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Carry sum of numeric attributes into the bins

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Erica Fischer
2024-08-29 13:24:12 -07:00
parent 2ee982c54f
commit 8bd955ae5b
4 changed files with 64 additions and 4 deletions
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clip.cpp
+28 -2
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@@ -1319,7 +1319,8 @@ mvt_tile assign_to_bins(mvt_tile const &features, std::vector<mvt_layer> const &
std::sort(events.begin(), events.end());
std::set<active_bin> active;
std::vector<size_t> counters; // separate because set items can't be mutated from an iterator
std::vector<size_t> counters; // separate because set items can't be mutated from an iterator
std::vector<std::map<std::string, double>> sums; // separate because set items can't be mutated from an iterator
mvt_layer outlayer;
outlayer.extent = 1 << detail;
@@ -1335,10 +1336,12 @@ mvt_tile assign_to_bins(mvt_tile const &features, std::vector<mvt_layer> const &
outfeature.geometry = bin.geometry;
outfeature.type = bin.type;
a.outfeature = outlayer.features.size();
a.counter = counters.size();
counters.push_back(0);
sums.emplace_back();
outlayer.features.push_back(std::move(outfeature));
counters.push_back(0);
active.insert(std::move(a));
} else if (e.kind == index_event::CHECK) {
auto const &feature = features.layers[e.layer].features[e.feature];
@@ -1363,6 +1366,22 @@ mvt_tile assign_to_bins(mvt_tile const &features, std::vector<mvt_layer> const &
printf("\n");
#endif
counters[a.counter]++;
for (size_t i = 0; i + 1 < feature.tags.size(); i += 2) {
const mvt_value &val = features.layers[e.layer].values[feature.tags[i + 1]];
const std::string &key = features.layers[e.layer].keys[feature.tags[i]];
if (val.is_numeric()) {
auto find_attr = sums[a.counter].find(key);
if (find_attr == sums[a.counter].end()) {
sums[a.counter].emplace(key, 0);
find_attr = sums[a.counter].find(key);
}
find_attr->second += mvt_value_to_double(val);
}
}
break;
}
}
@@ -1384,6 +1403,13 @@ mvt_tile assign_to_bins(mvt_tile const &features, std::vector<mvt_layer> const &
v.type = mvt_uint;
v.numeric_value.uint_value = counters[found->counter];
outlayer.tag(outfeature, "bin-count", v);
for (auto const &kv : sums[found->counter]) {
mvt_value v2;
v2.type = mvt_double;
v2.numeric_value.double_value = kv.second;
outlayer.tag(outfeature, "tippecanoe:sum:" + kv.first, v2);
}
} else {
outfeature.geometry.clear();
}