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Choose the center of the busiest tile for the map center

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This commit is contained in:
Eric Fischer 2014-09-24 12:14:35 -07:00
parent fbf60b6d80
commit ce3cdfc5e9
3 changed files with 22 additions and 7 deletions
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21
geojson.c
View File

@ -322,8 +322,9 @@ void range_search(struct index *ix, long long n, unsigned long long start, unsig
}
}
void check(struct index *ix, long long n, char *metabase, unsigned *file_bbox, struct pool *file_keys) {
void check(struct index *ix, long long n, char *metabase, unsigned *file_bbox, struct pool *file_keys, unsigned *midx, unsigned *midy) {
fprintf(stderr, "\n");
long long most = 0;
int z;
for (z = BASE_ZOOM; z >= 0; z--) {
@ -357,7 +358,13 @@ void check(struct index *ix, long long n, char *metabase, unsigned *file_bbox, s
printf("%d/%u/%u %x %x %lld to %lld\n", z, tx, ty, wx, wy, (long long)(i - ix), (long long)(j - ix));
write_tile(i, j, metabase, file_bbox, z, tx, ty, z == BASE_ZOOM ? 12 : 10, BASE_ZOOM, file_keys);
long long len = write_tile(i, j, metabase, file_bbox, z, tx, ty, z == BASE_ZOOM ? 12 : 10, BASE_ZOOM, file_keys);
if (z == BASE_ZOOM && len > most) {
*midx = tx;
*midy = ty;
most = len;
}
}
}
}
@ -390,6 +397,7 @@ void read_json(FILE *f, char *fname) {
unlink(indexname);
unsigned file_bbox[] = { UINT_MAX, UINT_MAX, 0, 0 };
unsigned midx = 0, midy = 0;
json_pull *jp = json_begin_file(f);
long long seq = 0;
@ -570,7 +578,7 @@ next_feature:
file_keys.tail = NULL;
qsort(index, indexst.st_size / sizeof(struct index), sizeof(struct index), indexcmp);
check(index, indexst.st_size / sizeof(struct index), meta, file_bbox, &file_keys);
check(index, indexst.st_size / sizeof(struct index), meta, file_bbox, &file_keys, &midx, &midy);
munmap(index, indexst.st_size);
munmap(meta, metast.st_size);
@ -594,12 +602,15 @@ next_feature:
double minlat = 0, minlon = 0, maxlat = 0, maxlon = 0, midlat = 0, midlon = 0;
tile2latlon(file_bbox[0], file_bbox[1], 32, &maxlat, &minlon);
tile2latlon(file_bbox[2], file_bbox[3], 32, &minlat, &maxlon);
tile2latlon(midx, midy, BASE_ZOOM, &maxlat, &minlon);
tile2latlon(midx + 1, midy + 1, BASE_ZOOM, &minlat, &maxlon);
midlat = (maxlat + minlat) / 2;
midlon = (maxlon + minlon) / 2;
tile2latlon(file_bbox[0], file_bbox[1], 32, &maxlat, &minlon);
tile2latlon(file_bbox[2], file_bbox[3], 32, &minlat, &maxlon);
fprintf(fp, "\"version\": 1,\n");
fprintf(fp, "\"minzoom\": %d,\n", 0);
fprintf(fp, "\"maxzoom\": %d,\n", BASE_ZOOM);

6
tile.cc
View File

@ -204,7 +204,7 @@ int remove_noop(struct draw *geom, int n) {
return out;
}
void write_tile(struct index *start, struct index *end, char *metabase, unsigned *file_bbox, int z, unsigned tx, unsigned ty, int detail, int basezoom, struct pool *file_keys) {
long long write_tile(struct index *start, struct index *end, char *metabase, unsigned *file_bbox, int z, unsigned tx, unsigned ty, int detail, int basezoom, struct pool *file_keys) {
GOOGLE_PROTOBUF_VERIFY_VERSION;
mapnik::vector::tile tile;
@ -235,6 +235,7 @@ void write_tile(struct index *start, struct index *end, char *metabase, unsigned
double interval = 1;
double seq = 0;
long long count = 0;
if (z < basezoom) {
interval = exp(log(2.5) * (basezoom - z));
@ -288,6 +289,7 @@ void write_tile(struct index *start, struct index *end, char *metabase, unsigned
}
draw(geom, len, feature);
count += len;
int m;
deserialize_int(&meta, &m);
@ -351,5 +353,7 @@ void write_tile(struct index *start, struct index *end, char *metabase, unsigned
FILE *f = fopen(path, "wb");
fwrite(compressed.data(), 1, compressed.size(), f);
fclose(f);
return count;
}

2
tile.h
View File

@ -49,4 +49,4 @@ struct index {
};
void write_tile(struct index *start, struct index *end, char *metabase, unsigned *file_bbox, int z, unsigned x, unsigned y, int detail, int basezoom, struct pool *file_keys);
long long write_tile(struct index *start, struct index *end, char *metabase, unsigned *file_bbox, int z, unsigned x, unsigned y, int detail, int basezoom, struct pool *file_keys);