2 // getapt.cxx -- generate airport scenery from the given definition file
4 // Written by Curtis Olson, started September 1998.
6 // Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
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., 675 Mass Ave, Cambridge, MA 02139, USA.
23 // (Log is kept at end of this file)
26 #include <string> // Standard C++ string library
28 #include "Include/fg_stl_config.h"
30 #ifdef NEEDNAMESPACESTD
34 #include <Debug/fg_debug.h>
35 #include <Include/fg_types.h>
36 #include <Math/fg_geodesy.h>
37 #include <Math/mat3.h>
38 #include <Math/polar3d.hxx>
39 #include <Misc/fgstream.hxx>
40 #include <Objects/material.hxx>
42 // #include <gpc/gpc.h>
47 typedef vector < fgPoint3d > container;
48 typedef container::iterator iterator;
49 typedef container::const_iterator const_iterator;
52 // Calculate distance between to fgPoint3d's
53 static double calc_dist(const fgPoint3d& p1, const fgPoint3d& p2) {
58 return sqrt(x*x + y*y + z*z);
62 // convert a geodetic point lon(degrees), lat(degrees), elev(meter) to a
64 static fgPoint3d geod_to_cart(fgPoint3d geod) {
69 // printf("A geodetic point is (%.2f, %.2f, %.2f)\n", geod[0],
72 geoc.lon = geod.lon*DEG_TO_RAD;
73 fgGeodToGeoc(geod.lat*DEG_TO_RAD, geod.radius, &sl_radius, &geoc.lat);
75 // printf("A geocentric point is (%.2f, %.2f, %.2f)\n", gc_lon,
76 // gc_lat, sl_radius+geod[2]); */
78 geoc.radius = sl_radius + geod.radius;
79 cart = fgPolarToCart3d(geoc);
81 // printf("A cart point is (%.8f, %.8f, %.8f)\n", cp.x, cp.y, cp.z);
87 #define FG_APT_BASE_TEX_CONSTANT 2000.0
89 // Calculate texture coordinates for a given point.
91 calc_tex_coords(const fgPoint3d& p) {
94 cout << "Texture coordinates = " <<
95 FG_APT_BASE_TEX_CONSTANT * p.lon << " " <<
96 FG_APT_BASE_TEX_CONSTANT * p.lat << "\n";
98 tex.x = fmod(FG_APT_BASE_TEX_CONSTANT * p.lon, 10.0);
99 tex.y = fmod(FG_APT_BASE_TEX_CONSTANT * p.lat, 10.0);
109 cout << "Texture coordinates = " << tex.x << " " << tex.y << "\n";
115 // generate the actual base area for the airport
117 gen_base( const fgPoint3d& average, const container& perimeter, fgTILE *t)
120 fgPoint3d ave_cart, cart, cart_trans, tex;
122 double dist, max_dist, temp;
129 cout << "generating airport base for size = " << perimeter.size() << "\n";
132 fragment.tile_ptr = t;
134 // find airport base material in the properties list
135 if ( ! material_mgr.find( APT_BASE_MATERIAL, fragment.material_ptr )) {
136 fgPrintf( FG_TERRAIN, FG_ALERT,
137 "Ack! unknown material name = %s in fgAptGenerat()\n",
141 ave_cart = geod_to_cart( average );
142 printf(" tile center = %.2f %.2f %.2f\n",
143 t->center.x, t->center.y, t->center.z);
144 printf(" airport center = %.2f %.2f %.2f\n",
145 average.x, average.y, average.z);
146 printf(" airport center = %.2f %.2f %.2f\n",
147 ave_cart.x, ave_cart.y, ave_cart.z);
148 fragment.center.x = ave_cart.x;
149 fragment.center.y = ave_cart.y;
150 fragment.center.z = ave_cart.z;
152 normal[0] = ave_cart.x;
153 normal[1] = ave_cart.y;
154 normal[2] = ave_cart.z;
155 MAT3_NORMALIZE_VEC(normal, temp);
157 display_list = xglGenLists(1);
158 xglNewList(display_list, GL_COMPILE);
159 xglBegin(GL_TRIANGLE_FAN);
162 cart_trans.x = ave_cart.x - t->center.x;
163 cart_trans.y = ave_cart.y - t->center.y;
164 cart_trans.z = ave_cart.z - t->center.z;
165 t->nodes[t->ncount][0] = cart_trans.x;
166 t->nodes[t->ncount][1] = cart_trans.y;
167 t->nodes[t->ncount][2] = cart_trans.z;
170 tex = calc_tex_coords( average );
171 xglTexCoord2f(tex.x, tex.y);
172 xglNormal3dv(normal);
173 xglVertex3d(cart_trans.x, cart_trans.y, cart_trans.z);
175 // first point (center of fan)
