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flightgear/Airports/genapt.cxx
curt 7efee52485 Point3D tweaks.
1998-10-18 01:17:16 +00:00

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8.3 KiB
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//
// getapt.cxx -- generate airport scenery from the given definition file
//
// Written by Curtis Olson, started September 1998.
//
// Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$
// (Log is kept at end of this file)
#include <string> // Standard C++ string library
#include <vector>
#include "Include/fg_stl_config.h"
#ifdef NEEDNAMESPACESTD
using namespace std;
#endif
#include <Debug/fg_debug.h>
// #include <Include/fg_types.h>
#include <Math/fg_geodesy.hxx>
#include <Math/mat3.h>
#include <Math/point3d.hxx>
#include <Math/polar3d.hxx>
#include <Misc/fgstream.hxx>
#include <Objects/material.hxx>
// #include <gpc/gpc.h>
#include "genapt.hxx"
typedef vector < Point3D > container;
typedef container::iterator iterator;
typedef container::const_iterator const_iterator;
/*
// Calculate distance between to Point3D's
static double calc_dist(const Point3D& p1, const Point3D& p2) {
double x, y, z;
x = p1.x() - p2.x();
y = p1.y() - p2.y();
z = p1.z() - p2.z();
return sqrt(x*x + y*y + z*z);
}
*/
#define FG_APT_BASE_TEX_CONSTANT 2000.0
// Calculate texture coordinates for a given point.
static Point3D calc_tex_coords(double *node, const Point3D& ref) {
Point3D cp;
Point3D pp;
cp = Point3D( node[0] + ref.x(), node[1] + ref.y(), node[2] + ref.z() );
pp = fgCartToPolar3d(cp);
pp.setx( fmod(FG_APT_BASE_TEX_CONSTANT * pp.x(), 10.0) );
pp.sety( fmod(FG_APT_BASE_TEX_CONSTANT * pp.y(), 10.0) );
if ( pp.x() < 0.0 ) {
pp.setx( pp.x() + 10.0 );
}
if ( pp.y() < 0.0 ) {
pp.sety( pp.y() + 10.0 );
}
return(pp);
}
// generate the actual base area for the airport
static void
gen_base( const Point3D& average, const container& perimeter, fgTILE *t)
{
GLint display_list;
Point3D cart, cart_trans, tex;
MAT3vec normal;
double dist, max_dist, temp;
int center_num, i;
fgFRAGMENT fragment;
max_dist = 0.0;
cout << "generating airport base for size = " << perimeter.size() << "\n";
fragment.init();
fragment.tile_ptr = t;
// find airport base material in the properties list
if ( ! material_mgr.find( APT_BASE_MATERIAL, fragment.material_ptr )) {
fgPrintf( FG_TERRAIN, FG_ALERT,
"Ack! unknown material name = %s in fgAptGenerat()\n",
APT_BASE_MATERIAL );
}
printf(" tile center = %.2f %.2f %.2f\n",
t->center.x(), t->center.y(), t->center.z() );
printf(" airport center = %.2f %.2f %.2f\n",
average.x(), average.y(), average.z());
fragment.center = average;
normal[0] = average.x();
normal[1] = average.y();
normal[2] = average.z();
MAT3_NORMALIZE_VEC(normal, temp);
display_list = xglGenLists(1);
xglNewList(display_list, GL_COMPILE);
xglBegin(GL_TRIANGLE_FAN);
// first point center of fan
cart_trans = average - t->center;
t->nodes[t->ncount][0] = cart_trans.x();
t->nodes[t->ncount][1] = cart_trans.y();
t->nodes[t->ncount][2] = cart_trans.z();
center_num = t->ncount;
t->ncount++;
tex = calc_tex_coords( t->nodes[t->ncount-1], t->center );
xglTexCoord2f(tex.x(), tex.y());
xglNormal3dv(normal);
xglVertex3dv(t->nodes[t->ncount-1]);
// first point on perimeter
const_iterator current = perimeter.begin();
cart = fgGeodToCart( *current );
cart_trans = cart - t->center;
t->nodes[t->ncount][0] = cart_trans.x();
t->nodes[t->ncount][1] = cart_trans.y();
t->nodes[t->ncount][2] = cart_trans.z();
t->ncount++;
i = 1;
tex = calc_tex_coords( t->nodes[i], t->center );
dist = distance3D(average, cart);
if ( dist > max_dist ) {
max_dist = dist;
}
xglTexCoord2f(tex.x(), tex.y());
xglVertex3dv(t->nodes[i]);
++current;
++i;
