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)
36 int load_dem(const string& work_base, FGBucket& b, FGArray& array) {
38 string base = b.gen_base_path();
39 long int b_index = b.gen_index();
40 sprintf(tile_name, "%ld", b_index);
42 string dem_path = work_base + ".dem" + "/Scenery/" + base
43 + "/" + tile_name + ".dem";
44 cout << "dem_path = " << dem_path << endl;
46 if ( ! array.open(dem_path) ) {
56 // do actual scan of directory and loading of files
57 int actual_load_polys( const string& dir, FGBucket& b, FGClipper& clipper ) {
60 string base = b.gen_base_path();
61 long int b_index = b.gen_index();
62 sprintf(tile_char, "%ld", b_index);
63 string tile_str = tile_char;
69 if ( (d = opendir( dir.c_str() )) == NULL ) {
70 cout << "cannot open directory " << dir << "\n";
74 // load all matching polygon files
75 string file, f_index, full_path;
77 while ( (de = readdir(d)) != NULL ) {
80 f_index = file.substr(0, pos);
82 if ( tile_str == f_index ) {
83 ext = file.substr(pos + 1);
84 cout << file << " " << f_index << " '" << ext << "'" << endl;
85 full_path = dir + "/" + file;
86 if ( (ext == "dem") || (ext == "dem.gz") ) {
89 cout << "ext = '" << ext << "'" << endl;
90 clipper.load_polys( full_path );
100 // load all 2d polygons matching the specified base path and clip
101 // against each other to resolve any overlaps
102 int load_polys( const string& work_base, FGBucket& b, FGClipper& clipper) {
103 string base = b.gen_base_path();
106 // initialize clipper
110 string poly_path = work_base + ".apt" + "/Scenery/" + base;
111 cout << "poly_path = " << poly_path << endl;
112 result = actual_load_polys( poly_path, b, clipper );
113 cout << " loaded " << result << " polys" << endl;
116 poly_path = work_base + ".hydro" + "/Scenery/" + base;
117 cout << "poly_path = " << poly_path << endl;
118 result = actual_load_polys( poly_path, b, clipper );
119 cout << " loaded " << result << " polys" << endl;
122 min.x = b.get_center_lon() - 0.5 * b.get_width();
123 min.y = b.get_center_lat() - 0.5 * b.get_height();
124 max.x = b.get_center_lon() + 0.5 * b.get_width();
125 max.y = b.get_center_lat() + 0.5 * b.get_height();
128 cout << "clipping polygons" << endl;
129 clipper.clip_all(min, max);
135 // triangulate the data for each polygon
136 void triangulate( const FGArray& array, const FGClipper& clipper,
138 // first we need to consolidate the points of all the polygons
139 // into a more "Triangle" friendly format
140 FGgpcPolyList gpc_polys;
142 gpc_polys = clipper.get_polys_clipped();
144 t.build( gpc_polys );
148 main(int argc, char **argv) {
152 cout << "Usage: " << argv[0] << " work_base" << endl;
156 string work_base = argv[1];
158 lon = -146.248360; lat = 61.133950; // PAVD (Valdez, AK)
159 // lon = -110.664244; lat = 33.352890; // P13
160 FGBucket b( lon, lat );
162 // load and fit grid of elevation data
164 load_dem( work_base, b, array );
166 // load and clip 2d polygon data
168 load_polys( work_base, b, clipper );
170 // triangulate the data for each polygon
172 triangulate( array, clipper, t );
177 // Revision 1.2 1999/03/17 23:49:52 curt
178 // Started work on Triangulate/ section.
180 // Revision 1.1 1999/03/14 00:03:24 curt