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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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tile.cc
+4 -4
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@@ -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;