifierType) ev->state;
 687                 ret = handle_motion (x, y, state);
 688                 drag_target = 0;
 689                 break;
 690
 691         case 2:
 692                 x = (int) floor (ev->x);
 693                 y = (int) floor (ev->y);
 694                 state = (GdkModifierType) ev->state;
 695
 696                 if (Keyboard::modifier_state_contains (state, Keyboard::TertiaryModifier)) {
 697                         toggle_bypass ();
 698                         ret = true;
 699                 } else {
 700                         ret = handle_motion (x, y, state);
 701                 }
 702
 703                 drag_target = 0;
 704                 break;
 705
 706         case 3:
 707                 break;
 708
 709         }
 710
 711         return ret;
 712 }
 713
 714 gint
 715 Panner2d::handle_motion (gint evx, gint evy, GdkModifierType state)
 716 {
 717         if (drag_target == 0) {
 718                 return false;
 719         }
 720
 721         if ((state & (GDK_BUTTON1_MASK|GDK_BUTTON2_MASK)) == 0) {
 722                 return false;
 723         }
 724
 725         evx -= hoffset;
 726         evy -= voffset;
 727
 728         if (state & GDK_BUTTON1_MASK && !(state & GDK_BUTTON2_MASK)) {
 729                 CartesianVector c;
 730                 bool need_move = false;
 731
 732                 drag_target->position.cartesian (c);
 733                 cart_to_gtk (c);
 734
 735                 if ((evx != c.x) || (evy != c.y)) {
 736                         need_move = true;
 737                 }
 738
 739                 if (need_move) {
 740                         CartesianVector cp (evx, evy, 0.0);
 741                         AngularVector av;
 742                         gtk_to_cart (cp);
 743
 744                         if (!have_elevation) {
 745                                 clamp_to_circle (cp.x, cp.y);
 746                                 cp.angular (av);
 747                                 av.azi = fmod(270 - av.azi, 360);
 748                                 if (drag_target == &position) {
 749                                         double degree_fract = av.azi / 360.0;
 750                                         panner_shell->panner()->set_position (degree_fract);
 751                                 }
 752                         } else {
 753                                 /* sphere projection */
 754                                 sphere_project (cp.x, cp.y, cp.z);
 755
 756                                 double r2d = 180.0 / M_PI;
 757                                 av.azi = r2d * atan2(cp.y, cp.x);
 758                                 av.ele = r2d * asin(cp.z);
 759                                 av.azi = fmod(270 - av.azi, 360);
 760
 761                                 if (drag_target == &position) {
 762                                         double azi_fract = av.azi / 360.0;
 763                                         double ele_fract = av.ele / 90.0;
 764                                         panner_shell->panner()->set_position (azi_fract);
 765                                         panner_shell->panner()->set_elevation (ele_fract);
 766                                 }
 767                         }
 768                 }
 769         }
 770
 771         return true;
 772 }
 773
 774 bool
 775 Panner2d::on_scroll_event (GdkEventScroll* ev)
 776 {
 777         switch (ev->direction) {
 778         case GDK_SCROLL_UP:
 779         case GDK_SCROLL_RIGHT:
 780                 panner_shell->panner()->set_position (panner_shell->pannable()->pan_azimuth_control->get_value() - 1.0/360.0);
 781                 break;
 782
 783         case GDK_SCROLL_DOWN:
 784         case GDK_SCROLL_LEFT:
 785                 panner_shell->panner()->set_position (panner_shell->pannable()->pan_azimuth_control->get_value() + 1.0/360.0);
 786                 break;
 787         }
 788         return true;
 789 }
 790
 791 void
 792 Panner2d::cart_to_gtk (CartesianVector& c) const
 793 {
 794         /* cartesian coordinate space:
 795               center = 0.0
 796               dimension = 2.0 * 2.0
 797               increasing y moves up
 798               so max values along each axis are -1..+1
 799
 800            GTK uses a coordinate space that is:
 801               top left = 0.0
 802               dimension = (radius*2.0) * (radius*2.0)
 803               increasing y moves down
 804         */
 805         const double diameter = radius*2.0;
 806
 807         c.x = diameter * ((c.x + 1.0) / 2.0);
 808         /* extra subtraction inverts the y-axis to match "increasing y moves down" */
 809         c.y = diameter - (diameter * ((c.y + 1.0) / 2.0));
 810 }
 811
 812 void
 813 Panner2d::gtk_to_cart (CartesianVector& c) const
 814 {
 815         const double diameter = radius*2.0;
 816         c.x = ((c.x / diameter) * 2.0) - 1.0;
 817         c.y = (((diameter - c.y) / diameter) * 2.0) - 1.0;
 818 }
 819
 820 void
 821 Panner2d::sphere_project (double& x, double& y, double& z)
 822 {
 823         double r, r2;
 824         r2 = x * x + y * y;
 825         if (r2 < 1.0) {
 826                 z = sqrt (1.0 - r2);
 827         } else {
 828                 r = sqrt (r2);
 829                 x = x / r;
 830                 y = y / r;
 831                 z = 0.0;
 832         }
 833 }
 834
