src/Instrumentation/HUD/HUD_ladder.cxx

   1 // HUD_ladder.cxx -- HUD Ladder Instrument
   2 //
   3 // Written by Michele America, started September 1997.
   4 //
   5 // Copyright (C) 1997  Michele F. America  [micheleamerica#geocities:com]
   6 // Copyright (C) 2006  Melchior FRANZ  [mfranz#aon:at]
   7 //
   8 // This program is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU General Public License as
  10 // published by the Free Software Foundation; either version 2 of the
  11 // License, or (at your option) any later version.
  12 //
  13 // This program is distributed in the hope that it will be useful, but
  14 // WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  21
  22 #ifdef HAVE_CONFIG_H
  23 #  include <config.h>
  24 #endif
  25
  26 #include <Main/viewer.hxx>
  27 #include "HUD.hxx"
  28
  29
  30 // FIXME
  31 float get__heading() { return fgGetFloat("/orientation/heading-deg") * M_PI / 180.0; }
  32 float get__throttleval() { return fgGetFloat("/controls/engines/engine/throttle"); }
  33 float get__Vx() { return fgGetFloat("/velocities/uBody-fps"); }
  34 float get__Vy() { return fgGetFloat("/velocities/vBody-fps"); }
  35 float get__Vz() { return fgGetFloat("/velocities/wBody-fps"); }
  36 float get__Ax() { return fgGetFloat("/acclerations/pilot/x-accel-fps_sec"); }
  37 float get__Ay() { return fgGetFloat("/acclerations/pilot/y-accel-fps_sec"); }
  38 float get__Az() { return fgGetFloat("/acclerations/pilot/z-accel-fps_sec"); }
  39 float get__alpha() { return fgGetFloat("/orientation/alpha-deg"); }
  40 float get__beta() { return fgGetFloat("/orientation/side-slip-deg"); }
  41 #undef ENABLE_SP_FDM
  42
  43
  44 HUD::Ladder::Ladder(HUD *hud, const SGPropertyNode *n, float x, float y) :
  45     Item(hud, n, x, y),
  46     _pitch(n->getNode("pitch-input", false)),
  47     _roll(n->getNode("roll-input", false)),
  48     _width_units(int(n->getFloatValue("display-span"))),
  49     _div_units(int(fabs(n->getFloatValue("divisions")))),
  50     _scr_hole(n->getIntValue("screen-hole")),
  51     _compression(n->getFloatValue("compression-factor")),
  52     _frl(n->getBoolValue("enable-fuselage-ref-line")),
  53     _target_spot(n->getBoolValue("enable-target-spot")),
  54     _target_markers(n->getBoolValue("enable-target-markers")),
  55     _velocity_vector(n->getBoolValue("enable-velocity-vector")),
  56     _drift_marker(n->getBoolValue("enable-drift-marker")),
  57     _alpha_bracket(n->getBoolValue("enable-alpha-bracket")),
  58     _energy_marker(n->getBoolValue("enable-energy-marker")),
  59     _climb_dive_marker(n->getBoolValue("enable-climb-dive-marker")),
  60     _glide_slope_marker(n->getBoolValue("enable-glide-slope-marker")),
  61     _glide_slope(n->getFloatValue("glide-slope", -4.0)),
  62     _energy_worm(n->getBoolValue("enable-energy-marker")),
  63     _waypoint_marker(n->getBoolValue("enable-waypoint-marker")),
  64     _zenith(n->getBoolValue("enable-zenith")),
  65     _nadir(n->getBoolValue("enable-nadir")),
  66     _hat(n->getBoolValue("enable-hat"))
  67 {
  68     const char *t = n->getStringValue("type");
  69     _type = strcmp(t, "climb-dive") ? PITCH : CLIMB_DIVE;
  70
  71     if (!_width_units)
  72         _width_units = 45;
  73
  74     _vmax = _width_units / 2;
  75     _vmin = -_vmax;
  76 }
  77
  78
  79 void HUD::Ladder::draw(void)
  80 {
  81     if (!_pitch.isValid() || !_roll.isValid())
  82         return;
  83
  84     float roll_value = _roll.getFloatValue() * SGD_DEGREES_TO_RADIANS;
  85     float pitch_value = _pitch.getFloatValue();
