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mapnik_vector_tile_json.cpp
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1121 lines (1059 loc) · 39.2 KB
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//
#include "mapnik_vector_tile.hpp"
// mapnik
#include <mapnik/util/geometry_to_geojson.hpp>
#include <mapnik/util/feature_to_geojson.hpp>
#include <mapnik/projection.hpp>
#include <mapnik/proj_transform.hpp>
#include <mapnik/geometry/reprojection.hpp>
#include <mapnik/datasource_cache.hpp>
// mapnik-vector-tile
#include "vector_tile_compression.hpp"
#include "vector_tile_composite.hpp"
#include "vector_tile_processor.hpp"
#include "vector_tile_projection.hpp"
#include "vector_tile_geometry_decoder.hpp"
#include "vector_tile_load_tile.hpp"
#include "object_to_container.hpp"
namespace {
struct geometry_type_name
{
template <typename T>
std::string operator()(T const& geom) const
{
return mapnik::util::apply_visitor(*this, geom);
}
std::string operator()(mapnik::geometry::geometry_empty const&) const
{
// LCOV_EXCL_START
return "Empty";
// LCOV_EXCL_STOP
}
template <typename T>
std::string operator()(mapnik::geometry::point<T> const&) const
{
return "Point";
}
template <typename T>
std::string operator()(mapnik::geometry::line_string<T> const&) const
{
return "LineString";
}
template <typename T>
std::string operator()(mapnik::geometry::polygon<T> const&) const
{
return "Polygon";
}
template <typename T>
std::string operator()(mapnik::geometry::multi_point<T> const&) const
{
return "MultiPoint";
}
template <typename T>
std::string operator()(mapnik::geometry::multi_line_string<T> const&) const
{
return "MultiLineString";
}
template <typename T>
std::string operator()(mapnik::geometry::multi_polygon<T> const&) const
{
return "MultiPolygon";
}
template <typename T>
std::string operator()(mapnik::geometry::geometry_collection<T> const&) const
{
// LCOV_EXCL_START
return "GeometryCollection";
// LCOV_EXCL_STOP
}
};
template <typename T>
static inline std::string geometry_type_as_string(T const& geom)
{
return geometry_type_name()(geom);
}
struct geometry_array_visitor
{
geometry_array_visitor(Napi::Env env)
: env_(env) {}
Napi::Array operator()(mapnik::geometry::geometry_empty const&)
{
// Removed as it should be a bug if a vector tile has reached this point
// therefore no known tests reach this point
// LCOV_EXCL_START
return Napi::Array::New(env_);
// LCOV_EXCL_STOP
}
template <typename T>
Napi::Array operator()(mapnik::geometry::point<T> const& geom)
{
Napi::Array arr = Napi::Array::New(env_, 2);
arr.Set(0u, Napi::Number::New(env_, geom.x));
arr.Set(1u, Napi::Number::New(env_, geom.y));
return arr;
}
template <typename T>
Napi::Array operator()(mapnik::geometry::line_string<T> const& geom)
{
if (geom.empty())
{
// Removed as it should be a bug if a vector tile has reached this point
// therefore no known tests reach this point
// LCOV_EXCL_START
return Napi::Array::New(env_);
// LCOV_EXCL_STOP
}
Napi::Array arr = Napi::Array::New(env_, geom.size());
std::uint32_t c = 0;
for (auto const& pt : geom)
{
arr.Set(c++, (*this)(pt));
}
return arr;
}
template <typename T>
Napi::Array operator()(mapnik::geometry::linear_ring<T> const& geom)
{
if (geom.empty())
{
// Removed as it should be a bug if a vector tile has reached this point
// therefore no known tests reach this point
// LCOV_EXCL_START
return Napi::Array::New(env_);
// LCOV_EXCL_STOP
}
Napi::Array arr = Napi::Array::New(env_, geom.size());
std::uint32_t c = 0;
for (auto const& pt : geom)
{
arr.Set(c++, (*this)(pt));
}
return arr;
}
template <typename T>
Napi::Array operator()(mapnik::geometry::multi_point<T> const& geom)
{
if (geom.empty())
{
// Removed as it should be a bug if a vector tile has reached this point
// therefore no known tests reach this point
// LCOV_EXCL_START
return Napi::Array::New(env_);
