Faded<T> Function<Faded<T>>::evaluate(const StyleCalculationParameters& parameters) const {
Faded<T> result;
float z = parameters.z;
float fraction = std::fmod(z, 1.0f);
std::chrono::duration<float> d = parameters.defaultFadeDuration;
float t = std::min((parameters.now - parameters.zoomHistory.lastIntegerZoomTime) / d, 1.0f);
float fromScale = 1.0f;
float toScale = 1.0f;
size_t from, to;
if (z > parameters.zoomHistory.lastIntegerZoom) {
result.t = fraction + (1.0f - fraction) * t;
from = getBiggestStopLessThan(stops, z - 1.0f);
to = getBiggestStopLessThan(stops, z);
fromScale *= 2.0f;
} else {
result.t = 1 - (1 - t) * fraction;
to = getBiggestStopLessThan(stops, z);
from = getBiggestStopLessThan(stops, z + 1.0f);
fromScale /= 2.0f;
}
result.from = stops[from].second;
result.to = stops[to].second;
result.fromScale = fromScale;
result.toScale = toScale;
return result;
}
Faded<T> CrossFadedPropertyEvaluator<T>::operator()(const Function<T>& function) const {
return calculate(getBiggestStopLessThan(function, parameters.z - 1.0f),
getBiggestStopLessThan(function, parameters.z),
getBiggestStopLessThan(function, parameters.z + 1.0f));
}
