Repo created

libs/drape_frontend/animation/opacity_animation.hpp

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+#pragma once
+
+#include "drape_frontend/animation/base_interpolator.hpp"
+
+namespace df
+{
+class OpacityAnimation : public BaseInterpolator
+{
+  using TBase = BaseInterpolator;
+
+public:
+  OpacityAnimation(double duration, double startOpacity, double endOpacity);
+  OpacityAnimation(double duration, double delay, double startOpacity, double endOpacity);
+
+  void Advance(double elapsedSeconds) override;
+  double GetOpacity() const { return m_opacity; }
+
+private:
+  double m_startOpacity;
+  double m_endOpacity;
+  double m_opacity;
+};
+}  // namespace df