// LCOV_EXCL_STOP
}
Napi::Array arr = Napi::Array::New(env_, geom.size());
std::uint32_t c = 0;
for (auto const& pt : geom)
{
arr.Set(c++, (*this)(pt));
}
return arr;
}
template <typename T>
Napi::Array operator()(mapnik::geometry::multi_line_string<T> const& geom)
{
if (geom.empty())
{
// Removed as it should be a bug if a vector tile has reached this point
// therefore no known tests reach this point
// LCOV_EXCL_START
return Napi::Array::New(env_);
// LCOV_EXCL_STOP
}
Napi::Array arr = Napi::Array::New(env_, geom.size());
std::uint32_t c = 0;
for (auto const& pt : geom)
{
arr.Set(c++, (*this)(pt));
}
return arr;
}
template <typename T>
Napi::Array operator()(mapnik::geometry::polygon<T> const& poly)
{
Napi::Array arr = Napi::Array::New(env_, poly.size());
std::uint32_t index = 0;
for (auto const& ring : poly)
{
arr.Set(index++, (*this)(ring));
}
return arr;
}
template <typename T>
Napi::Array operator()(mapnik::geometry::multi_polygon<T> const& geom)
{
if (geom.empty())
{
// Removed as it should be a bug if a vector tile has reached this point
// therefore no known tests reach this point
// LCOV_EXCL_START
return Napi::Array::New(env_);
// LCOV_EXCL_STOP
}
Napi::Array arr = Napi::Array::New(env_, geom.size());
std::uint32_t c = 0;
for (auto const& pt : geom)
{
arr.Set(c++, (*this)(pt));
}
return arr;
}
template <typename T>
Napi::Array operator()(mapnik::geometry::geometry<T> const& geom)
{
// Removed as it should be a bug if a vector tile has reached this point
// therefore no known tests reach this point
// LCOV_EXCL_START
return mapnik::util::apply_visitor((*this), geom);
// LCOV_EXCL_STOP
}
template <typename T>
Napi::Array operator()(mapnik::geometry::geometry_collection<T> const& geom)
{
// Removed as it should be a bug if a vector tile has reached this point
// therefore no known tests reach this point
// LCOV_EXCL_START
if (geom.empty())
{
return Napi::Array::New(env_);
}
Napi::Array arr = Napi::Array::New(env_, geom.size());
std::uint32_t c = 0;
for (auto const& pt : geom)
{
arr.Set(c++, (*this)(pt));
}
return arr;
// LCOV_EXCL_STOP
}
private:
Napi::Env env_;
};
template <typename T>
Napi::Array geometry_to_array(Napi::Env const& env, mapnik::geometry::geometry<T> const& geom)
{
return mapnik::util::apply_visitor(geometry_array_visitor(env), geom);
}
struct json_value_visitor
{
json_value_visitor(Napi::Env env, Napi::Object& att_obj,
std::string const& name)
: env_(env), att_obj_(att_obj), name_(name) {}
void operator()(std::string const& val)
{
att_obj_.Set(name_, val);
}
void operator()(bool const& val)
{
att_obj_.Set(name_, Napi::Boolean::New(env_, val));
}
void operator()(int64_t const& val)
{
att_obj_.Set(name_, Napi::Number::New(env_, val));
}
void operator()(uint64_t const& val)
{
// LCOV_EXCL_START
att_obj_.Set(name_, Napi::Number::New(env_, val));
// LCOV_EXCL_STOP
}
void operator()(double const& val)
{
att_obj_.Set(name_, Napi::Number::New(env_, val));
}
void operator()(float const& val)
{
att_obj_.Set(name_, Napi::Number::New(env_, val));
}
Napi::Env env_;
Napi::Object& att_obj_;
std::string const& name_;
};
enum geojson_write_type : std::uint8_t
{
geojson_write_all = 0,
geojson_write_array,
geojson_write_layer_name,
geojson_write_layer_index
};
bool layer_to_geojson(protozero::pbf_reader const& layer,
std::string& result,
unsigned x,
unsigned y,
unsigned z)
{
mapnik::vector_tile_impl::tile_datasource_pbf ds(layer, x, y, z);
mapnik::projection wgs84("epsg:4326", true);
mapnik::projection merc("epsg:3857", true);
mapnik::proj_transform prj_trans(merc, wgs84);
// This mega box ensures we capture all features, including those
// outside the tile extent. Geometries outside the tile extent are
// likely when the vtile was created by clipping to a buffered extent
mapnik::query q(mapnik::box2d<double>(std::numeric_limits<double>::lowest(),