  86     float alpha;
  87
  88     bool pitch_ladder;
  89     bool climb_dive_ladder;
  90     bool clip_plane;
  91
  92     if (_type == CLIMB_DIVE) {
  93         pitch_ladder = false;
  94         climb_dive_ladder = true;
  95         clip_plane = true;
  96
  97     } else { // _type == PITCH
  98         pitch_ladder = true;
  99         climb_dive_ladder = false;
 100         clip_plane = false;
 101     }
 102
 103     //**************************************************************
 104     glPushMatrix();
 105     glTranslatef(_center_x, _center_y, 0);
 106
 107     // OBJECT STATIC RETICLE
 108     // TYPE FRL (FUSELAGE REFERENCE LINE)
 109     // ATTRIB - ALWAYS
 110     // Draw the FRL spot and line
 111     if (_frl) {
 112 #define FRL_DIAMOND_SIZE 2.0
 113         glBegin(GL_LINE_LOOP);
 114         glVertex2f(-FRL_DIAMOND_SIZE, 0.0);
 115         glVertex2f(0.0, FRL_DIAMOND_SIZE);
 116         glVertex2f(FRL_DIAMOND_SIZE, 0.0);
 117         glVertex2f(0.0, -FRL_DIAMOND_SIZE);
 118         glEnd();
 119
 120         glBegin(GL_LINE_STRIP);
 121         glVertex2f(0, FRL_DIAMOND_SIZE);
 122         glVertex2f(0, 8.0);
 123         glEnd();
 124 #undef FRL_DIAMOND_SIZE
 125     }
 126     // TYPE WATERLINE_MARK (W shaped _    _ )           // TODO (-> HUD_misc.cxx)
 127     //                                \/\/
 128
 129     //****************************************************************
 130     // TYPE TARGET_SPOT
 131     // Draw the target spot.
 132     if (_target_spot) {
 133 #define CENTER_DIAMOND_SIZE 6.0
 134         glBegin(GL_LINE_LOOP);
 135         glVertex2f(-CENTER_DIAMOND_SIZE, 0.0);
 136         glVertex2f(0.0, CENTER_DIAMOND_SIZE);
 137         glVertex2f(CENTER_DIAMOND_SIZE, 0.0);
 138         glVertex2f(0.0, -CENTER_DIAMOND_SIZE);
 139         glEnd();
 140 #undef CENTER_DIAMOND_SIZE
 141     }
 142
 143     //****************************************************************
 144     //velocity vector reticle - computations
 145     float xvvr, /* yvvr, */ Vxx = 0.0, Vyy = 0.0, Vzz = 0.0;
 146     float Axx = 0.0, Ayy = 0.0, Azz = 0.0, total_vel = 0.0, pot_slope, t1;
 147     float up_vel, ground_vel, actslope = 0.0, psi = 0.0;
 148     float vel_x = 0.0, vel_y = 0.0, drift;
 149
 150     if (_velocity_vector) {
 151         drift = get__beta();
 152         alpha = get__alpha();
 153
 154         Vxx = get__Vx();
 155         Vyy = get__Vy();
 156         Vzz = get__Vz();
 157         Axx = get__Ax();
 158         Ayy = get__Ay();
 159         Azz = get__Az();
 160         psi = get__heading();
 161
 162         if (psi > 180.0)
 163             psi = psi - 360;
 164
 165         total_vel = sqrt(Vxx * Vxx + Vyy * Vyy + Vzz * Vzz);
 166         ground_vel = sqrt(Vxx * Vxx + Vyy * Vyy);
 167         up_vel = Vzz;
 168
 169         if (ground_vel < 2.0) {
 170             if (fabs(up_vel) < 2.0)
 171                 actslope = 0.0;
 172             else
 173                 actslope = (up_vel / fabs(up_vel)) * 90.0;
 174
 175         } else {
 176             actslope = atan(up_vel / ground_vel) * SGD_RADIANS_TO_DEGREES;
 177         }
 178
 179         xvvr = (-drift * (_compression / globals->get_current_view()->get_aspect_ratio()));
 180         // drift = ((atan2(Vyy, Vxx) * SGD_RADIANS_TO_DEGREES) - psi);
 181         // yvvr = (-alpha * _compression);
 182         // vel_y = (-alpha * cos(roll_value) + drift * sin(roll_value)) * _compression;
 183         // vel_x = (alpha * sin(roll_value) + drift * cos(roll_value))
 184         //         * (_compression / globals->get_current_view()->get_aspect_ratio());
