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Keep a file bounding box to know the area that needs to be tiled

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This commit is contained in:
Eric Fischer 2014-09-18 10:26:47 -07:00
parent 14e7b648ed
commit e8adeba40e
1 changed files with 15 additions and 0 deletions

15
geojson.c

@ -291,6 +291,8 @@ void read_json(FILE *f) {
FILE *indexfile = fopen("index.out", "wb");
long long fpos = 0;
unsigned file_bbox[] = { UINT_MAX, UINT_MAX, 0, 0 };
while (1) {
json_object *j = json_read(jp);
if (j == NULL) {
@ -387,6 +389,17 @@ void read_json(FILE *f) {
serialize_int(metafile, t, &fpos);
parse_geometry(t, coordinates, bbox, &fpos, metafile, VT_MOVETO);
serialize_int(metafile, VT_END, &fpos);
for (i = 0; i < 2; i++) {
if (bbox[i] < file_bbox[i]) {
file_bbox[i] = bbox[i];
}
}
for (i = 2; i < 4; i++) {
if (bbox[i] > file_bbox[i]) {
file_bbox[i] = bbox[i];
}
}
// printf("bbox %x %x %x %x\n", bbox[0], bbox[1], bbox[2], bbox[3]);
@ -402,6 +415,8 @@ next_feature:
/* XXX check for any non-features in the outer object */
}
printf("bbox: %x %x %x %x\n", file_bbox[0], file_bbox[1], file_bbox[2], file_bbox[3]);
json_end(jp);
fclose(metafile);
fclose(indexfile);