std::numeric_limits<double>::lowest(),
std::numeric_limits<double>::max(),
std::numeric_limits<double>::max()));
mapnik::layer_descriptor ld = ds.get_descriptor();
for (auto const& item : ld.get_descriptors())
{
q.add_property_name(item.get_name());
}
mapnik::featureset_ptr fs = ds.features(q);
bool first = true;
if (fs && !mapnik::is_empty(fs))
{
mapnik::feature_ptr feature;
while ((feature = fs->next()))
{
if (first)
{
first = false;
}
else
{
result += "\n,";
}
std::string feature_str;
mapnik::feature_impl feature_new(feature->context(), feature->id());
feature_new.set_data(feature->get_data());
unsigned int n_err = 0;
feature_new.set_geometry(mapnik::geometry::reproject_copy(feature->get_geometry(), prj_trans, n_err));
if (!mapnik::util::to_geojson(feature_str, feature_new))
{
// LCOV_EXCL_START
throw std::runtime_error("Failed to generate GeoJSON geometry");
// LCOV_EXCL_STOP
}
result += feature_str;
}
}
return !first;
}
void write_geojson_array(std::string& result,
mapnik::vector_tile_impl::merc_tile_ptr const& tile)
{
protozero::pbf_reader tile_msg = tile->get_reader();
result += "[";
bool first = true;
while (tile_msg.next(mapnik::vector_tile_impl::Tile_Encoding::LAYERS))
{
if (first)
{
first = false;
}
else
{
result += ",";
}
auto data_view = tile_msg.get_view();
protozero::pbf_reader layer_msg(data_view);
protozero::pbf_reader name_msg(data_view);
std::string layer_name;
if (name_msg.next(mapnik::vector_tile_impl::Layer_Encoding::NAME))
{
layer_name = name_msg.get_string();
}
result += "{\"type\":\"FeatureCollection\",";
result += "\"name\":\"" + layer_name + "\",\"features\":[";
std::string features;
bool hit = layer_to_geojson(layer_msg,
features,
tile->x(),
tile->y(),
tile->z());
if (hit)
{
result += features;
}
result += "]}";
}
result += "]";
}
void write_geojson_all(std::string& result,
mapnik::vector_tile_impl::merc_tile_ptr const& tile)
{
protozero::pbf_reader tile_msg = tile->get_reader();
result += "{\"type\":\"FeatureCollection\",\"features\":[";
bool first = true;
while (tile_msg.next(mapnik::vector_tile_impl::Tile_Encoding::LAYERS))
{
protozero::pbf_reader layer_msg(tile_msg.get_message());
std::string features;
bool hit = layer_to_geojson(layer_msg,
features,
tile->x(),
tile->y(),
tile->z());
if (hit)
{
if (first)
{
first = false;
}
else
{
result += ",";
}
result += features;
}
}
result += "]}";
}
bool write_geojson_layer_index(std::string& result,
std::size_t layer_idx,
mapnik::vector_tile_impl::merc_tile_ptr const& tile)
{
protozero::pbf_reader layer_msg;
if (tile->layer_reader(layer_idx, layer_msg) &&
tile->get_layers().size() > layer_idx)
{
std::string layer_name = tile->get_layers()[layer_idx];
result += "{\"type\":\"FeatureCollection\",";
result += "\"name\":\"" + layer_name + "\",\"features\":[";
layer_to_geojson(layer_msg,
result,
tile->x(),
tile->y(),
tile->z());
result += "]}";
return true;
}
// LCOV_EXCL_START
return false;
// LCOV_EXCL_STOP
}
bool write_geojson_layer_name(std::string& result,
std::string const& name,
mapnik::vector_tile_impl::merc_tile_ptr const& tile)
{
protozero::pbf_reader layer_msg;
if (tile->layer_reader(name, layer_msg))
{
result += "{\"type\":\"FeatureCollection\",";
result += "\"name\":\"" + name + "\",\"features\":[";
layer_to_geojson(layer_msg,
result,
tile->x(),
tile->y(),
tile->z());
result += "]}";
return true;
}
return false;
}
struct AsyncToGeoJSON : Napi::AsyncWorker
{
using Base = Napi::AsyncWorker;
AsyncToGeoJSON(mapnik::vector_tile_impl::merc_tile_ptr const& tile,
geojson_write_type type, int layer_idx, std::string const& layer_name,
Napi::Function const& callback)
: Base(callback),
tile_(tile),
type_(type),
layer_idx_(layer_idx),
layer_name_(layer_name)
{
}
void Execute() override
{
try
{
switch (type_)
{
default:
case geojson_write_all:
write_geojson_all(result_, tile_);
break;
case geojson_write_array:
