fly/flightgear
1
0
Fork 0
Code Activity

Added a slight border overlap to try to minimize pixel wide gaps between

Browse source 
tiles due to round off error.  This is not a perfect solution, but helps.
This commit is contained in:
curt 1998-06-01 17:58:19 +00:00
parent 17dbfaeee0
commit 96de3b06e8
1 changed files with 25 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
AssemTris/assemtris.c
View file

@ -309,14 +309,22 @@ FILE *my_open(char *basename, char *basepath, char *ext) {
} }
/* given a file pointer, read all the gdn (geodetic nodes from it) */ /* given a file pointer, read all the gdn (geodetic nodes from it.)
void read_nodes(FILE *fp) { The specified offset values (in arcsec) are used to overlap the
edges of the tile slightly to cover gaps induced by floating point
precision problems. 1 arcsec == about 100 feet so 0.01 arcsec ==
about 1 foot */
void read_nodes(FILE *fp, double offset_lon, double offset_lat) {
char line[256]; char line[256];
while ( fgets(line, 250, fp) != NULL ) { while ( fgets(line, 250, fp) != NULL ) {
if ( strncmp(line, "gdn ", 4) == 0 ) { if ( strncmp(line, "gdn ", 4) == 0 ) {
sscanf(line, "gdn %lf %lf %lf\n", &nodes[nodecount][0], sscanf(line, "gdn %lf %lf %lf\n", &nodes[nodecount][0],
&nodes[nodecount][1], &nodes[nodecount][2]); &nodes[nodecount][1], &nodes[nodecount][2]);
nodes[nodecount][0] += offset_lon;
nodes[nodecount][1] += offset_lat;
/* /*
printf("read_nodes(%d) %.2f %.2f %.2f %s", nodecount, printf("read_nodes(%d) %.2f %.2f %.2f %s", nodecount,
nodes[nodecount][0], nodes[nodecount][1], nodes[nodecount][0], nodes[nodecount][1],
@ -334,39 +342,39 @@ void build_node_list(char *basename, char *basepath) {
FILE *ne, *nw, *se, *sw, *north, *south, *east, *west, *body; FILE *ne, *nw, *se, *sw, *north, *south, *east, *west, *body;
ne = my_open(basename, basepath, ".ne"); ne = my_open(basename, basepath, ".ne");
read_nodes(ne); read_nodes(ne, 0.1, 0.1);
fclose(ne); fclose(ne);
nw = my_open(basename, basepath, ".nw"); nw = my_open(basename, basepath, ".nw");
read_nodes(nw); read_nodes(nw, -0.1, 0.1);
fclose(nw); fclose(nw);
se = my_open(basename, basepath, ".se"); se = my_open(basename, basepath, ".se");
read_nodes(se); read_nodes(se, 0.1, -0.1);
fclose(se); fclose(se);
sw = my_open(basename, basepath, ".sw"); sw = my_open(basename, basepath, ".sw");
read_nodes(sw); read_nodes(sw, -0.1, -0.1);
fclose(sw); fclose(sw);
north = my_open(basename, basepath, ".north"); north = my_open(basename, basepath, ".north");
read_nodes(north); read_nodes(north, 0.0, 0.1);
fclose(north); fclose(north);
south = my_open(basename, basepath, ".south"); south = my_open(basename, basepath, ".south");
read_nodes(south); read_nodes(south, 0.0, -0.1);
fclose(south); fclose(south);
east = my_open(basename, basepath, ".east"); east = my_open(basename, basepath, ".east");
read_nodes(east); read_nodes(east, 0.1, 0.0);
fclose(east); fclose(east);
west = my_open(basename, basepath, ".west"); west = my_open(basename, basepath, ".west");
read_nodes(west); read_nodes(west, -0.1, 0.0);
fclose(west); fclose(west);
body = my_open(basename, basepath, ".body"); body = my_open(basename, basepath, ".body");
read_nodes(body); read_nodes(body, 0.0, 0.0);
fclose(body); fclose(body);
} }
@ -454,9 +462,13 @@ int main(int argc, char **argv) {
/* $Log$ /* $Log$
/* Revision 1.7 1998/04/14 02:26:00 curt /* Revision 1.8 1998/06/01 17:58:19 curt
/* Code reorganizations. Added a Lib/ directory for more general libraries. /* Added a slight border overlap to try to minimize pixel wide gaps between
/* tiles due to round off error. This is not a perfect solution, but helps.
/* /*
* Revision 1.7 1998/04/14 02:26:00 curt
* Code reorganizations. Added a Lib/ directory for more general libraries.
*
* Revision 1.6 1998/04/08 22:54:58 curt * Revision 1.6 1998/04/08 22:54:58 curt
* Adopted Gnu automake/autoconf system. * Adopted Gnu automake/autoconf system.
* *