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#pragma once
#include <mbgl/style/property_value.hpp>
#include <mbgl/util/interpolate.hpp>
namespace mbgl {
namespace style {
class CalculationParameters;
template <typename T>
class PropertyEvaluator {
public:
using ResultType = T;
PropertyEvaluator(const CalculationParameters& parameters_, T defaultValue_)
: parameters(parameters_),
defaultValue(std::move(defaultValue_)) {}
T operator()(const Undefined&) const { return defaultValue; }
T operator()(const T& constant) const { return constant; }
T operator()(const Function<T>&) const;
private:
const CalculationParameters& parameters;
T defaultValue;
};
template <typename T>
struct Faded {
T from;
T to;
float fromScale;
float toScale;
float t;
};
template <typename T>
class CrossFadedPropertyEvaluator {
public:
using ResultType = Faded<T>;
CrossFadedPropertyEvaluator(const CalculationParameters& parameters_, T defaultValue_)
: parameters(parameters_),
defaultValue(std::move(defaultValue_)) {}
Faded<T> operator()(const Undefined&) const;
Faded<T> operator()(const T& constant) const;
Faded<T> operator()(const Function<T>&) const;
private:
Faded<T> calculate(const T& min, const T& mid, const T& max) const;
const CalculationParameters& parameters;
T defaultValue;
};
} // namespace style
namespace util {
template <typename T>
struct Interpolator<style::Faded<T>>
: Uninterpolated {};
} // namespace util
} // namespace mbgl
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