 185         vel_y = -alpha * _compression;
 186         vel_x = -drift * (_compression / globals->get_current_view()->get_aspect_ratio());
 187         //  printf("%f %f %f %f\n",vel_x, vel_y, drift, psi);
 188
 189         //****************************************************************
 190         // OBJECT MOVING RETICLE
 191         // TYPE - DRIFT MARKER
 192         // ATTRIB - ALWAYS
 193         // drift marker
 194         if (_drift_marker) {
 195             glBegin(GL_LINE_STRIP);
 196             glVertex2f((xvvr * 25 / 120) - 6, -4);
 197             glVertex2f(xvvr * 25 / 120, 8);
 198             glVertex2f((xvvr * 25 / 120) + 6, -4);
 199             glEnd();
 200         }
 201
 202         //****************************************************************
 203         // Clipping coordinates for ladder to be input from xml file
 204         // Clip hud ladder
 205         if (clip_plane) {
 206             GLdouble eqn_top[4] = {0.0, -1.0, 0.0, 0.0};
 207             GLdouble eqn_left[4] = {-1.0, 0.0, 0.0, 100.0};
 208             GLdouble eqn_right[4] = {1.0, 0.0, 0.0, 100.0};
 209
 210             glClipPlane(GL_CLIP_PLANE0, eqn_top);
 211             glEnable(GL_CLIP_PLANE0);
 212             glClipPlane(GL_CLIP_PLANE1, eqn_left);
 213             glEnable(GL_CLIP_PLANE1);
 214             glClipPlane(GL_CLIP_PLANE2, eqn_right);
 215             glEnable(GL_CLIP_PLANE2);
 216         }
 217
 218         //****************************************************************
 219         // OBJECT MOVING RETICLE
 220         // TYPE VELOCITY VECTOR
 221         // ATTRIB - ALWAYS
 222         // velocity vector
 223         draw_circle(vel_x, vel_y, 6);
 224
 225         //velocity vector reticle orientation lines
 226         glBegin(GL_LINE_STRIP);
 227         glVertex2f(vel_x - 12, vel_y);
 228         glVertex2f(vel_x - 6, vel_y);
 229         glEnd();
 230         glBegin(GL_LINE_STRIP);
 231         glVertex2f(vel_x + 12, vel_y);
 232         glVertex2f(vel_x + 6, vel_y);
 233         glEnd();
 234         glBegin(GL_LINE_STRIP);
 235         glVertex2f(vel_x, vel_y + 12);
 236         glVertex2f(vel_x, vel_y + 6);
 237         glEnd();
 238
 239 #ifdef ENABLE_SP_FDM
 240         int lgear = get__iaux3();
 241         int ihook = get__iaux6();
 242
 243         // OBJECT MOVING RETICLE
 244         // TYPE LINE
 245         // ATTRIB - ON CONDITION
 246         if (lgear == 1) {
 247             // undercarriage status
 248             glBegin(GL_LINE_STRIP);
 249             glVertex2f(vel_x + 8, vel_y);
 250             glVertex2f(vel_x + 8, vel_y - 4);
 251             glEnd();
 252
 253             // OBJECT MOVING RETICLE
 254             // TYPE LINE
 255             // ATTRIB - ON CONDITION
 256             glBegin(GL_LINE_STRIP);
 257             glVertex2f(vel_x - 8, vel_y);
 258             glVertex2f(vel_x - 8, vel_y - 4);
 259             glEnd();
 260
 261             // OBJECT MOVING RETICLE
 262             // TYPE LINE
 263             // ATTRIB - ON CONDITION
 264             glBegin(GL_LINE_STRIP);
 265             glVertex2f(vel_x, vel_y - 6);
 266             glVertex2f(vel_x, vel_y - 10);
 267             glEnd();
 268         }
 269
 270         // OBJECT MOVING RETICLE
 271         // TYPE V
 272         // ATTRIB - ON CONDITION
 273         if (ihook == 1) {
 274             // arrestor hook status
 275             glBegin(GL_LINE_STRIP);
 276             glVertex2f(vel_x - 4, vel_y - 8);
 277             glVertex2f(vel_x, vel_y - 10);
