1 // HUD_runway.cxx -- An instrument that renders a virtual runway on the HUD
3 // Written by Aaron Wilson & Phillip Merritt, Nov 2004.
5 // Copyright (C) 2004 Aaron Wilson, Aaron.I.Wilson@nasa.gov
6 // Copyright (C) 2004 Phillip Merritt, Phillip.M.Merritt@nasa.gov
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.
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.
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.
22 #include <simgear/compiler.h>
23 #include <simgear/math/sg_geodesy.hxx>
24 #include <simgear/math/polar3d.hxx>
27 #include <Main/globals.hxx>
28 #include <Scenery/scenery.hxx>
29 #include <Aircraft/aircraft.hxx>
30 #include <Environment/environment.hxx>
31 #include <Environment/environment_mgr.hxx>
32 #include <Main/viewer.hxx>
33 #include <Main/viewmgr.hxx>
34 #include <ATC/ATCutils.hxx>
39 HUD::Runway::Runway(HUD *hud, const SGPropertyNode *node, float x, float y) :
40 Item(hud, node, x, y),
41 _agl(fgGetNode("/position/altitude-agl-ft", true)),
42 _arrow_scale(node->getDoubleValue("arrow-scale", 1.0)),
43 _arrow_radius(node->getDoubleValue("arrow-radius")),
44 _line_scale(node->getDoubleValue("line-scale", 1.0)),
45 _scale_dist(node->getDoubleValue("scale-dist-nm")),
46 _default_pitch(fgGetDouble("/sim/view[0]/config/pitch-pitch-deg", 0.0)),
47 _default_heading(fgGetDouble("/sim/view[0]/config/pitch-heading-deg", 0.0)),
48 _cockpit_view(globals->get_viewmgr()->get_view(0)),
49 _stipple_out(node->getIntValue("outer_stipple", 0xFFFF)),
50 _stipple_center(node->getIntValue("center-stipple", 0xFFFF)),
51 _draw_arrow(_arrow_scale > 0 ? true : false),
52 _draw_arrow_always(_arrow_scale > 0 ? node->getBoolValue("arrow-always") : false)
59 _center.x = _view[2] / 2;
60 _center.y = _view[3] / 2;
62 _location.left = _center.x - (get_width() / 2) + get_x();
63 _location.right = _center.x + (get_width() / 2) + get_x();
64 _location.bottom = _center.y - (get_height() / 2) + get_y();
65 _location.top = _center.y + (get_height() / 2) + get_y();
69 void HUD::Runway::draw()
71 if (!get_active_runway(_runway))
74 glPushAttrib(GL_LINE_STIPPLE | GL_LINE_STIPPLE_PATTERN | GL_LINE_WIDTH);
75 float modelView[4][4], projMat[4][4];
77 //Get the current view
78 FGViewer* curr_view = globals->get_viewmgr()->get_current_view();
79 int curr_view_id = globals->get_viewmgr()->get_current();
80 double gpo = curr_view->getGoalPitchOffset_deg();
81 double gho = curr_view->getGoalHeadingOffset_deg();
82 double po = curr_view->getPitchOffset_deg();
83 double ho = curr_view->getHeadingOffset_deg();
85 double yaw = -(_cockpit_view->getHeadingOffset_deg() - _default_heading) * SG_DEGREES_TO_RADIANS;
86 double pitch = (_cockpit_view->getPitchOffset_deg() - _default_pitch) * SG_DEGREES_TO_RADIANS;
87 //double roll = fgGetDouble("/sim/view[0]/config/roll-offset-deg",0.0) //TODO: adjust for default roll offset
88 double sPitch = sin(pitch), cPitch = cos(pitch),
89 sYaw = sin(yaw), cYaw = cos(yaw);
91 //Assuming that the "Cockpit View" is always at position zero!!!