write_geojson_array(result_, tile_);
break;
case geojson_write_layer_name:
write_geojson_layer_name(result_, layer_name_, tile_);
break;
case geojson_write_layer_index:
write_geojson_layer_index(result_, layer_idx_, tile_);
break;
}
}
catch (std::exception const& ex)
{
SetError(ex.what());
}
}
std::vector<napi_value> GetResult(Napi::Env env) override
{
return {env.Undefined(), Napi::String::New(env, result_)};
}
private:
mapnik::vector_tile_impl::merc_tile_ptr tile_;
geojson_write_type type_;
int layer_idx_;
std::string layer_name_;
std::string result_;
};
} // namespace
/**
* Get a JSON representation of this tile
*
* @memberof VectorTile
* @instance
* @name toJSON
* @param {Object} [options]
* @param {boolean} [options.decode_geometry=false] return geometry as integers
* relative to the tile grid
* @returns {Object} json representation of this tile with name, extent,
* version, and feature properties
* @example
* var vt = mapnik.VectorTile(10,131,242);
* var buffer = fs.readFileSync('./path/to/data.mvt');
* vt.setData(buffer);
* var json = vectorTile.toJSON();
* console.log(json);
* // {
* // name: 'layer-name',
* // extent: 4096,
* // version: 2,
* // features: [ ... ] // array of objects
* // }
*/
Napi::Value VectorTile::toJSON(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
bool decode_geometry = false;
if (info.Length() >= 1)
{
if (!info[0].IsObject())
{
Napi::Error::New(env, "The first argument must be an object").ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::Object options = info[0].As<Napi::Object>();
if (options.Has("decode_geometry"))
{
Napi::Value param_val = options.Get("decode_geometry");
if (!param_val.IsBoolean())
{
Napi::Error::New(env, "option 'decode_geometry' must be a boolean").ThrowAsJavaScriptException();
return env.Undefined();
}
decode_geometry = param_val.As<Napi::Boolean>();
}
}
try
{
protozero::pbf_reader tile_msg = tile_->get_reader();
Napi::Array arr = Napi::Array::New(env, tile_->get_layers().size());
std::size_t l_idx = 0;
while (tile_msg.next(mapnik::vector_tile_impl::Tile_Encoding::LAYERS))
{
protozero::pbf_reader layer_msg = tile_msg.get_message();
Napi::Object layer_obj = Napi::Object::New(env);
std::vector<std::string> layer_keys;
mapnik::vector_tile_impl::layer_pbf_attr_type layer_values;
std::vector<protozero::pbf_reader> layer_features;
protozero::pbf_reader val_msg;
std::uint32_t version = 1;
while (layer_msg.next())
{
switch (layer_msg.tag())
{
case mapnik::vector_tile_impl::Layer_Encoding::NAME:
layer_obj.Set("name", layer_msg.get_string());
break;
case mapnik::vector_tile_impl::Layer_Encoding::FEATURES:
layer_features.push_back(layer_msg.get_message());
break;
case mapnik::vector_tile_impl::Layer_Encoding::KEYS:
layer_keys.push_back(layer_msg.get_string());
break;
case mapnik::vector_tile_impl::Layer_Encoding::VALUES:
val_msg = layer_msg.get_message();
while (val_msg.next())
{
switch (val_msg.tag())
{
case mapnik::vector_tile_impl::Value_Encoding::STRING:
layer_values.push_back(val_msg.get_string());
break;
case mapnik::vector_tile_impl::Value_Encoding::FLOAT:
layer_values.push_back(val_msg.get_float());
break;
case mapnik::vector_tile_impl::Value_Encoding::DOUBLE:
layer_values.push_back(val_msg.get_double());
break;
case mapnik::vector_tile_impl::Value_Encoding::INT:
layer_values.push_back(val_msg.get_int64());
break;
case mapnik::vector_tile_impl::Value_Encoding::UINT:
// LCOV_EXCL_START
layer_values.push_back(val_msg.get_uint64());
break;
// LCOV_EXCL_STOP
case mapnik::vector_tile_impl::Value_Encoding::SINT:
// LCOV_EXCL_START
layer_values.push_back(val_msg.get_sint64());
break;
// LCOV_EXCL_STOP
case mapnik::vector_tile_impl::Value_Encoding::BOOL:
layer_values.push_back(val_msg.get_bool());
break;
default:
// LCOV_EXCL_START
val_msg.skip();
break;
// LCOV_EXCL_STOP
}
}
break;
case mapnik::vector_tile_impl::Layer_Encoding::EXTENT:
