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#pragma once
#include <mbgl/util/feature.hpp>
#include <mbgl/util/interpolate.hpp>
#include <map>
namespace mbgl {
namespace style {
template <class T>
class ExponentialStops {
public:
using Stops = std::map<float, T>;
Stops stops;
float base = 1.0f;
ExponentialStops() = default;
ExponentialStops(Stops stops_, float base_ = 1.0f)
: stops(std::move(stops_)),
base(base_) {
}
optional<T> evaluate(float z) const {
if (stops.empty()) {
return {};
}
auto it = stops.upper_bound(z);
if (it == stops.end()) {
return stops.rbegin()->second;
} else if (it == stops.begin()) {
return stops.begin()->second;
} else {
return util::interpolate(std::prev(it)->second, it->second,
util::interpolationFactor(base, { std::prev(it)->first, it->first }, z));
}
}
optional<T> evaluate(const Value& value) const {
optional<float> z = numericValue<float>(value);
if (!z) {
return {};
}
return evaluate(*z);
}
friend bool operator==(const ExponentialStops& lhs,
const ExponentialStops& rhs) {
return lhs.stops == rhs.stops && lhs.base == rhs.base;
}
};
} // namespace style
} // namespace mbgl
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