92 if (curr_view_id != 0) {
93 globals->get_viewmgr()->set_view(0);
94 globals->get_viewmgr()->copyToCurrent();
96 //Set the camera to the cockpit view to get the view of the runway from the cockpit
97 ssgSetCamera((sgVec4 *)_cockpit_view->get_VIEW());
98 get_rwy_points(_points3d);
99 //Get the current project matrix
100 ssgGetProjectionMatrix(projMat);
101 // const sgVec4 *viewMat = globals->get_current_view()->get_VIEW();
102 //Get the current model view matrix (cockpit view)
103 ssgGetModelviewMatrix(modelView);
104 //Create a rotation matrix to correct for any offsets (other than default offsets) to the model view matrix
105 sgMat4 xy; //rotation about the Rxy, negate the sin's on Ry
106 xy[0][0] = cYaw; xy[1][0] = 0.0f; xy[2][0] = -sYaw; xy[3][0] = 0.0f;
107 xy[0][1] = sPitch*-sYaw; xy[1][1] = cPitch; xy[2][1] = -sPitch*cYaw; xy[3][1] = 0.0f;
108 xy[0][2] = cPitch*sYaw; xy[1][2] = sPitch; xy[2][2] = cPitch*cYaw; xy[3][2] = 0.0f;
109 xy[0][3] = 0.0f; xy[1][3] = 0.0f; xy[2][3] = 0.0f; xy[3][3] = 1.0f;
110 //Re-center the model view
111 sgPostMultMat4(modelView,xy);
112 //copy float matrices to double
113 for (int i = 0; i < 4; i++) {
114 for (int j = 0; j < 4; j++) {
115 int idx = (i * 4) + j;
116 _mm[idx] = (double)modelView[i][j];
117 _pm[idx] = (double)projMat[i][j];
121 //Calculate the 2D points via gluProject
122 int result = GL_TRUE;
123 for (int i = 0; i < 6; i++) {
124 result = gluProject(_points3d[i][0], _points3d[i][1], _points3d[i][2], _mm,
125 _pm, _view, &_points2d[i][0], &_points2d[i][1], &_points2d[i][2]);
127 //set the line width based on our distance from the runway
129 //Draw the runway lines on the HUD
130 glEnable(GL_LINE_STIPPLE);
131 glLineStipple(1, _stipple_out);
133 drawLine(_points3d[0], _points3d[1], _points2d[0], _points2d[1]) | //draw top
134 drawLine(_points3d[2], _points3d[1], _points2d[2], _points2d[1]) | //draw right
135 drawLine(_points3d[2], _points3d[3], _points2d[2], _points2d[3]) | //draw bottom
136 drawLine(_points3d[3], _points3d[0], _points2d[3], _points2d[0]); //draw left
138 glLineStipple(1, _stipple_center);
139 anyLines |= drawLine(_points3d[5], _points3d[4], _points2d[5], _points2d[4]); //draw center
141 //Check to see if arrow needs drawn
142 if ((!anyLines && _draw_arrow) || _draw_arrow_always) {
143 drawArrow(); //draw indication arrow
146 //Restore the current view and any offsets
147 if (curr_view_id != 0) {
148 globals->get_viewmgr()->set_view(curr_view_id);
149 globals->get_viewmgr()->copyToCurrent();
150 curr_view->setHeadingOffset_deg(ho);
151 curr_view->setPitchOffset_deg(po);
152 curr_view->setGoalHeadingOffset_deg(gho);
153 curr_view->setGoalPitchOffset_deg(gpo);
155 //Set the camera back to the current view
156 ssgSetCamera((sgVec4 *)curr_view);
161 bool HUD::Runway::get_active_runway(FGRunway& runway)
163 FGEnvironment stationweather =
164 ((FGEnvironmentMgr *)globals->get_subsystem("environment"))->getEnvironment();
165 double hdg = stationweather.get_wind_from_heading_deg();
166 return globals->get_runways()->search(fgGetString("/sim/presets/airport-id"), int(hdg), &runway);
170 void HUD::Runway::get_rwy_points(sgdVec3 *_points3d)
172 static Point3D center = globals->get_scenery()->get_center();
174 //Get the current tile center
175 Point3D currentCenter = globals->get_scenery()->get_center();
176 Point3D tileCenter = currentCenter;
177 if (center != currentCenter) //if changing tiles
178 tileCenter = center; //use last center
180 double alt = current_aircraft.fdm_state->get_Runway_altitude() * SG_FEET_TO_METER;