layer_obj.Set("extent", Napi::Number::New(env, layer_msg.get_uint32()));
break;
case mapnik::vector_tile_impl::Layer_Encoding::VERSION:
version = layer_msg.get_uint32();
layer_obj.Set("version", Napi::Number::New(env, version));
break;
default:
// LCOV_EXCL_START
layer_msg.skip();
break;
// LCOV_EXCL_STOP
}
}
Napi::Array f_arr = Napi::Array::New(env, layer_features.size());
std::size_t f_idx = 0;
for (auto feature_msg : layer_features)
{
Napi::Object feature_obj = Napi::Object::New(env);
mapnik::vector_tile_impl::GeometryPBF::pbf_itr geom_itr;
mapnik::vector_tile_impl::GeometryPBF::pbf_itr tag_itr;
bool has_geom = false;
bool has_geom_type = false;
bool has_tags = false;
std::int32_t geom_type_enum = 0;
while (feature_msg.next())
{
switch (feature_msg.tag())
{
case mapnik::vector_tile_impl::Feature_Encoding::ID:
feature_obj.Set("id", Napi::Number::New(env, feature_msg.get_uint64()));
break;
case mapnik::vector_tile_impl::Feature_Encoding::TAGS:
tag_itr = feature_msg.get_packed_uint32();
has_tags = true;
break;
case mapnik::vector_tile_impl::Feature_Encoding::TYPE:
geom_type_enum = feature_msg.get_enum();
has_geom_type = true;
feature_obj.Set("type", Napi::Number::New(env, geom_type_enum));
break;
case mapnik::vector_tile_impl::Feature_Encoding::GEOMETRY:
geom_itr = feature_msg.get_packed_uint32();
has_geom = true;
break;
case mapnik::vector_tile_impl::Feature_Encoding::RASTER: {
auto im_buffer = feature_msg.get_view();
feature_obj.Set("raster",
Napi::Buffer<char>::Copy(env, im_buffer.data(), im_buffer.size()));
break;
}
default:
// LCOV_EXCL_START
feature_msg.skip();
break;
// LCOV_EXCL_STOP
}
}
Napi::Object att_obj = Napi::Object::New(env);
if (has_tags)
{
for (auto _i = tag_itr.begin(); _i != tag_itr.end();)
{
std::size_t key_name = *(_i++);
if (_i == tag_itr.end())
{
break;
}
std::size_t key_value = *(_i++);
if (key_name < layer_keys.size() &&
key_value < layer_values.size())
{
std::string const& name = layer_keys.at(key_name);
mapnik::vector_tile_impl::pbf_attr_value_type val = layer_values.at(key_value);
json_value_visitor vv(env, att_obj, name);
mapnik::util::apply_visitor(vv, val);
}
}
}
feature_obj.Set("properties", att_obj);
if (has_geom && has_geom_type)
{
if (decode_geometry)
{
// Decode the geometry first into an int64_t mapnik geometry
mapnik::vector_tile_impl::GeometryPBF geoms(geom_itr);
mapnik::geometry::geometry<std::int64_t> geom = mapnik::vector_tile_impl::decode_geometry<std::int64_t>(geoms, geom_type_enum, version, 0, 0, 1.0, 1.0);
Napi::Array g_arr = geometry_to_array<std::int64_t>(env, geom);
feature_obj.Set("geometry", g_arr);
std::string geom_type = geometry_type_as_string(geom);
feature_obj.Set("geometry_type", geom_type);
}
else
{
std::vector<std::uint32_t> geom_vec;
for (auto _i = geom_itr.begin(); _i != geom_itr.end(); ++_i)
{
geom_vec.push_back(*_i);
}
Napi::Array g_arr = Napi::Array::New(env, geom_vec.size());
for (std::size_t k = 0; k < geom_vec.size(); ++k)
{
g_arr.Set(k, Napi::Number::New(env, geom_vec[k]));
}
feature_obj.Set("geometry", g_arr);
}
}
f_arr.Set(f_idx++, feature_obj);
}
layer_obj.Set("features", f_arr);
arr.Set(l_idx++, layer_obj);
}
return scope.Escape(arr);
}
catch (std::exception const& ex)
{
// LCOV_EXCL_START
Napi::Error::New(env, ex.what()).ThrowAsJavaScriptException();
return env.Undefined();
// LCOV_EXCL_STOP
}
}
/**
* Syncronous version of {@link VectorTile}
*
* @memberof VectorTile
* @instance
* @name toGeoJSONSync
* @param {string | number} [layer=__all__] Can be a zero-index integer representing
* a layer or the string keywords `__array__` or `__all__` to get all layers in the form
* of an array of GeoJSON `FeatureCollection`s or in the form of a single GeoJSON
* `FeatureCollection` with all layers smooshed inside
* @returns {string} stringified GeoJSON of all the features in this tile.