 278             glVertex2f(vel_x + 4, vel_y - 8);
 279             glEnd();
 280         }
 281 #endif
 282     } // if _velocity_vector
 283
 284     // draw hud markers on top of each AI/MP target
 285     if (_target_markers) {
 286         SGPropertyNode *models = globals->get_props()->getNode("/ai/models", true);
 287         for (int i = 0; i < models->nChildren(); i++) {
 288             SGPropertyNode *chld = models->getChild(i);
 289             string name;
 290             name = chld->getName();
 291             if (name == "aircraft" || name == "multiplayer") {
 292                 string callsign = chld->getStringValue("callsign");
 293                 if (callsign != "") {
 294                     float h_deg = chld->getFloatValue("radar/h-offset");
 295                     float v_deg = chld->getFloatValue("radar/v-offset");
 296                     float pos_x = (h_deg * cos(roll_value) -
 297                                    v_deg * sin(roll_value)) * _compression;
 298                     float pos_y = (v_deg * cos(roll_value) +
 299                                    h_deg * sin(roll_value)) * _compression;
 300                     draw_circle(pos_x, pos_y, 8);
 301                 }
 302             }
 303         }
 304     }
 305
 306     //***************************************************************
 307     // OBJECT MOVING RETICLE
 308     // TYPE - SQUARE_BRACKET
 309     // ATTRIB - ON CONDITION
 310     // alpha bracket
 311 #ifdef ENABLE_SP_FDM
 312     alpha = get__alpha();
 313
 314     if (_alpha_bracket && ihook == 1) {
 315         glBegin(GL_LINE_STRIP);
 316         glVertex2f(vel_x - 20, vel_y - (16 - alpha) * _compression);
 317         glVertex2f(vel_x - 17, vel_y - (16 - alpha) * _compression);
 318         glVertex2f(vel_x - 17, vel_y - (14 - alpha) * _compression);
 319         glVertex2f(vel_x - 20, vel_y - (14 - alpha) * _compression);
 320         glEnd();
 321
 322         glBegin(GL_LINE_STRIP);
 323         glVertex2f(vel_x + 20, vel_y - (16 - alpha) * _compression);
 324         glVertex2f(vel_x + 17, vel_y - (16 - alpha) * _compression);
 325         glVertex2f(vel_x + 17, vel_y - (14 - alpha) * _compression);
 326         glVertex2f(vel_x + 20, vel_y - (14 - alpha) * _compression);
 327         glEnd();
 328     }
 329 #endif
 330     //printf("xvr=%f, yvr=%f, Vx=%f, Vy=%f, Vz=%f\n",xvvr, yvvr, Vx, Vy, Vz);
 331     //printf("Ax=%f, Ay=%f, Az=%f\n",Ax, Ay, Az);
 332
 333     //****************************************************************
 334     // OBJECT MOVING RETICLE
 335     // TYPE ENERGY_MARKERS
 336     // ATTRIB - ALWAYS
 337     //energy markers - compute potential slope
 338     float pla = get__throttleval();
 339     float t2 = 0.0;
 340
 341     if (_energy_marker) {
 342         if (total_vel < 5.0) {
 343             t1 = 0;
 344             t2 = 0;
 345         } else {
 346             t1 = up_vel / total_vel;
 347             t2 = asin((Vxx * Axx + Vyy * Ayy + Vzz * Azz) / (9.81 * total_vel));
 348         }
 349         pot_slope = ((t2 / 3) * SGD_RADIANS_TO_DEGREES) * _compression + vel_y;
 350         // if (pot_slope < (vel_y - 45)) pot_slope = vel_y - 45;
 351         // if (pot_slope > (vel_y + 45)) pot_slope = vel_y + 45;
 352
 353         //energy markers
 354         glBegin(GL_LINE_STRIP);
 355         glVertex2f(vel_x - 20, pot_slope - 5);
 356         glVertex2f(vel_x - 15, pot_slope);
 357         glVertex2f(vel_x - 20, pot_slope + 5);
 358         glEnd();
 359
 360         glBegin(GL_LINE_STRIP);