176 iterator current = perimeter.begin();
177 cart = geod_to_cart( *current );
178 cart_trans.x = cart.x - t->center.x;
179 cart_trans.y = cart.y - t->center.y;
180 cart_trans.z = cart.z - t->center.z;
181 center_num = t->ncount;
182 t->nodes[t->ncount][0] = cart_trans.x;
183 t->nodes[t->ncount][1] = cart_trans.y;
184 t->nodes[t->ncount][2] = cart_trans.z;
187 tex = calc_tex_coords( *current );
188 dist = calc_dist(ave_cart, cart);
189 if ( dist > max_dist ) {
192 xglTexCoord2f(tex.x, tex.y);
193 xglVertex3d(cart_trans.x, cart_trans.y, cart_trans.z);
195 const_iterator last = perimeter.end();
196 for ( ; current != last; ++current ) {
197 cart = geod_to_cart( *current );
198 cart_trans.x = cart.x - t->center.x;
199 cart_trans.y = cart.y - t->center.y;
200 cart_trans.z = cart.z - t->center.z;
201 t->nodes[t->ncount][0] = cart_trans.x;
202 t->nodes[t->ncount][1] = cart_trans.y;
203 t->nodes[t->ncount][2] = cart_trans.z;
205 fragment.add_face(center_num, t->ncount - 2, t->ncount - 1);
207 tex = calc_tex_coords( *current );
208 dist = calc_dist(ave_cart, cart);
209 if ( dist > max_dist ) {
212 xglTexCoord2f(tex.x, tex.y);
213 xglVertex3d(cart_trans.x, cart_trans.y, cart_trans.z);
216 // last point (first point in perimeter list)
217 current = perimeter.begin();
218 cart = geod_to_cart( *current );
219 cart_trans.x = cart.x - t->center.x;
220 cart_trans.y = cart.y - t->center.y;
221 cart_trans.z = cart.z - t->center.z;
222 fragment.add_face(center_num, t->ncount - 1, center_num + 1);
224 tex = calc_tex_coords( *current );
225 xglTexCoord2f(tex.x, tex.y);
226 xglVertex3d(cart_trans.x, cart_trans.y, cart_trans.z);
231 fragment.bounding_radius = max_dist;
232 fragment.display_list = display_list;
234 t->fragment_list.push_back(fragment);
238 // Load a .apt file and register the GL fragments with the
239 // corresponding tile
241 fgAptGenerate(const string& path, fgTILE *tile)
244 string apt_id, apt_name;
247 // face list (this indexes into the master tile vertex list)
249 fgPoint3d p, average;
252 // gpc_vertex p_2d, list_2d[MAX_PERIMETER];
253 // gpc_vertex_list perimeter_2d;
255 fg_gzifstream in( path );
257 // exit immediately assuming an airport file for this tile
264 // read in each line of the file
268 in.stream() >> token;
270 if ( token == "a" ) {
271 // airport info record (start of airport)
273 if ( apt_id != "" ) {
274 // we have just finished reading and airport record.
276 gen_base(average, perimeter, tile);
279 cout << "Reading airport record\n";
280 in.stream() >> apt_id;
282 average.lon = average.lat = average.radius = 0.0;
283 perimeter.erase( perimeter.begin(), perimeter.end() );
284 // skip to end of line.
285 while ( in.get(c) && c != '\n' ) {
288 cout << "\tID = " + apt_id + " Name = " + apt_name + "\n";
289 } else if ( token == "p" ) {
290 // airport area bounding polygon coordinate. These
291 // specify a convex hull that should already have been cut
292 // out of the base terrain. The points are given in
293 // counter clockwise order and are specified in lon/lat
295 in.stream() >> p.lon >> p.lat >> p.radius;
296 average.lon += p.lon;
297 average.lat += p.lat;
298 average.radius += p.radius;
299 perimeter.push_back(p);
300 } else if ( token == "r" ) {
303 while ( in.get(c) && c != '\n' );
306 // airports.insert(a);
310 if ( apt_id != "" ) {
311 // we have just finished reading and airport record.
313 size = perimeter.size();
314 average.lon /= (double)size;
315 average.lat /= (double)size;
316 average.radius /= (double)size;
318 gen_base(average, perimeter, tile);
326 // Revision 1.1 1998/09/14 02:14:01 curt
327 // Initial revision of genapt.[ch]xx for generating airport scenery.