* @example
* var geojson = vectorTile.toGeoJSONSync('__all__');
* geojson // stringified GeoJSON
* JSON.parse(geojson); // GeoJSON object
*/
Napi::Value VectorTile::toGeoJSONSync(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
Napi::EscapableHandleScope scope(env);
if (info.Length() == 0)
{
Napi::Error::New(env, "first argument must be either a layer name (string) or layer index (integer)").ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::Value layer_id = info[0];
if (!(layer_id.IsString() || layer_id.IsNumber()))
{
Napi::TypeError::New(env, "'layer' argument must be either a layer name (string) or layer index (integer)").ThrowAsJavaScriptException();
return env.Undefined();
}
std::string result;
try
{
if (layer_id.IsString())
{
std::string layer_name = layer_id.As<Napi::String>();
if (layer_name == "__array__")
{
write_geojson_array(result, tile_);
}
else if (layer_name == "__all__")
{
write_geojson_all(result, tile_);
}
else
{
if (!write_geojson_layer_name(result, layer_name, tile_))
{
std::string error_msg("Layer name '" + layer_name + "' not found");
Napi::TypeError::New(env, error_msg.c_str()).ThrowAsJavaScriptException();
return env.Undefined();
}
}
}
else if (layer_id.IsNumber())
{
int layer_idx = layer_id.As<Napi::Number>().Int32Value();
if (layer_idx < 0)
{
Napi::TypeError::New(env, "A layer index can not be negative").ThrowAsJavaScriptException();
return env.Undefined();
}
else if (layer_idx >= static_cast<int>(tile_->get_layers().size()))
{
Napi::TypeError::New(env, "Layer index exceeds the number of layers in the vector tile.").ThrowAsJavaScriptException();
return env.Undefined();
}
if (!write_geojson_layer_index(result, layer_idx, tile_))
{
// LCOV_EXCL_START
Napi::TypeError::New(env, "Layer could not be retrieved (should have not reached here)").ThrowAsJavaScriptException();
return env.Undefined();
// LCOV_EXCL_STOP
}
}
}
catch (std::exception const& ex)
{
// LCOV_EXCL_START
Napi::TypeError::New(env, ex.what()).ThrowAsJavaScriptException();
return env.Undefined();
// LCOV_EXCL_STOP
}
return scope.Escape(Napi::String::New(env, result));
}
/**
* Get a [GeoJSON](http://geojson.org/) representation of this tile
*
* @memberof VectorTile
* @instance
* @name toGeoJSON
* @param {string | number} [layer=__all__] Can be a zero-index integer representing
* a layer or the string keywords `__array__` or `__all__` to get all layers in the form
* of an array of GeoJSON `FeatureCollection`s or in the form of a single GeoJSON
* `FeatureCollection` with all layers smooshed inside
* @param {Function} callback - `function(err, geojson)`: a stringified
* GeoJSON of all the features in this tile
* @example
* vectorTile.toGeoJSON('__all__',function(err, geojson) {
* if (err) throw err;
* console.log(geojson); // stringified GeoJSON
* console.log(JSON.parse(geojson)); // GeoJSON object
* });
*/
Napi::Value VectorTile::toGeoJSON(Napi::CallbackInfo const& info)
{
if ((info.Length() < 1) || !info[info.Length() - 1].IsFunction())
{
return toGeoJSONSync(info);
}
Napi::Env env = info.Env();
Napi::Value layer_id = info[0];
if (!(layer_id.IsString() || layer_id.IsNumber()))
{
Napi::TypeError::New(env, "'layer' argument must be either a layer name (string) or layer index (integer)").ThrowAsJavaScriptException();
return env.Undefined();
}
geojson_write_type type{geojson_write_all};
int layer_idx = 0;
std::string layer_name{};
if (layer_id.IsString())
{
layer_name = layer_id.As<Napi::String>();
if (layer_name == "__array__")
{
type = geojson_write_array;
}
