1 // main.cxx -- top level construction routines
3 // Written by Curtis Olson, started March 1999.
5 // Copyright (C) 1999 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 // (Log is kept at end of this file)
25 #include <sys/types.h> // for directory reading
26 #include <dirent.h> // for directory reading
28 #include <Bucket/newbucket.hxx>
30 #include <Array/array.hxx>
31 #include <Clipper/clipper.hxx>
32 #include <Triangulate/triangle.hxx>
35 // load regular grid of elevation data (dem based), return list of
37 int load_dem(const string& work_base, FGBucket& b, FGArray& array) {
40 string base = b.gen_base_path();
41 long int b_index = b.gen_index();
42 sprintf(tile_name, "%ld", b_index);
44 string dem_path = work_base + ".dem" + "/Scenery/" + base
45 + "/" + tile_name + ".dem";
46 cout << "dem_path = " << dem_path << endl;
48 if ( ! array.open(dem_path) ) {
49 cout << "ERROR: cannot open " << dem_path << endl;
60 // do actual scan of directory and loading of files
61 int actual_load_polys( const string& dir, FGBucket& b, FGClipper& clipper ) {
64 string base = b.gen_base_path();
65 long int b_index = b.gen_index();
66 sprintf(tile_char, "%ld", b_index);
67 string tile_str = tile_char;
73 if ( (d = opendir( dir.c_str() )) == NULL ) {
74 cout << "cannot open directory " << dir << "\n";
78 // load all matching polygon files
79 string file, f_index, full_path;
81 while ( (de = readdir(d)) != NULL ) {
84 f_index = file.substr(0, pos);
86 if ( tile_str == f_index ) {
87 ext = file.substr(pos + 1);
88 cout << file << " " << f_index << " '" << ext << "'" << endl;
89 full_path = dir + "/" + file;
90 if ( (ext == "dem") || (ext == "dem.gz") ) {
93 cout << "ext = '" << ext << "'" << endl;
94 clipper.load_polys( full_path );
104 // load all 2d polygons matching the specified base path and clip
105 // against each other to resolve any overlaps
106 int load_polys( const string& work_base, FGBucket& b, FGClipper& clipper) {
107 string base = b.gen_base_path();
110 // initialize clipper
114 string poly_path = work_base + ".apt" + "/Scenery/" + base;
115 cout << "poly_path = " << poly_path << endl;
116 result = actual_load_polys( poly_path, b, clipper );
117 cout << " loaded " << result << " polys" << endl;
120 poly_path = work_base + ".hydro" + "/Scenery/" + base;
121 cout << "poly_path = " << poly_path << endl;
122 result = actual_load_polys( poly_path, b, clipper );
123 cout << " loaded " << result << " polys" << endl;
126 min.x = b.get_center_lon() - 0.5 * b.get_width();
127 min.y = b.get_center_lat() - 0.5 * b.get_height();
128 max.x = b.get_center_lon() + 0.5 * b.get_width();
129 max.y = b.get_center_lat() + 0.5 * b.get_height();
132 cout << "clipping polygons" << endl;
133 clipper.clip_all(min, max);
139 // triangulate the data for each polygon
140 void do_triangulate( const FGArray& array, const FGClipper& clipper,
142 // first we need to consolidate the points of the DEM fit list and
143 // all the polygons into a more "Triangle" friendly format
145 fitnode_list fit_list = array.get_fit_node_list();
146 FGgpcPolyList gpc_polys = clipper.get_polys_clipped();
148 cout << "ready to build node list and polygons" << endl;
149 t.build( fit_list, gpc_polys );
150 cout << "done building node list and polygons" << endl;
152 cout << "ready to do triangulation" << endl;
154 cout << "finished triangulation" << endl;
158 main(int argc, char **argv) {
159 fitnode_list fit_list;
163 cout << "Usage: " << argv[0] << " work_base" << endl;
167 string work_base = argv[1];
169 // lon = -146.248360; lat = 61.133950; // PAVD (Valdez, AK)
170 // lon = -110.664244; lat = 33.352890; // P13
171 // lon = -93.211389; lat = 45.145000; // KANE
172 lon = -92.486188; lat = 44.590190; // KRGK
173 // lon = -89.744682312011719; lat= 29.314495086669922;
175 FGBucket b( lon, lat );
177 // load and fit grid of elevation data
179 load_dem( work_base, b, array );
181 // load and clip 2d polygon data
183 load_polys( work_base, b, clipper );
185 // triangulate the data for each polygon
187 do_triangulate( array, clipper, t );
192 // Revision 1.5 1999/03/21 14:02:05 curt
193 // Added a mechanism to dump out the triangle structures for viewing.
194 // Fixed a couple bugs in first pass at triangulation.
195 // - needed to explicitely initialize the polygon accumulator in triangle.cxx
196 // before each polygon rather than depending on the default behavior.
197 // - Fixed a problem with region attribute propagation where I wasn't generating
198 // the hole points correctly.
200 // Revision 1.4 1999/03/20 20:32:54 curt
201 // First mostly successful tile triangulation works. There's plenty of tweaking
202 // to do, but we are marching in the right direction.
204 // Revision 1.3 1999/03/19 00:26:52 curt
207 // Revision 1.2 1999/03/17 23:49:52 curt
208 // Started work on Triangulate/ section.
210 // Revision 1.1 1999/03/14 00:03:24 curt