 361         glVertex2f(vel_x + 20, pot_slope - 5);
 362         glVertex2f(vel_x + 15, pot_slope);
 363         glVertex2f(vel_x + 20, pot_slope + 5);
 364         glEnd();
 365
 366         if (pla > (105.0 / 131.0)) {
 367             glBegin(GL_LINE_STRIP);
 368             glVertex2f(vel_x - 24, pot_slope - 5);
 369             glVertex2f(vel_x - 19, pot_slope);
 370             glVertex2f(vel_x - 24, pot_slope + 5);
 371             glEnd();
 372
 373             glBegin(GL_LINE_STRIP);
 374             glVertex2f(vel_x + 24, pot_slope - 5);
 375             glVertex2f(vel_x + 19, pot_slope);
 376             glVertex2f(vel_x + 24, pot_slope + 5);
 377             glEnd();
 378         }
 379     }
 380
 381     //**********************************************************
 382     // ramp reticle
 383     // OBJECT STATIC RETICLE
 384     // TYPE LINE
 385     // ATTRIB - ON CONDITION
 386 #ifdef ENABLE_SP_FDM
 387     int ilcanclaw = get__iaux2();
 388
 389     if (_energy_worm && ilcanclaw == 1) {
 390         glBegin(GL_LINE_STRIP);
 391         glVertex2f(-15, -134);
 392         glVertex2f(15, -134);
 393         glEnd();
 394
 395         // OBJECT MOVING RETICLE
 396         // TYPE BOX
 397         // ATTRIB - ON CONDITION
 398         glBegin(GL_LINE_STRIP);
 399         glVertex2f(-6, -134);
 400         glVertex2f(-6, t2 * SGD_RADIANS_TO_DEGREES * 4.0 - 134);
 401         glVertex2f(+6, t2 * SGD_RADIANS_TO_DEGREES * 4.0 - 134);
 402         glVertex2f(6, -134);
 403         glEnd();
 404
 405         // OBJECT MOVING RETICLE
 406         // TYPE DIAMOND
 407         // ATTRIB - ON CONDITION
 408         glBegin(GL_LINE_LOOP);
 409         glVertex2f(-6, actslope * 4.0 - 134);
 410         glVertex2f(0, actslope * 4.0 -134 + 3);
 411         glVertex2f(6, actslope * 4.0 - 134);
 412         glVertex2f(0, actslope * 4.0 -134 -3);
 413         glEnd();
 414     }
 415 #endif
 416
 417     //*************************************************************
 418     // OBJECT MOVING RETICLE
 419     // TYPE DIAMOND
 420     // ATTRIB - ALWAYS
 421     // Draw the locked velocity vector.
 422     if (_climb_dive_marker) {
 423         glBegin(GL_LINE_LOOP);
 424         glVertex2f(-3.0, 0.0 + vel_y);
 425         glVertex2f(0.0, 6.0 + vel_y);
 426         glVertex2f(3.0, 0.0 + vel_y);
 427         glVertex2f(0.0, -6.0 + vel_y);
 428         glEnd();
 429     }
 430
 431     //****************************************************************
 432
 433     if (climb_dive_ladder) { // CONFORMAL_HUD
 434         _vmin = pitch_value - _width_units;
 435         _vmax = pitch_value + _width_units;
 436         glTranslatef(vel_x, vel_y, 0);
 437
 438     } else { // pitch_ladder - Default Hud
 439         _vmin = pitch_value - _width_units * 0.5f;
 440         _vmax = pitch_value + _width_units * 0.5f;
 441     }
 442
 443     glRotatef(roll_value * SGD_RADIANS_TO_DEGREES, 0.0, 0.0, 1.0);
 444     // FRL marker not rotated - this line shifted below
 445     float half_span = _w / 2.0;
 446     float y = 0;
 447     float x_ini, x_ini2;
 448     float x_end, x_end2;
 449
 450     if (_div_units) {
 451         const int BUFSIZE = 8;
 452         char buf[BUFSIZE];
 453         float label_length;
 454         float label_height;
 455         float left;
 456         float right;
 457         float bot;
 458         float top;
 459         float text_offset = 4.0f;
 460         float zero_offset = 0.0;
 461
 462         if (climb_dive_ladder)
 463             zero_offset = 50.0f; // horizon line is wider by this much (hard coded ??)