else if (layer_name == "__all__")
{
type = geojson_write_all;
}
else
{
if (!tile_->has_layer(layer_name))
{
std::string error_msg("The layer does not contain the name: " + layer_name);
Napi::TypeError::New(env, error_msg.c_str()).ThrowAsJavaScriptException();
return env.Undefined();
}
type = geojson_write_layer_name;
}
}
else if (layer_id.IsNumber())
{
layer_idx = layer_id.As<Napi::Number>().Int32Value();
if (layer_idx < 0)
{
Napi::TypeError::New(env, "A layer index can not be negative").ThrowAsJavaScriptException();
return env.Undefined();
}
else if (layer_idx >= static_cast<int>(tile_->get_layers().size()))
{
Napi::TypeError::New(env, "Layer index exceeds the number of layers in the vector tile.").ThrowAsJavaScriptException();
return env.Undefined();
}
type = geojson_write_layer_index;
}
Napi::Value callback = info[info.Length() - 1];
auto* worker = new AsyncToGeoJSON(tile_, type, layer_idx, layer_name, callback.As<Napi::Function>());
worker->Queue();
return env.Undefined();
}
/**
* Add features to this tile from a GeoJSON string. GeoJSON coordinates must be in the WGS84 longitude & latitude CRS
* as specified in the [GeoJSON Specification](https://www.rfc-editor.org/rfc/rfc7946.txt).
*
* @memberof VectorTile
* @instance
* @name addGeoJSON
* @param {string} geojson as a string
* @param {string} name of the layer to be added
* @param {Object} [options]
* @param {number} [options.area_threshold=0.1] used to discard small polygons.
* If a value is greater than `0` it will trigger polygons with an area smaller
* than the value to be discarded. Measured in grid integers, not spherical mercator
* coordinates.
* @param {number} [options.simplify_distance=0.0] Simplification works to generalize
* geometries before encoding into vector tiles.simplification distance The
* `simplify_distance` value works in integer space over a 4096 pixel grid and uses
* the [Douglas-Peucker algorithm](https://en.wikipedia.org/wiki/Ramer%E2%80%93Douglas%E2%80%93Peucker_algorithm).
* @param {boolean} [options.strictly_simple=true] ensure all geometry is valid according to
* OGC Simple definition
* @param {boolean} [options.multi_polygon_union=false] union all multipolygons
* @param {Object<mapnik.polygonFillType>} [options.fill_type=mapnik.polygonFillType.positive]
* the fill type used in determining what are holes and what are outer rings. See the
* [Clipper documentation](http://www.angusj.com/delphi/clipper/documentation/Docs/Units/ClipperLib/Types/PolyFillType.htm)
* to learn more about fill types.
* @param {boolean} [options.process_all_rings=false] if `true`, don't assume winding order and ring order of
* polygons are correct according to the [`2.0` Mapbox Vector Tile specification](https://github.com/mapbox/vector-tile-spec)
* @example
* var geojson = { ... };
* var vt = mapnik.VectorTile(0,0,0);
* vt.addGeoJSON(JSON.stringify(geojson), 'layer-name', {});
*/
Napi::Value VectorTile::addGeoJSON(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
if (info.Length() < 1 || !info[0].IsString())
{
Napi::Error::New(env, "first argument must be a GeoJSON string").ThrowAsJavaScriptException();
return env.Undefined();
}
if (info.Length() < 2 || !info[1].IsString())
{
Napi::Error::New(env, "second argument must be a layer name (string)").ThrowAsJavaScriptException();
return env.Undefined();
}
std::string geojson_string = info[0].As<Napi::String>();
std::string geojson_name = info[1].As<Napi::String>();
Napi::Object options = Napi::Object::New(env);
double area_threshold = 0.1;