[core] implement queryRenderedFeatures

2 files changed, 21 insertions, 0 deletions

diff --git a/include/mbgl/map/map.hpp b/include/mbgl/map/map.hpp
index 0b1720e65b..41f34c102b 100644
--- a/include/mbgl/map/map.hpp
+++ b/include/mbgl/map/map.hpp
@@ -158,6 +158,10 @@ public:
                         const char* before = nullptr);
     void removeCustomLayer(const std::string& id);
 
+    // Feature queries
+    std::vector<std::string> queryRenderedFeatures(const ScreenCoordinate&, const optional<std::vector<std::string>>& layerIDs = {});
+    std::vector<std::string> queryRenderedFeatures(const std::array<ScreenCoordinate, 2>&, const optional<std::vector<std::string>>& layerIDs = {});
+
     // Memory
     void setSourceTileCacheSize(size_t);
     void onLowMemory();
diff --git a/include/mbgl/util/math.hpp b/include/mbgl/util/math.hpp
index 1e5073ab3b..c0fdea47fb 100644
--- a/include/mbgl/util/math.hpp
+++ b/include/mbgl/util/math.hpp
@@ -88,6 +88,14 @@ inline T dist(const S1& a, const S2& b) {
     return c;
 }
 
+template <typename T, typename S1, typename S2>
+inline T distSqr(const S1& a, const S2& b) {
+    T dx = b.x - a.x;
+    T dy = b.y - a.y;
+    T c = dx * dx + dy * dy;
+    return c;
+}
+
 template <typename T>
 inline T round(const T& a) {
     return T(::round(a.x), ::round(a.y));
@@ -113,6 +121,15 @@ inline S unit(const S& a) {
     return a * (1 / magnitude);
 }
 
+template <typename T, typename S = double>
+inline T rotate(const T& a, S angle) {
+    S cos = std::cos(angle);
+    S sin = std::sin(angle);
+    S x = cos * a.x - sin * a.y;
+    S y = sin * a.x + cos * a.y;
+    return T(x, y);
+}
+
 template <typename T>
 T clamp(T value, T min_, T max_) {
     return max(min_, min(max_, value));