181 double length = (_runway._length / 2.0) * SG_FEET_TO_METER;
182 double width = (_runway._width / 2.0) * SG_FEET_TO_METER;
183 double frontLat, frontLon, backLat, backLon,az, tempLat, tempLon;
185 geo_direct_wgs_84(alt, _runway._lat, _runway._lon, _runway._heading, length, &backLat, &backLon, &az);
186 sgGeodToCart(backLat * SG_DEGREES_TO_RADIANS, backLon * SG_DEGREES_TO_RADIANS, alt, _points3d[4]);
188 geo_direct_wgs_84(alt, _runway._lat, _runway._lon, _runway._heading + 180, length, &frontLat, &frontLon, &az);
189 sgGeodToCart(frontLat * SG_DEGREES_TO_RADIANS, frontLon * SG_DEGREES_TO_RADIANS, alt, _points3d[5]);
191 geo_direct_wgs_84(alt, backLat, backLon, _runway._heading + 90, width, &tempLat, &tempLon, &az);
192 sgGeodToCart(tempLat * SG_DEGREES_TO_RADIANS, tempLon * SG_DEGREES_TO_RADIANS, alt, _points3d[0]);
194 geo_direct_wgs_84(alt, backLat, backLon, _runway._heading - 90, width, &tempLat, &tempLon, &az);
195 sgGeodToCart(tempLat * SG_DEGREES_TO_RADIANS, tempLon * SG_DEGREES_TO_RADIANS, alt, _points3d[1]);
197 geo_direct_wgs_84(alt, frontLat, frontLon, _runway._heading - 90, width, &tempLat, &tempLon, &az);
198 sgGeodToCart(tempLat * SG_DEGREES_TO_RADIANS, tempLon * SG_DEGREES_TO_RADIANS, alt, _points3d[2]);
200 geo_direct_wgs_84(alt, frontLat, frontLon, _runway._heading + 90, width, &tempLat, &tempLon, &az);
201 sgGeodToCart(tempLat * SG_DEGREES_TO_RADIANS, tempLon * SG_DEGREES_TO_RADIANS, alt, _points3d[3]);
203 for (int i = 0; i < 6; i++) {
204 _points3d[i][0] -= tileCenter.x();
205 _points3d[i][1] -= tileCenter.y();
206 _points3d[i][2] -= tileCenter.z();
208 center = currentCenter;
212 bool HUD::Runway::drawLine(const sgdVec3& a1, const sgdVec3& a2, const sgdVec3& point1, const sgdVec3& point2)
215 sgdCopyVec3(p1, point1);
216 sgdCopyVec3(p2, point2);
217 bool p1Inside = (p1[0] >= _location.left && p1[0] <= _location.right
218 && p1[1] >= _location.bottom && p1[1] <= _location.top);
219 bool p1Insight = (p1[2] >= 0.0 && p1[2] < 1.0);
220 bool p1Valid = p1Insight && p1Inside;
221 bool p2Inside = (p2[0] >= _location.left && p2[0] <= _location.right
222 && p2[1] >= _location.bottom && p2[1] <= _location.top);
223 bool p2Insight = (p2[2] >= 0.0 && p2[2] < 1.0);
224 bool p2Valid = p2Insight && p2Inside;
226 if (p1Valid && p2Valid) { //Both project points are valid, draw the line
228 glVertex2d(p1[0],p1[1]);
229 glVertex2d(p2[0],p2[1]);
232 } else if (p1Valid) { //p1 is valid and p2 is not, calculate a new valid point
233 sgdVec3 vec = {a2[0] - a1[0], a2[1] - a1[1], a2[2] - a1[2]};
234 //create the unit vector
235 sgdScaleVec3(vec, 1.0 / sgdLengthVec3(vec));
237 sgdCopyVec3(newPt, a1);
238 sgdAddVec3(newPt, vec);
239 if (gluProject(newPt[0], newPt[1], newPt[2], _mm, _pm, _view, &p2[0], &p2[1], &p2[2])
240 && (p2[2] > 0 && p2[2] < 1.0)) {
243 glVertex2d(p1[0], p1[1]);
244 glVertex2d(p2[0], p2[1]);
248 } else if (p2Valid) { //p2 is valid and p1 is not, calculate a new valid point
249 sgdVec3 vec = {a1[0] - a2[0], a1[1] - a2[1], a1[2] - a2[2]};
250 //create the unit vector
251 sgdScaleVec3(vec, 1.0 / sgdLengthVec3(vec));
253 sgdCopyVec3(newPt, a2);
254 sgdAddVec3(newPt, vec);
255 if (gluProject(newPt[0], newPt[1], newPt[2], _mm, _pm, _view, &p1[0], &p1[1], &p1[2])
256 && (p1[2] > 0 && p1[2] < 1.0)) {
259 glVertex2d(p2[0], p2[1]);
260 glVertex2d(p1[0], p1[1]);
264 } else if (p1Insight && p2Insight) { //both points are insight, but not inside
265 bool v = boundOutsidePoints(p1, p2);
268 glVertex2d(p1[0], p1[1]);
269 glVertex2d(p2[0], p2[1]);
