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Add a flag to select the rate at which points are dropped at low zooms.

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This commit is contained in:
Eric Fischer 2014-10-07 13:54:13 -07:00
parent 8f71604fe6
commit adbd9f6edb
4 changed files with 19 additions and 13 deletions
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1
README.md
View File

@ -26,6 +26,7 @@ Options
* -D Detail at lower zoom levels (default 10, for tile resolution of 1024)
* -x Property (removes the named properties from all features)
* -f Force: Delete existing mbtiles file if it already exists.
* -r Rate at which dots are dropped at lower zoom levels (default 2.5)
Example
-------

21
geojson.c
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@ -233,7 +233,7 @@ struct pool_val *deserialize_string(char **f, struct pool *p, int type) {
return ret;
}
void check(struct index *ix, long long n, char *metabase, unsigned *file_bbox, struct pool *file_keys, unsigned *midx, unsigned *midy, char *layername, int maxzoom, int minzoom, sqlite3 *outdb) {
void check(struct index *ix, long long n, char *metabase, unsigned *file_bbox, struct pool *file_keys, unsigned *midx, unsigned *midy, char *layername, int maxzoom, int minzoom, sqlite3 *outdb, double droprate) {
fprintf(stderr, "\n");
long long most = 0;
@ -269,7 +269,7 @@ void check(struct index *ix, long long n, char *metabase, unsigned *file_bbox, s
fprintf(stderr, " %3.1f%% %d/%u/%u %x %x %lld to %lld \r", (((i - ix) + (j - ix)) / 2.0 / n + (maxzoom - z)) / (maxzoom - minzoom + 1) * 100, z, tx, ty, wx, wy, (long long)(i - ix), (long long)(j - ix));
long long len = write_tile(i, j, metabase, file_bbox, z, tx, ty, z == maxzoom ? full_detail : low_detail, maxzoom, file_keys, layername, outdb);
long long len = write_tile(i, j, metabase, file_bbox, z, tx, ty, z == maxzoom ? full_detail : low_detail, maxzoom, file_keys, layername, outdb, droprate);
if (z == maxzoom && len > most) {
*midx = tx;
@ -282,7 +282,7 @@ void check(struct index *ix, long long n, char *metabase, unsigned *file_bbox, s
fprintf(stderr, "\n");
}
void read_json(FILE *f, char *fname, char *layername, int maxzoom, int minzoom, sqlite3 *outdb, struct pool *exclude) {
void read_json(FILE *f, char *fname, char *layername, int maxzoom, int minzoom, sqlite3 *outdb, struct pool *exclude, double droprate) {
char metaname[] = "/tmp/meta.XXXXXXXX";
char indexname[] = "/tmp/index.XXXXXXXX";
@ -509,7 +509,7 @@ next_feature:
}
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, &midx, &midy, layername, maxzoom, minzoom, outdb);
check(index, indexst.st_size / sizeof(struct index), meta, file_bbox, &file_keys, &midx, &midy, layername, maxzoom, minzoom, outdb, droprate);
munmap(index, indexst.st_size);
munmap(meta, metast.st_size);
@ -545,11 +545,12 @@ int main(int argc, char **argv) {
int maxzoom = 14;
int minzoom = 0;
int force = 0;
double droprate = 2.5;
struct pool exclude;
pool_init(&exclude, 0);
while ((i = getopt(argc, argv, "l:n:z:Z:d:D:o:x:f")) != -1) {
while ((i = getopt(argc, argv, "l:n:z:Z:d:D:o:x:r:f")) != -1) {
switch (i) {
case 'n':
name = optarg;
@ -583,12 +584,16 @@ int main(int argc, char **argv) {
pool(&exclude, optarg, VT_STRING);
break;
case 'r':
droprate = atof(optarg);
break;
case 'f':
force = 1;
break;
default:
fprintf(stderr, "Usage: %s -o out.mbtiles [-n name] [-l layername] [-z maxzoom] [-Z minzoom] [-d detail] [-D lower-detail] [-x excluded-field ...] [file.json]\n", argv[0]);
fprintf(stderr, "Usage: %s -o out.mbtiles [-n name] [-l layername] [-z maxzoom] [-Z minzoom] [-d detail] [-D lower-detail] [-x excluded-field ...] [-r droprate] [file.json]\n", argv[0]);
exit(EXIT_FAILURE);
}
}
@ -611,7 +616,7 @@ int main(int argc, char **argv) {
if (f == NULL) {
fprintf(stderr, "%s: %s: %s\n", argv[0], argv[i], strerror(errno));
} else {
read_json(f, name ? name : argv[i], layer, maxzoom, minzoom, outdb, &exclude);
read_json(f, name ? name : argv[i], layer, maxzoom, minzoom, outdb, &exclude, droprate);
fclose(f);
}
}
@ -619,7 +624,7 @@ int main(int argc, char **argv) {
fprintf(stderr, "%s: Only accepts one input file\n", argv[0]);
exit(EXIT_FAILURE);
} else {
read_json(stdin, name ? name : outdir, layer, maxzoom, minzoom, outdb, &exclude);
read_json(stdin, name ? name : outdir, layer, maxzoom, minzoom, outdb, &exclude, droprate);
}
mbtiles_close(outdb, argv);

8
tile.cc
View File

@ -230,9 +230,9 @@ drawvec remove_noop(drawvec geom, int type) {
return out;
}
drawvec shrink_lines(drawvec &geom, int z, int detail, int basezoom, long long *here) {
drawvec shrink_lines(drawvec &geom, int z, int detail, int basezoom, long long *here, double droprate) {
long long res = 200LL << (32 - 8 - z);
long long portion = res / exp(log(sqrt(2.5)) * (basezoom - z));
long long portion = res / exp(log(sqrt(droprate)) * (basezoom - z));
unsigned i;
drawvec out;
@ -642,7 +642,7 @@ int coalindexcmp(const struct coalesce *c1, const struct coalesce *c2) {
return cmp;
}
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, char *layername, sqlite3 *outdb) {
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, char *layername, sqlite3 *outdb, double droprate) {
int line_detail;
for (line_detail = detail; line_detail >= 7; line_detail--) {
@ -667,7 +667,7 @@ long long write_tile(struct index *start, struct index *end, char *metabase, uns
long long along = 0;
if (z < basezoom) {
interval = exp(log(2.5) * (basezoom - z));
interval = exp(log(droprate) * (basezoom - z));
}
std::vector<coalesce> features;

2
tile.h
View File

@ -25,4 +25,4 @@ struct index {
};
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, char *layername, sqlite3 *outdb);
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, char *layername, sqlite3 *outdb, double droprate);