255 lines
6.3 KiB
C++
255 lines
6.3 KiB
C++
// shape.cxx -- shape/gpc utils
|
|
//
|
|
// Written by Curtis Olson, started February 1999.
|
|
//
|
|
// Copyright (C) 1999 Curtis L. Olson - curt@flightgear.org
|
|
//
|
|
// 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 <Include/compiler.h>
|
|
|
|
#include STL_STRING
|
|
|
|
#include <Bucket/newbucket.hxx>
|
|
#include <Debug/logstream.hxx>
|
|
|
|
#include <Polygon/index.hxx>
|
|
#include <Polygon/names.hxx>
|
|
#include "shape.hxx"
|
|
|
|
|
|
#define FG_MAX_VERTICES 100000
|
|
static gpc_vertex_list v_list;
|
|
|
|
|
|
class point2d {
|
|
public:
|
|
double x, y;
|
|
};
|
|
|
|
|
|
static void clip_and_write_poly( string root, long int p_index, AreaType area,
|
|
FGBucket b, gpc_polygon *shape ) {
|
|
point2d c, min, max;
|
|
c.x = b.get_center_lon();
|
|
c.y = b.get_center_lat();
|
|
double span = bucket_span(c.y);
|
|
gpc_polygon base, result;
|
|
char tile_name[256], poly_index[256];
|
|
|
|
// calculate bucket dimensions
|
|
if ( (c.y >= -89.0) && (c.y < 89.0) ) {
|
|
min.x = c.x - span / 2.0;
|
|
max.x = c.x + span / 2.0;
|
|
min.y = c.y - FG_HALF_BUCKET_SPAN;
|
|
max.y = c.y + FG_HALF_BUCKET_SPAN;
|
|
} else if ( c.y < -89.0) {
|
|
min.x = -90.0;
|
|
max.x = -89.0;
|
|
min.y = -180.0;
|
|
max.y = 180.0;
|
|
} else if ( c.y >= 89.0) {
|
|
min.x = 89.0;
|
|
max.x = 90.0;
|
|
min.y = -180.0;
|
|
max.y = 180.0;
|
|
} else {
|
|
FG_LOG ( FG_GENERAL, FG_ALERT,
|
|
"Out of range latitude in clip_and_write_poly() = " << c.y );
|
|
}
|
|
|
|
FG_LOG( FG_GENERAL, FG_INFO, " (" << min.x << "," << min.y << ") ("
|
|
<< max.x << "," << max.y << ")" );
|
|
|
|
// set up clipping tile
|
|
v_list.vertex[0].x = min.x;
|
|
v_list.vertex[0].y = min.y;
|
|
|
|
v_list.vertex[1].x = max.x;
|
|
v_list.vertex[1].y = min.y;
|
|
|
|
v_list.vertex[2].x = max.x;
|
|
v_list.vertex[2].y = max.y;
|
|
|
|
v_list.vertex[3].x = min.x;
|
|
v_list.vertex[3].y = max.y;
|
|
|
|
v_list.num_vertices = 4;
|
|
|
|
base.num_contours = 0;
|
|
base.contour = NULL;
|
|
gpc_add_contour( &base, &v_list );
|
|
|
|
// FG_LOG( FG_GENERAL, FG_DEBUG, "base = 4 vertices" );
|
|
|
|
/*
|
|
FILE *bfp= fopen("base", "w");
|
|
gpc_write_polygon(bfp, &base);
|
|
fclose(bfp);
|
|
*/
|
|
|
|
gpc_polygon_clip(GPC_INT, &base, shape, &result);
|
|
|
|
if ( result.num_contours > 0 ) {
|
|
long int t_index = b.gen_index();
|
|
string path = root + "/Scenery/" + b.gen_base_path();
|
|
string command = "mkdir -p " + path;
|
|
system( command.c_str() );
|
|
|
|
sprintf( tile_name, "%ld", t_index );
|
|
string polyfile = path + "/" + tile_name;
|
|
|
|
sprintf( poly_index, "%ld", p_index );
|
|
polyfile += ".";
|
|
polyfile += poly_index;
|
|
|
|
string poly_type = get_area_name( area );
|
|
if ( poly_type == "Unknown" ) {
|
|
cout << "unknown area type in clip_and_write_poly()!" << endl;
|
|
exit(-1);
|
|
}
|
|
|
|
FILE *rfp= fopen( polyfile.c_str(), "w" );
|
|
fprintf( rfp, "%s\n", poly_type.c_str() );
|
|
gpc_write_polygon( rfp, &result );
|
|
fclose( rfp );
|
|
}
|
|
|
|
gpc_free_polygon(&base);
|
|
gpc_free_polygon(&result);
|
|
}
|
|
|
|
|
|
