1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
#include <mbgl/style/sources/geojson_source_impl.hpp>
#include <mbgl/tile/tile_id.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/feature.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/thread_pool.hpp>
#include <mapbox/geojsonvt.hpp>
#include <supercluster.hpp>
#include <cmath>
namespace mbgl {
namespace style {
class GeoJSONVTData : public GeoJSONData {
public:
void getTile(const CanonicalTileID& id, const std::function<void(TileFeatures)>& fn) final {
assert(fn);
scheduler->scheduleAndReplyValue(
[id, impl = this->impl]() -> TileFeatures { return impl->getTile(id.z, id.x, id.y).features; }, fn);
}
Features getChildren(const std::uint32_t) final { return {}; }
Features getLeaves(const std::uint32_t, const std::uint32_t, const std::uint32_t) final { return {}; }
std::uint8_t getClusterExpansionZoom(std::uint32_t) final {
return 0;
}
private:
friend GeoJSONData;
GeoJSONVTData(const GeoJSON& geoJSON, const mapbox::geojsonvt::Options& options)
: impl(std::make_shared<mapbox::geojsonvt::GeoJSONVT>(geoJSON, options)),
scheduler(Scheduler::GetSequenced()) {}
std::shared_ptr<mapbox::geojsonvt::GeoJSONVT> impl; // Accessed on worker thread.
std::shared_ptr<Scheduler> scheduler;
};
class SuperclusterData : public GeoJSONData {
public:
void getTile(const CanonicalTileID& id, const std::function<void(TileFeatures)>& fn) final {
assert(fn);
fn(impl.getTile(id.z, id.x, id.y));
}
Features getChildren(const std::uint32_t cluster_id) final { return impl.getChildren(cluster_id); }
Features getLeaves(const std::uint32_t cluster_id, const std::uint32_t limit, const std::uint32_t offset) final {
return impl.getLeaves(cluster_id, limit, offset);
}
std::uint8_t getClusterExpansionZoom(std::uint32_t cluster_id) final {
return impl.getClusterExpansionZoom(cluster_id);
}
private:
friend GeoJSONData;
SuperclusterData(const Features& features, const mapbox::supercluster::Options& options)
: impl(features, options) {}
mapbox::supercluster::Supercluster impl;
};
template <class T>
T evaluateFeature(const mapbox::feature::feature<double>& f,
const std::shared_ptr<expression::Expression>& expression,
optional<T> accumulated = nullopt) {
const expression::EvaluationResult result = expression->evaluate(accumulated, f);
if (result) {
optional<T> typed = expression::fromExpressionValue<T>(*result);
if (typed) {
return std::move(*typed);
}
}
return T();
}
// static
std::shared_ptr<GeoJSONData> GeoJSONData::create(const GeoJSON& geoJSON, Immutable<GeoJSONOptions> options) {
constexpr double scale = util::EXTENT / util::tileSize;
if (options->cluster && geoJSON.is<Features>() && !geoJSON.get<Features>().empty()) {
mapbox::supercluster::Options clusterOptions;
clusterOptions.maxZoom = options->clusterMaxZoom;
clusterOptions.extent = util::EXTENT;
clusterOptions.radius = ::round(scale * options->clusterRadius);
auto feature = std::make_shared<Feature>();
clusterOptions.map = [feature, options](const PropertyMap& properties) -> PropertyMap {
PropertyMap ret{};
if (properties.empty()) return ret;
for (const auto& p : options->clusterProperties) {
feature->properties = properties;
ret[p.first] = evaluateFeature<Value>(*feature, p.second.first);
}
return ret;
};
clusterOptions.reduce = [feature, options](PropertyMap& toReturn, const PropertyMap& toFill) {
for (const auto& p : options->clusterProperties) {
if (toFill.count(p.first) == 0) {
continue;
}
feature->properties = toFill;
optional<Value> accumulated(toReturn[p.first]);
toReturn[p.first] = evaluateFeature<Value>(*feature, p.second.second, accumulated);
}
};
return std::shared_ptr<GeoJSONData>(new SuperclusterData(geoJSON.get<Features>(), clusterOptions));
}
mapbox::geojsonvt::Options vtOptions;
vtOptions.maxZoom = options->maxzoom;
vtOptions.extent = util::EXTENT;
vtOptions.buffer = ::round(scale * options->buffer);
vtOptions.tolerance = scale * options->tolerance;
vtOptions.lineMetrics = options->lineMetrics;
return std::shared_ptr<GeoJSONData>(new GeoJSONVTData(geoJSON, vtOptions));
}
GeoJSONSource::Impl::Impl(std::string id_, Immutable<GeoJSONOptions> options_)
: Source::Impl(SourceType::GeoJSON, std::move(id_)), options(std::move(options_)) {}
GeoJSONSource::Impl::Impl(const GeoJSONSource::Impl& other, std::shared_ptr<GeoJSONData> data_)
: Source::Impl(other), options(other.options), data(std::move(data_)) {}
GeoJSONSource::Impl::~Impl() = default;
Range<uint8_t> GeoJSONSource::Impl::getZoomRange() const {
return {options->minzoom, options->maxzoom};
}
std::weak_ptr<GeoJSONData> GeoJSONSource::Impl::getData() const {
return data;
}
optional<std::string> GeoJSONSource::Impl::getAttribution() const {
return {};
}
} // namespace style
} // namespace mbgl
|
