[core] Fix SymbolAnnotation coordinate system conversions

1 files changed, 5 insertions, 20 deletions

diff --git a/src/mbgl/annotation/symbol_annotation_impl.cpp b/src/mbgl/annotation/symbol_annotation_impl.cpp
index 040de21214..e5ae5f4b91 100644
--- a/src/mbgl/annotation/symbol_annotation_impl.cpp
+++ b/src/mbgl/annotation/symbol_annotation_impl.cpp
@@ -2,6 +2,7 @@
 #include <mbgl/annotation/annotation_tile.hpp>
 #include <mbgl/tile/tile_id.hpp>
 #include <mbgl/math/clamp.hpp>
+#include <mbgl/util/tile_coordinate.hpp>
 
 namespace mbgl {
 
@@ -14,26 +15,10 @@ void SymbolAnnotationImpl::updateLayer(const CanonicalTileID& tileID, Annotation
     std::unordered_map<std::string, std::string> featureProperties;
     featureProperties.emplace("sprite", annotation.icon.empty() ? std::string("default_marker") : annotation.icon);
 
-    const Point<double>& p = annotation.geometry;
-
-    // Clamp to the latitude limits of Web Mercator.
-    const double constrainedLatitude = util::clamp(p.y, -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 = p.x / 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(util::EXTENT);
-
-    layer.features.emplace_back(id,
-                                FeatureType::Point,
-                                GeometryCollection {{ {{ convertPoint<int16_t>(projected) }} }},
-                                featureProperties);
+    LatLng latLng { annotation.geometry.y, annotation.geometry.x };
+    TileCoordinate coordinate = TileCoordinate::fromLatLng(0, latLng);
+    GeometryCoordinate tilePoint = TileCoordinate::toGeometryCoordinate(UnwrappedTileID(0, tileID), coordinate.p);
+    layer.features.emplace_back(id, FeatureType::Point, GeometryCollection {{ {{ tilePoint }} }}, featureProperties);
 }
 
 } // namespace mbgl