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#include <mbgl/style/piecewisefunction_properties.hpp>
#include <mbgl/style/types.hpp>
#include <cmath>
namespace mbgl {
template <typename T>
size_t getBiggestStopLessThan(std::vector<std::pair<float, T>> stops, float z) {
for (uint32_t i = 0; i < stops.size(); i++) {
if (stops[i].first > z) {
return i == 0 ? i : i - 1;
}
}
return stops.size() - 1;
}
template <typename T>
T PiecewiseConstantFunction<T>::evaluate(float z, const ZoomHistory &zh) const {
T result;
float fraction = std::fmod(z, 1.0f);
float t = std::min((Clock::now() - zh.lastIntegerZoomTime) / duration, 1.0f);
float fromScale = 1.0f;
float toScale = 1.0f;
size_t from, to;
if (z > zh.lastIntegerZoom) {
result.t = fraction + (1.0f - fraction) * t;
from = getBiggestStopLessThan(values, z - 1.0f);
to = getBiggestStopLessThan(values, z);
fromScale *= 2.0f;
} else {
result.t = 1 - (1 - t) * fraction;
to = getBiggestStopLessThan(values, z);
from = getBiggestStopLessThan(values, z + 1.0f);
fromScale /= 2.0f;
}
result.from = values[from].second.to;
result.to = values[to].second.to;
result.fromScale = fromScale;
result.toScale = toScale;
return result;
}
template Faded<std::string> PiecewiseConstantFunction<Faded<std::string>>::evaluate(float z, const ZoomHistory &zoomHistory) const;
template Faded<std::vector<float>> PiecewiseConstantFunction<Faded<std::vector<float>>>::evaluate(float z, const ZoomHistory &zoomHistory) const;
}
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