// Initialize structure we use to create polygons for the gpc library
|
|
bool shape_utils_init() {
|
|
v_list.num_vertices = 0;
|
|
v_list.vertex = new gpc_vertex[FG_MAX_VERTICES];;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// initialize a gpc_polygon
|
|
void init_shape(gpc_polygon *shape) {
|
|
shape->num_contours = 0;
|
|
shape->contour = NULL;
|
|
}
|
|
|
|
|
|
// make a gpc_polygon
|
|
void add_to_shape(int count, double *coords, gpc_polygon *shape) {
|
|
|
|
for ( int i = 0; i < count; i++ ) {
|
|
v_list.vertex[i].x = coords[i*2+0];
|
|
v_list.vertex[i].y = coords[i*2+1];
|
|
}
|
|
|
|
v_list.num_vertices = count;
|
|
gpc_add_contour( shape, &v_list );
|
|
}
|
|
|
|
|
|
// process shape (write polygon to all intersecting tiles)
|
|
void process_shape(string path, AreaType area, gpc_polygon *gpc_shape) {
|
|
point2d min, max;
|
|
long int index;
|
|
int i, j;
|
|
|
|
min.x = min.y = 200.0;
|
|
max.x = max.y = -200.0;
|
|
|
|
// find min/max of polygon
|
|
for ( i = 0; i < gpc_shape->num_contours; i++ ) {
|
|
for ( j = 0; j < gpc_shape->contour[i].num_vertices; j++ ) {
|
|
double x = gpc_shape->contour[i].vertex[j].x;
|
|
double y = gpc_shape->contour[i].vertex[j].y;
|
|
|
|
if ( x < min.x ) { min.x = x; }
|
|
if ( y < min.y ) { min.y = y; }
|
|
if ( x > max.x ) { max.x = x; }
|
|
if ( y > max.y ) { max.y = y; }
|
|
}
|
|
}
|
|
|
|
/*
|
|
FILE *sfp= fopen("shape", "w");
|
|
gpc_write_polygon(sfp, gpc_shape);
|
|
fclose(sfp);
|
|
exit(-1);
|
|
*/
|
|
|
|
// get next polygon index
|
|
index = poly_index_next();
|
|
|
|
FG_LOG( FG_GENERAL, FG_INFO, " min = " << min.x << "," << min.y
|
|
<< " max = " << max.x << "," << max.y );
|
|
|
|
// find buckets for min, and max points of convex hull.
|
|
// note to self: self, you should think about checking for
|
|
// polygons that span the date line
|
|
FGBucket b_min(min.x, min.y);
|
|
FGBucket b_max(max.x, max.y);
|
|
FG_LOG( FG_GENERAL, FG_INFO, " Bucket min = " << b_min );
|
|
FG_LOG( FG_GENERAL, FG_INFO, " Bucket max = " << b_max );
|
|
|
|
if ( b_min == b_max ) {
|
|
clip_and_write_poly( path, index, area, b_min, gpc_shape );
|
|
} else {
|
|
FGBucket b_cur;
|
|
int dx, dy, i, j;
|
|
|
|
fgBucketDiff(b_min, b_max, &dx, &dy);
|
|
FG_LOG( FG_GENERAL, FG_INFO,
|
|
" polygon spans tile boundaries" );
|
|
FG_LOG( FG_GENERAL, FG_INFO, " dx = " << dx
|
|
<< " dy = " << dy );
|
|
|
|
if ( (dx > 100) || (dy > 100) ) {
|
|
FG_LOG( FG_GENERAL, FG_ALERT,
|
|
"somethings really wrong!!!!" );
|
|
exit(-1);
|
|
}
|
|
|
|
for ( j = 0; j <= dy; j++ ) {
|
|
for ( i = 0; i <= dx; i++ ) {
|
|
b_cur = fgBucketOffset(min.x, min.y, i, j);
|
|
clip_and_write_poly( path, index, area, b_cur, gpc_shape );
|
|
}
|
|
}
|
|
// string answer; cin >> answer;
|
|
}
|
|
}
|
|
|
|
|
|
// free a gpc_polygon
|
|
void free_shape(gpc_polygon *shape) {
|
|
gpc_free_polygon(shape);
|
|
}
|
|
|
|
|
|
// $Log$
|
|
// Revision 1.3 1999/03/19 00:27:41 curt
|
|
// Use long int for index instead of just int.
|
|
//
|
|
// Revision 1.2 1999/02/25 21:31:08 curt
|
|
// First working version???
|
|
//
|
|
// Revision 1.1 1999/02/23 01:29:06 curt
|
|
// Additional progress.
|
|
//
|