 464         else
 465             zero_offset = 10.0f;
 466
 467         fntFont *font = _hud->_font_renderer->getFont();                        // FIXME
 468         float pointsize = _hud->_font_renderer->getPointSize();
 469         float italic = _hud->_font_renderer->getSlant();
 470
 471         _locTextList.setFont(_hud->_font_renderer);
 472         _locTextList.erase();
 473         _locLineList.erase();
 474         _locStippleLineList.erase();
 475
 476         int last = int(_vmax) + 1;
 477         int i = int(_vmin);
 478
 479         if (!_scr_hole) {
 480             x_end = half_span;
 481
 482             for (; i < last; i++) {
 483                 y = (i - pitch_value) * _compression + .5f;
 484
 485                 if (!(i % _div_units)) {           //  At integral multiple of div
 486                     snprintf(buf, BUFSIZE, "%d", i);
 487                     font->getBBox(buf, pointsize, italic, &left, &right, &bot, &top);
 488                     label_length = right + left;
 489                     label_height = (top + bot) / 2.0f;
 490
 491                     x_ini = -half_span;
 492
 493                     if (i >= 0) {
 494                         // Make zero point wider on left
 495                         if (i == 0)
 496                             x_ini -= zero_offset;
 497
 498                         // Zero or above draw solid lines
 499                         draw_line(x_ini, y, x_end, y);
 500
 501                         if (i == 90 && _zenith)
 502                             draw_zenith(0.0, y);
 503                     } else {
 504                         // Below zero draw dashed lines.
 505                         draw_stipple_line(x_ini, y, x_end, y);
 506
 507                         if (i == -90 && _nadir)
 508                             draw_nadir(0.0, y);
 509                     }
 510
 511                     // Calculate the position of the left text and write it.
 512                     draw_text(x_ini - text_offset - label_length + 2.5/*hack*/, y - label_height, buf);
 513                     draw_text(x_end + text_offset, y - label_height, buf);
 514                 }
 515             }
 516
 517         } else { // if (_scr_hole)
 518             // Draw ladder with space in the middle of the lines
 519             float hole = _scr_hole / 2.0f;
 520
 521             x_end = -half_span + hole;
 522             x_ini2 = half_span - hole;
 523
 524             for (; i < last; i++) {
 525                 if (_type == PITCH)
 526                     y = float(i - pitch_value) * _compression + .5;
 527                 else // _type == CLIMB_DIVE
 528                     y = float(i - actslope) * _compression + .5;
 529
 530                 if (!(i % _div_units)) {  //  At integral multiple of div
 531                     snprintf(buf, BUFSIZE, "%d", i);
 532                     font->getBBox(buf, pointsize, italic, &left, &right, &bot, &top);
 533                     label_length = right + left;
 534                     label_height = (top + bot) / 2.0f;
 535                     //printf("%s -- l %f r %f b %f t %f\n", buf, left, right, bot, top);
 536
 537                     // Start by calculating the points and drawing the
 538                     // left side lines.
 539                     x_ini = -half_span;
 540                     x_end2 = half_span;
 541
 542                     if (i >= 0) {
 543                         // Make zero point wider on left
 544                         if (i == 0) {
 545                             x_ini -= zero_offset;
 546                             x_end2 += zero_offset;
 547                         }
 548                         //draw climb bar vertical lines
 549                         if (climb_dive_ladder) {
 550                             // Zero or above draw solid lines
 551                             draw_line(x_end, y - 5.0, x_end, y);
 552                             draw_line(x_ini2, y - 5.0, x_ini2, y);
 553                         }
 554                         // draw pitch / climb bar
 555                         draw_line(x_ini, y, x_end, y);
 556                         draw_line(x_ini2, y, x_end2, y);