const_iterator last = perimeter.end();
for ( ; current != last; ++current ) {
cart = fgGeodToCart( *current );
cart_trans = cart - t->center;
t->nodes[t->ncount][0] = cart_trans.x();
t->nodes[t->ncount][1] = cart_trans.y();
t->nodes[t->ncount][2] = cart_trans.z();
t->ncount++;
fragment.add_face(center_num, i - 1, i);
tex = calc_tex_coords( t->nodes[i], t->center );
dist = distance3D(average, cart);
if ( dist > max_dist ) {
max_dist = dist;
}
xglTexCoord2f(tex.x(), tex.y());
xglVertex3dv(t->nodes[i]);
i++;
}
// last point (first point in perimeter list)
current = perimeter.begin();
cart = fgGeodToCart( *current );
cart_trans = cart - t->center;
fragment.add_face(center_num, i - 1, 1);
tex = calc_tex_coords( t->nodes[1], t->center );
xglTexCoord2f(tex.x(), tex.y());
xglVertex3dv(t->nodes[1]);
xglEnd();
xglEndList();
fragment.bounding_radius = max_dist;
fragment.display_list = display_list;
t->fragment_list.push_back(fragment);
}
// Load a .apt file and register the GL fragments with the
// corresponding tile
int
fgAptGenerate(const string& path, fgTILE *tile)
{
string token;
string apt_id, apt_name;
char c;
int i = 1;
// face list (this indexes into the master tile vertex list)
container perimeter;
Point3D p, average;
double avex = 0.0, avey = 0.0, avez = 0.0;
int size;
// gpc_vertex p_2d, list_2d[MAX_PERIMETER];
// gpc_vertex_list perimeter_2d;
fg_gzifstream in( path );
if ( !in ) {
// exit immediately assuming an airport file for this tile
// doesn't exist.
return 0;
}
apt_id = "";
// read in each line of the file
in.eat_comments();
while ( ! in.eof() )
{
in.stream() >> token;
if ( token == "a" ) {
// airport info record (start of airport)
if ( apt_id != "" ) {
// we have just finished reading and airport record.
// process the info
gen_base(average, perimeter, tile);
}
cout << "Reading airport record\n";
in.stream() >> apt_id;
apt_name = "";
i = 1;
avex = avey = avez = 0.0;
perimeter.erase( perimeter.begin(), perimeter.end() );
// skip to end of line.
while ( in.get(c) && c != '\n' ) {
apt_name += c;
}
cout << "\tID = " + apt_id + " Name = " + apt_name + "\n";
} else if ( token == "p" ) {
// airport area bounding polygon coordinate. These
// specify a convex hull that should already have been cut
// out of the base terrain. The points are given in
// counter clockwise order and are specified in lon/lat
// degrees.
in.stream() >> p;
avex += tile->nodes[i][0];
avey += tile->nodes[i][1];
avez += tile->nodes[i][2];
perimeter.push_back(p);
++i;
} else if ( token == "r" ) {
// runway record
// skip for now
while ( in.get(c) && c != '\n' );
}
// airports.insert(a);
in.eat_comments();
}
if ( apt_id != "" ) {
// we have just finished reading and airport record.
// process the info
size = perimeter.size();
average = Point3D( avex / (double)size + tile->center.x(),
avey / (double)size + tile->center.y(),
avez / (double)size + tile->center.z() );
gen_base(average, perimeter, tile);
}
return 1;
}
// $Log$
// Revision 1.6 1998/10/18 01:17:16 curt
// Point3D tweaks.
//
// Revision 1.5 1998/10/16 23:27:14 curt
// C++-ifying.
//
// Revision 1.4 1998/10/16 00:51:46 curt
// Converted to Point3D class.
//
// Revision 1.3 1998/09/21 20:55:00 curt
// Used the cartesian form of the airport area coordinates to determine the
// center.
//
// Revision 1.2 1998/09/14 12:44:30 curt
// Don't recalculate perimeter points since it is not likely that they will match
// exactly with the previously calculated points, which will leave an ugly gap
// around the airport area.
//
// Revision 1.1 1998/09/14 02:14:01 curt
// Initial revision of genapt.[ch]xx for generating airport scenery.
//
//
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