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