 557
 558                         if (i == 90 && _zenith)
 559                             draw_zenith(0.0, y);
 560
 561                     } else { // i < 0
 562                         // draw dive bar vertical lines
 563                         if (climb_dive_ladder) {
 564                             draw_line(x_end, y + 5.0, x_end, y);
 565                             draw_line(x_ini2, y + 5.0, x_ini2, y);
 566                         }
 567
 568                         // draw pitch / dive bars
 569                         draw_stipple_line(x_ini, y, x_end, y);
 570                         draw_stipple_line(x_ini2, y, x_end2, y);
 571
 572                         if (i == -90 && _nadir)
 573                             draw_nadir(0.0, y);
 574                     }
 575
 576                     // Now calculate the location of the left side label using
 577                     draw_text(x_ini - text_offset - label_length + 2.5/*hack*/, y - label_height, buf);
 578                     draw_text(x_end2 + text_offset, y - label_height, buf);
 579                 }
 580             }
 581
 582             // OBJECT LADDER MARK
 583             // TYPE LINE
 584             // ATTRIB - ON CONDITION
 585             // draw appraoch glide slope marker
 586 #ifdef ENABLE_SP_FDM
 587             if (_glide_slope_marker && ihook) {
 588                 draw_line(-half_span + 15, (_glide_slope - actslope) * _compression,
 589                         -half_span + hole, (_glide_slope - actslope) * _compression);
 590                 draw_line(half_span - 15, (_glide_slope - actslope) * _compression,
 591                         half_span - hole, (_glide_slope - actslope) * _compression);
 592             }
 593 #endif
 594         }
 595         _locTextList.draw();
 596
 597         glLineWidth(0.2);
 598
 599         _locLineList.draw();
 600
 601         glEnable(GL_LINE_STIPPLE);
 602         glLineStipple(1, 0x00FF);
 603         _locStippleLineList.draw();
 604         glDisable(GL_LINE_STIPPLE);
 605     }
 606     glDisable(GL_CLIP_PLANE0);
 607     glDisable(GL_CLIP_PLANE1);
 608     glDisable(GL_CLIP_PLANE2);
 609     glPopMatrix();
 610     //*************************************************************
 611
 612     //*************************************************************
 613 #ifdef ENABLE_SP_FDM
 614     if (_waypoint_marker) {
 615         //waypoint marker computation
 616         float fromwp_lat, towp_lat, fromwp_lon, towp_lon, dist, delx, dely, hyp, theta, brg;
 617
 618         fromwp_lon = get__longitude() * SGD_DEGREES_TO_RADIANS;
 619         fromwp_lat = get__latitude() * SGD_DEGREES_TO_RADIANS;
 620         towp_lon = get__aux2() * SGD_DEGREES_TO_RADIANS;
 621         towp_lat = get__aux1() * SGD_DEGREES_TO_RADIANS;
 622
 623         dist = acos(sin(fromwp_lat) * sin(towp_lat) + cos(fromwp_lat)
 624                 * cos(towp_lat) * cos(fabs(fromwp_lon - towp_lon)));
 625         delx= towp_lat - fromwp_lat;
 626         dely = towp_lon - fromwp_lon;
 627         hyp = sqrt(pow(delx, 2) + pow(dely, 2));
 628
 629         if (hyp != 0)
 630             theta = asin(dely / hyp);
 631         else
 632             theta = 0.0;
 633
 634         brg = theta * SGD_RADIANS_TO_DEGREES;
 635         if (brg > 360.0)
 636             brg = 0.0;
 637         if (delx < 0)
 638             brg = 180 - brg;
 639
 640         // {Brg  = asin(cos(towp_lat)*sin(fabs(fromwp_lon-towp_lon))/ sin(dist));
 641         // Brg = Brg * SGD_RADIANS_TO_DEGREES; }
 642
 643         dist *= SGD_RADIANS_TO_DEGREES * 60.0 * 1852.0; //rad->deg->nm->m
 644         // end waypoint marker computation
 645
 646         //*********************************************************
 647         // OBJECT MOVING RETICLE
 648         // TYPE ARROW
 649         // waypoint marker
 650         if (fabs(brg - psi) > 10.0) {
 651             glPushMatrix();
 652             glTranslatef(_center_x, _center_y, 0);
 653             glTranslatef(vel_x, vel_y, 0);
 654             glRotatef(brg - psi, 0.0, 0.0, -1.0);
 655             glBegin(GL_LINE_LOOP);
 656             glVertex2f(-2.5, 20.0);
 657             glVertex2f(-2.5, 30.0);
