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

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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
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38
AssemTris/assemtris.c
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@ -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) */
void read_nodes(FILE *fp) {
/* given a file pointer, read all the gdn (geodetic nodes from it.)
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];
while ( fgets(line, 250, fp) != NULL ) {
if ( strncmp(line, "gdn ", 4) == 0 ) {
sscanf(line, "gdn %lf %lf %lf\n", &nodes[nodecount][0],
&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,
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;
ne = my_open(basename, basepath, ".ne");
read_nodes(ne);
read_nodes(ne, 0.1, 0.1);
fclose(ne);
nw = my_open(basename, basepath, ".nw");
read_nodes(nw);
read_nodes(nw, -0.1, 0.1);
fclose(nw);
se = my_open(basename, basepath, ".se");
read_nodes(se);
read_nodes(se, 0.1, -0.1);
fclose(se);
sw = my_open(basename, basepath, ".sw");
read_nodes(sw);
read_nodes(sw, -0.1, -0.1);
fclose(sw);
north = my_open(basename, basepath, ".north");
read_nodes(north);
read_nodes(north, 0.0, 0.1);
fclose(north);
south = my_open(basename, basepath, ".south");
read_nodes(south);
read_nodes(south, 0.0, -0.1);
fclose(south);
east = my_open(basename, basepath, ".east");
read_nodes(east);
read_nodes(east, 0.1, 0.0);
fclose(east);
west = my_open(basename, basepath, ".west");
read_nodes(west);
read_nodes(west, -0.1, 0.0);
fclose(west);
body = my_open(basename, basepath, ".body");
read_nodes(body);
read_nodes(body, 0.0, 0.0);
fclose(body);
}
@ -454,9 +462,13 @@ int main(int argc, char **argv) {
/* $Log$
/* Revision 1.7 1998/04/14 02:26:00 curt
/* Code reorganizations. Added a Lib/ directory for more general libraries.
/* Revision 1.8 1998/06/01 17:58:19 curt
/* 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
* Adopted Gnu automake/autoconf system.
*