274 //else both points are not insight, don't draw anything
275 return (p1Valid && p2Valid);
279 void HUD::Runway::boundPoint(const sgdVec3& v, sgdVec3& m)
283 y = _location.bottom;
284 else if (m[1] > v[1])
289 return; //prevent divide by zero
292 double slope = (m[1] - v[1]) / (m[0] - v[0]);
293 m[0] = (y - v[1]) / slope + v[0];
296 if (m[0] < _location.left) {
297 m[0] = _location.left;
298 m[1] = slope * (_location.left - v[0]) + v[1];
300 } else if (m[0] > _location.right) {
301 m[0] = _location.right;
302 m[1] = slope * (_location.right - v[0]) + v[1];
307 bool HUD::Runway::boundOutsidePoints(sgdVec3& v, sgdVec3& m)
309 bool pointsInvalid = (v[1] > _location.top && m[1] > _location.top) ||
310 (v[1] < _location.bottom && m[1] < _location.bottom) ||
311 (v[0] > _location.right && m[0] > _location.right) ||
312 (v[0] < _location.left && m[0] < _location.left);
316 if (m[0] == v[0]) {//x's are equal, vertical line
318 m[1] = _location.top;
319 v[1] = _location.bottom;
321 v[1] = _location.top;
322 m[1] = _location.bottom;
327 if (m[1] == v[1]) { //y's are equal, horizontal line
329 m[0] = _location.right;
330 v[0] = _location.left;
332 v[0] = _location.right;
333 m[0] = _location.left;
338 double slope = (m[1] - v[1]) / (m[0] - v[0]);
339 double b = v[1] - (slope * v[0]);
340 double y1 = slope * _location.left + b;
341 double y2 = slope * _location.right + b;
342 double x1 = (_location.bottom - b) / slope;
343 double x2 = (_location.top - b) / slope;
346 if (y1 >= _location.bottom && y1 <= _location.top) {
347 v[0] = _location.left;
352 if (y2 >= _location.bottom && y2 <= _location.top) {
354 m[0] = _location.right;
357 v[0] = _location.right;
363 if (x1 >= _location.left && x1 <= _location.right) {
366 m[1] = _location.bottom;
369 v[1] = _location.bottom;
374 if (x2 >= _location.left && x2 <= _location.right) {
376 m[1] = _location.bottom;
379 return (counter == 2);
383 void HUD::Runway::drawArrow()
385 Point3D ac(0.0), rwy(0.0);
386 ac.setlat(current_aircraft.fdm_state->get_Latitude_deg());
387 ac.setlon(current_aircraft.fdm_state->get_Longitude_deg());
388 rwy.setlat(_runway._lat);
389 rwy.setlon(_runway._lon);
390 float theta = GetHeadingFromTo(ac, rwy);
391 theta -= fgGetDouble("/orientation/heading-deg");
393 glMatrixMode(GL_MODELVIEW);
395 glTranslated((_location.right + _location.left) / 2.0,(_location.top + _location.bottom) / 2.0, 0.0);
396 glRotated(theta, 0.0, 0.0, 1.0);
397 glTranslated(0.0, _arrow_radius, 0.0);
398 glScaled(_arrow_scale, _arrow_scale, 0.0);
400 glBegin(GL_TRIANGLES);
401 glVertex2d(-5.0, 12.5);
402 glVertex2d(0.0, 25.0);
403 glVertex2d(5.0, 12.5);
407 glVertex2d(-2.5, 0.0);
408 glVertex2d(-2.5, 12.5);
409 glVertex2d(2.5, 12.5);
410 glVertex2d(2.5, 0.0);
416 void HUD::Runway::setLineWidth()
418 //Calculate the distance from the runway, A
419 double course, distance;
420 calc_gc_course_dist(Point3D(_runway._lon * SGD_DEGREES_TO_RADIANS,
421 _runway._lat * SGD_DEGREES_TO_RADIANS, 0.0),
422 Point3D(current_aircraft.fdm_state->get_Longitude(),
423 current_aircraft.fdm_state->get_Latitude(), 0.0 ),
425 distance *= SG_METER_TO_NM;
426 //Get altitude above runway, B
427 double alt_nm = _agl->getDoubleValue();
429 if (_hud->getUnits() == FEET)
430 alt_nm *= SG_FEET_TO_METER;
432 alt_nm *= SG_METER_TO_NM;
434 //Calculate distance away from runway, C = v(A²+B²)
435 distance = sqrt(alt_nm * alt_nm + distance*distance);
436 if (distance < _scale_dist)
437 glLineWidth(1.0 + ((_line_scale - 1) * ((_scale_dist - distance) / _scale_dist)));