blob: 888a806b5b844d9b4ee0f3ace319e4eef464673b (
plain)
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
|
#include <mbgl/annotation/point_annotation_impl.hpp>
#include <mbgl/annotation/annotation_tile.hpp>
#include <mbgl/math/clamp.hpp>
namespace mbgl {
PointAnnotationImpl::PointAnnotationImpl(const AnnotationID id_, const PointAnnotation& point_)
: id(id_),
point(point_) {
}
void PointAnnotationImpl::updateLayer(const TileID& tileID, AnnotationTileLayer& layer) const {
std::unordered_map<std::string, std::string> featureProperties;
featureProperties.emplace("sprite", point.icon.empty() ? std::string("default_marker") : point.icon);
// Clamp to the latitude limits of Web Mercator.
const double constrainedLatitude = util::clamp(point.position.latitude, -util::LATITUDE_MAX, util::LATITUDE_MAX);
// Project a coordinate into unit space in a square map.
const double sine = std::sin(constrainedLatitude * util::DEG2RAD);
const double x = point.position.longitude / util::DEGREES_MAX + 0.5;
const double y = 0.5 - 0.25 * std::log((1.0 + sine) / (1.0 - sine)) / M_PI;
Point<double> projected(x, y);
projected *= std::pow(2, tileID.z);
projected.x = std::fmod(projected.x, 1);
projected.y = std::fmod(projected.y, 1);
projected *= double(GeometryTileFeature::defaultExtent);
layer.features.emplace_back(
std::make_shared<const AnnotationTileFeature>(FeatureType::Point,
GeometryCollection {{ {{ convertPoint<int16_t>(projected) }} }},
featureProperties));
}
} // namespace mbgl
|