 835 void
 836 Panner2d::clamp_to_circle (double& x, double& y)
 837 {
 838         double azi, ele;
 839         double z = 0.0;
 840         double l;
 841         PBD::cartesian_to_spherical (x, y, z, azi, ele, l);
 842         PBD::spherical_to_cartesian (azi, ele, 1.0, x, y, z);
 843 }
 844
 845 void
 846 Panner2d::toggle_bypass ()
 847 {
 848         panner_shell->set_bypassed (!panner_shell->bypassed());
 849 }
 850
 851 Panner2dWindow::Panner2dWindow (boost::shared_ptr<PannerShell> p, int32_t h, uint32_t inputs)
 852         : ArdourWindow (_("Panner (2D)"))
 853         , widget (p, h)
 854         , bypass_button (_("Bypass"))
 855         , width_adjustment (0, -100, 100, 1, 5, 0)
 856         , width_spinner (width_adjustment)
 857 {
 858         widget.set_name ("MixerPanZone");
 859
 860         set_title (_("Panner"));
 861         widget.set_size_request (h, h);
 862
 863         bypass_button.signal_toggled().connect (sigc::mem_fun (*this, &Panner2dWindow::bypass_toggled));
 864         width_spinner.signal_changed().connect (sigc::mem_fun (*this, &Panner2dWindow::width_changed));
 865
 866         p->Changed.connect (panshell_connections, invalidator (*this), boost::bind (&Panner2dWindow::set_bypassed, this), gui_context());
 867         /* needed for the width-spinbox in the main window */
 868         p->PannableChanged.connect (panshell_connections, invalidator (*this), boost::bind (&Panner2dWindow::pannable_handler, this), gui_context());
 869         p->pannable()->pan_width_control->Changed.connect (panvalue_connections, invalidator(*this), boost::bind (&Panner2dWindow::set_width, this), gui_context());
 870
 871
 872         button_box.set_spacing (6);
 873         button_box.pack_start (bypass_button, false, false);
 874
 875         left_side.set_spacing (6);
 876
 877         left_side.pack_start (button_box, false, false);
 878
 879         Gtk::Label* l = manage (new Label (
 880                                 p->panner()->describe_parameter(PanWidthAutomation),
 881                                 Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER, false));
 882         spinner_box.pack_start (*l, false, false);
 883         spinner_box.pack_start (width_spinner, false, false);
 884         left_side.pack_start (spinner_box, false, false);
 885
 886         l->show ();
 887         bypass_button.show ();
 888         button_box.show ();
 889         width_spinner.show ();
 890         spinner_box.show ();
 891         left_side.show ();
 892
 893         hpacker.set_spacing (6);
 894         hpacker.set_border_width (12);
 895         hpacker.pack_start (widget, false, false);
 896         hpacker.pack_start (left_side, false, false);
 897         hpacker.show ();
 898
 899         add (hpacker);
 900         reset (inputs);
 901         set_width();
 902         set_bypassed();
 903         widget.show ();
 904 }
 905
 906 void
 907 Panner2dWindow::reset (uint32_t n_inputs)
 908 {
 909         widget.reset (n_inputs);
 910 }
 911
 912 void
 913 Panner2dWindow::bypass_toggled ()
 914 {
 915         bool view = bypass_button.get_active ();
 916         bool model = widget.get_panner_shell()->bypassed ();
 917
 918         if (model != view) {
 919                 widget.get_panner_shell()->set_bypassed (view);
 920         }
 921 }
 922 void
 923 Panner2dWindow::width_changed ()
 924 {
 925         float model = widget.get_panner_shell()->pannable()->pan_width_control->get_value();
 926         float view  = width_spinner.get_value() / 100.0;
 927         if (model != view) {
 928                 widget.get_panner_shell()->panner()->set_width (view);
 929         }
 930 }
 931
 932 void
 933 Panner2dWindow::pannable_handler ()
 934 {
 935         panvalue_connections.drop_connections();
 936         widget.get_panner_shell()->pannable()->pan_width_control->Changed.connect (panvalue_connections, invalidator(*this), boost::bind (&Panner2dWindow::set_width, this), gui_context());
 937         set_width();
 938 }
 939
 940 void
 941 Panner2dWindow::set_bypassed ()
 942 {
 943         bool view = bypass_button.get_active ();
 944         bool model = widget.get_panner_shell()->bypassed ();
 945         if (model != view) {
 946                 bypass_button.set_active(model);
 947         }
 948
 949         set<Evoral::Parameter> params = widget.get_panner_shell()->panner()->what_can_be_automated();
 950         set<Evoral::Parameter>::iterator p = params.find(PanWidthAutomation);
 951         if (p == params.end()) {
 952                 spinner_box.set_sensitive(false);
 953         } else {
 954                 spinner_box.set_sensitive(true);
 955         }
 956 }
 957
 958 void
 959 Panner2dWindow::set_width ()
 960 {
 961         // rounding of spinbox is different from slider -- TODO use slider
 962         float model = (widget.get_panner_shell()->pannable()->pan_width_control->get_value() * 100.0);
 963         float view  = (width_spinner.get_value());
 964         if (model != view) {
 965                 width_spinner.set_value (model);
 966         }
 967 }
 968
 969 bool
 970 Panner2dWindow::on_key_press_event (GdkEventKey* event)
 971 {
 972         return relay_key_press (event, &PublicEditor::instance());
 973 }
 974
 975 bool
 976 Panner2dWindow::on_key_release_event (GdkEventKey*)
 977 {
 978         return true;
 979 }