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#include <mbgl/geometry/feature_index.hpp>
#include <mbgl/style/style.hpp>
#include <mbgl/style/layer.hpp>
#include <mbgl/style/layer_impl.hpp>
#include <mbgl/style/layers/symbol_layer.hpp>
#include <mbgl/text/collision_tile.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/math.hpp>
#include <mbgl/math/minmax.hpp>
#include <mbgl/map/query.hpp>
#include <mbgl/style/filter.hpp>
#include <mbgl/style/filter_evaluator.hpp>
#include <mapbox/geometry/envelope.hpp>
#include <cassert>
#include <string>
namespace mbgl {
FeatureIndex::FeatureIndex()
: grid(util::EXTENT, 16, 0) {
}
void FeatureIndex::insert(const GeometryCollection& geometries,
std::size_t index,
const std::string& sourceLayerName,
const std::string& bucketName) {
for (const auto& ring : geometries) {
grid.insert(IndexedSubfeature { index, sourceLayerName, bucketName, sortIndex++ },
mapbox::geometry::envelope(ring));
}
}
static bool vectorContains(const std::vector<std::string>& vector, const std::string& s) {
return std::find(vector.begin(), vector.end(), s) != vector.end();
}
static bool vectorsIntersect(const std::vector<std::string>& vectorA, const std::vector<std::string>& vectorB) {
for (const auto& a : vectorA) {
if (vectorContains(vectorB, a)) {
return true;
}
}
return false;
}
static bool topDown(const IndexedSubfeature& a, const IndexedSubfeature& b) {
return a.sortIndex > b.sortIndex;
}
static bool topDownSymbols(const IndexedSubfeature& a, const IndexedSubfeature& b) {
return a.sortIndex < b.sortIndex;
}
void FeatureIndex::query(
std::unordered_map<std::string, std::vector<Feature>>& result,
const GeometryCoordinates& queryGeometry,
const float bearing,
const double tileSize,
const double scale,
const QueryOptions& queryOptions,
const GeometryTileData& geometryTileData,
const CanonicalTileID& tileID,
const style::Style& style,
const CollisionTile* collisionTile) const {
mapbox::geometry::box<int16_t> box = mapbox::geometry::envelope(queryGeometry);
const float pixelsToTileUnits = util::EXTENT / tileSize / scale;
const int16_t additionalRadius = std::min<int16_t>(util::EXTENT, std::ceil(style.getQueryRadius() * pixelsToTileUnits));
std::vector<IndexedSubfeature> features = grid.query({ box.min - additionalRadius, box.max + additionalRadius });
std::sort(features.begin(), features.end(), topDown);
size_t previousSortIndex = std::numeric_limits<size_t>::max();
for (const auto& indexedFeature : features) {
// If this feature is the same as the previous feature, skip it.
if (indexedFeature.sortIndex == previousSortIndex) continue;
previousSortIndex = indexedFeature.sortIndex;
addFeature(result, indexedFeature, queryGeometry, queryOptions, geometryTileData, tileID, style, bearing, pixelsToTileUnits);
}
// Query symbol features, if they've been placed.
if (!collisionTile) {
return;
}
std::vector<IndexedSubfeature> symbolFeatures = collisionTile->queryRenderedSymbols(queryGeometry, scale);
std::sort(symbolFeatures.begin(), symbolFeatures.end(), topDownSymbols);
for (const auto& symbolFeature : symbolFeatures) {
addFeature(result, symbolFeature, queryGeometry, queryOptions, geometryTileData, tileID, style, bearing, pixelsToTileUnits);
}
}
void FeatureIndex::addFeature(
std::unordered_map<std::string, std::vector<Feature>>& result,
const IndexedSubfeature& indexedFeature,
const GeometryCoordinates& queryGeometry,
const QueryOptions& options,
const GeometryTileData& geometryTileData,
const CanonicalTileID& tileID,
const style::Style& style,
const float bearing,
const float pixelsToTileUnits) const {
auto& layerIDs = bucketLayerIDs.at(indexedFeature.bucketName);
if (options.layerIDs && !vectorsIntersect(layerIDs, *options.layerIDs)) {
return;
}
auto sourceLayer = geometryTileData.getLayer(indexedFeature.sourceLayerName);
assert(sourceLayer);
auto geometryTileFeature = sourceLayer->getFeature(indexedFeature.index);
assert(geometryTileFeature);
for (const auto& layerID : layerIDs) {
if (options.layerIDs && !vectorContains(*options.layerIDs, layerID)) {
continue;
}
auto styleLayer = style.getLayer(layerID);
if (!styleLayer ||
(!styleLayer->is<style::SymbolLayer>() &&
!styleLayer->baseImpl->queryIntersectsGeometry(queryGeometry, geometryTileFeature->getGeometries(), bearing, pixelsToTileUnits))) {
continue;
}
if (options.filter && !(*options.filter)(*geometryTileFeature)) {
continue;
}
result[layerID].push_back(convertFeature(*geometryTileFeature, tileID));
}
}
optional<GeometryCoordinates> FeatureIndex::translateQueryGeometry(
const GeometryCoordinates& queryGeometry,
const std::array<float, 2>& translate,
const style::TranslateAnchorType anchorType,
const float bearing,
const float pixelsToTileUnits) {
if (translate[0] == 0 && translate[1] == 0) {
return {};
}
GeometryCoordinate translateVec(translate[0] * pixelsToTileUnits, translate[1] * pixelsToTileUnits);
if (anchorType == style::TranslateAnchorType::Viewport) {
translateVec = util::rotate(translateVec, -bearing);
}
GeometryCoordinates translated;
for (const auto& p : queryGeometry) {
translated.push_back(p - translateVec);
}
return translated;
}
void FeatureIndex::setBucketLayerIDs(const std::string& bucketName, const std::vector<std::string>& layerIDs) {
bucketLayerIDs[bucketName] = layerIDs;
}
} // namespace mbgl
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