diegoripley/tippecanoe
1
0
Fork 0
mirror of https://github.com/felt/tippecanoe.git synced 2026-10-02 08:25:40 +02:00
Code Issues Packages Projects Releases Wiki Activity

Tests of the three current strategies for reducing tile size

Browse Source
This commit is contained in:
Eric Fischer
2016-10-24 15:33:14 -07:00
parent 7cb7fc4913
commit f32916c472
8 changed files with 46772 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tile.cpp
+12 -5
View File
@@ -900,6 +900,8 @@ void find_common_edges(std::vector<partial> &partials, int z, int line_detail, d
}
}
// Simplify each arc
std::vector<drawvec> simplified_arcs;
size_t count = 0;
@@ -924,6 +926,9 @@ void find_common_edges(std::vector<partial> &partials, int z, int line_detail, d
count++;
}
// If necessary, merge some adjacent polygons into some other polygons
#if 0
for (size_t i = 0; i < partials.size(); i++) {
for (size_t j = 0; j < partials[i].arc_polygon.size(); j++) {
if (merge_candidates.count(-partials[i].arc_polygon[j]) > 0) {
@@ -1033,7 +1038,9 @@ void find_common_edges(std::vector<partial> &partials, int z, int line_detail, d
}
}
}
#endif
// Turn the arc representations of the polygons back into standard polygon geometries
for (size_t i = 0; i < partials.size(); i++) {
if (partials[i].t == VT_POLYGON) {
@@ -1599,7 +1606,7 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
}
line_detail++; // to keep it the same when the loop decrements it
continue;
} else if (additional[A_INCREASE_GAMMA_AS_NEEDED]) {
} else if (additional[A_INCREASE_GAMMA_AS_NEEDED] && gamma < 10) {
if (gamma < 1) {
gamma = 1;
} else {
@@ -1619,21 +1626,21 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
std::string compressed = tile.encode();
if (compressed.size() > 500000 && !prevent[P_KILOBYTE_LIMIT]) {
if (compressed.size() > max_tile_size && !prevent[P_KILOBYTE_LIMIT]) {
if (!quiet) {
fprintf(stderr, "tile %d/%u/%u size is %lld with detail %d, >500000 \n", z, tx, ty, (long long) compressed.size(), line_detail);
fprintf(stderr, "tile %d/%u/%u size is %lld with detail %d, >%zu \n", z, tx, ty, (long long) compressed.size(), line_detail, max_tile_size);
}
if (prevent[P_DYNAMIC_DROP]) {
// The 95% is a guess to avoid too many retries
// and probably actually varies based on how much duplicated metadata there is
fraction = fraction * 500000 / compressed.size() * 0.95;
fraction = fraction * max_tile_size / compressed.size() * 0.95;
if (!quiet) {
fprintf(stderr, "Going to try keeping %0.2f%% of the features to make it fit\n", fraction * 100);
}
line_detail++; // to keep it the same when the loop decrements it
} else if (additional[A_INCREASE_GAMMA_AS_NEEDED]) {
} else if (additional[A_INCREASE_GAMMA_AS_NEEDED] && gamma < 10) {
if (gamma < 1) {
gamma = 1;
} else {