1 files changed, 26 insertions, 0 deletions
diff --git a/src/mbgl/util/transition.cpp b/src/mbgl/util/transition.cpp
new file mode 100644
index 0000000000..e63a5c311f
--- /dev/null
+++ b/src/mbgl/util/transition.cpp
@@ -0,0 +1,26 @@
+#include <mbgl/util/transition.hpp>
+#include <mbgl/util/unitbezier.hpp>
+#include <mbgl/util/interpolate.hpp>
+#include <mbgl/platform/platform.hpp>
+
+namespace mbgl { namespace util {
+
+UnitBezier ease(0, 0, 0.25, 1);
+
+transition::~transition() {}
+
+template <typename T>
+transition::state ease_transition<T>::update(timestamp now) const {
+    float t = progress(now);
+    if (t >= 1) {
+        value = to;
+        return complete;
+    } else {
+        value = interpolate(from, to, ease.solve(t, 0.001));
+        return running;
+    }
+}
+
+template class ease_transition<double>;
+
+}}