 658             glVertex2f(-5.0, 30.0);
 659             glVertex2f(0.0, 35.0);
 660             glVertex2f(5.0, 30.0);
 661             glVertex2f(2.5, 30.0);
 662             glVertex2f(2.5, 20.0);
 663             glEnd();
 664             glPopMatrix();
 665         }
 666
 667         // waypoint marker on heading scale
 668         if (fabs(brg - psi) < 12.0) {
 669             if (!_hat) {
 670                 glBegin(GL_LINE_LOOP);
 671                 GLfloat x = (brg - psi) * 60 / 25;
 672                 glVertex2f(x + 320, 240.0);
 673                 glVertex2f(x + 326, 240.0 - 4);
 674                 glVertex2f(x + 323, 240.0 - 4);
 675                 glVertex2f(x + 323, 240.0 - 8);
 676                 glVertex2f(x + 317, 240.0 - 8);
 677                 glVertex2f(x + 317, 240.0 - 4);
 678                 glVertex2f(x + 314, 240.0 - 4);
 679                 glEnd();
 680
 681             } else { // if (_hat)
 682                 float x = (brg - psi) * 60 / 25 + 320, y = 240.0, r = 5.0;
 683                 float x1, y1;
 684
 685                 glEnable(GL_POINT_SMOOTH);
 686                 glBegin(GL_POINTS);
 687
 688                 for (int count = 0; count <= 200; count++) {
 689                     float temp = count * SG_PI * 3 / (200.0 * 2.0);
 690                     float temp1 = temp - (45.0 * SGD_DEGREES_TO_RADIANS);
 691                     x1 = x + r * cos(temp1);
 692                     y1 = y + r * sin(temp1);
 693                     glVertex2f(x1, y1);
 694                 }
 695
 696                 glEnd();
 697                 glDisable(GL_POINT_SMOOTH);
 698             }
 699
 700          } //brg<12
 701      } // if _waypoint_marker
 702 #endif
 703 }//draw
 704
 705
 706 /******************************************************************/
 707 //  draws the zenith symbol (highest possible climb angle i.e. 90 degree climb angle)
 708 //
 709 void HUD::Ladder::draw_zenith(float x, float y)
 710 {
 711     draw_line(x - 9.0, y, x - 3.0, y + 1.3);
 712     draw_line(x - 9.0, y, x - 3.0, y - 1.3);
 713
 714     draw_line(x + 9.0, y, x + 3.0, y + 1.3);
 715     draw_line(x + 9.0, y, x + 3.0, y - 1.3);
 716
 717     draw_line(x, y + 9.0, x - 1.3, y + 3.0);
 718     draw_line(x, y + 9.0, x + 1.3, y + 3.0);
 719
 720     draw_line(x - 3.9, y + 3.9, x - 3.0, y + 1.3);
 721     draw_line(x - 3.9, y + 3.9, x - 1.3, y + 3.0);
 722
 723     draw_line(x + 3.9, y + 3.9, x + 1.3, y + 3.0);
 724     draw_line(x + 3.9, y + 3.9, x + 3.0, y + 1.3);
 725
 726     draw_line(x - 3.9, y - 3.9, x - 3.0, y - 1.3);
 727     draw_line(x - 3.9, y - 3.9, x - 1.3, y - 2.6);
 728
 729     draw_line(x + 3.9, y - 3.9, x + 3.0, y - 1.3);
 730     draw_line(x + 3.9, y - 3.9, x + 1.3, y - 2.6);
 731
 732     draw_line(x - 1.3, y - 2.6, x, y - 27.0);
 733     draw_line(x + 1.3, y - 2.6, x, y - 27.0);
 734 }
 735
 736
 737 //  draws the nadir symbol (lowest possible dive angle i.e. 90 degree dive angle))
 738 //
 739 void HUD::Ladder::draw_nadir(float x, float y)
 740 {
 741     const float R = 7.5;
 742
 743     draw_circle(x, y, R);
 744     draw_line(x, y + R, x, y + 22.5); // line above the circle
 745     draw_line(x - R, y, x + R, y);    // line at middle of circle
 746
 747     float theta = asin(2.5 / R);
 748     float theta1 = asin(5.0 / R);
 749     float x1, y1, x2, y2;
 750
 751     x1 = x + R * cos(theta);
 752     y1 = y + 2.5;
 753     x2 = x + R * cos((180.0 * SGD_DEGREES_TO_RADIANS) - theta);
 754     y2 = y + 2.5;
 755     draw_line(x1, y1, x2, y2);
 756
 757     x1 = x + R * cos(theta1);
 758     y1 = y + 5.0;
 759     x2 = x + R * cos((180.0 * SGD_DEGREES_TO_RADIANS) - theta1);
 760     y2 = y + 5.0;
 761     draw_line(x1, y1, x2, y2);
 762
 763     x1 = x + R * cos((180.0 * SGD_DEGREES_TO_RADIANS) + theta);
 764     y1 = y - 2.5;
 765     x2 = x + R * cos((360.0 * SGD_DEGREES_TO_RADIANS) - theta);
 766     y2 = y - 2.5;
 767     draw_line(x1, y1, x2, y2);
 768
 769     x1 = x + R * cos((180.0 * SGD_DEGREES_TO_RADIANS) + theta1);
 770     y1 = y - 5.0;
 771     x2 = x + R * cos((360.0 * SGD_DEGREES_TO_RADIANS) - theta1);
 772     y2 = y - 5.0;
 773     draw_line(x1, y1, x2, y2);
 774 }
 775
 776