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#include <mbgl/style/property_evaluator.hpp>
#include <mbgl/style/calculation_parameters.hpp>
#include <mbgl/style/types.hpp>
#include <mbgl/util/interpolate.hpp>
#include <mbgl/util/chrono.hpp>
#include <mbgl/util/color.hpp>
#include <cmath>
namespace mbgl {
namespace style {
template <typename T>
inline T defaultStopsValue();
template <> inline bool defaultStopsValue() { return true; }
template <> inline float defaultStopsValue() { return 1.0f; }
template <> inline Color defaultStopsValue() { return {{ 0, 0, 0, 1 }}; }
template <> inline std::vector<float> defaultStopsValue() { return {{ 1, 0 }}; }
template <> inline std::vector<std::string> defaultStopsValue() { return {{}}; }
template <> inline std::array<float, 2> defaultStopsValue() { return {{ 0, 0 }}; }
template <> inline std::string defaultStopsValue() { return {}; }
template <> inline TranslateAnchorType defaultStopsValue() { return {}; }
template <> inline RotateAnchorType defaultStopsValue() { return {}; }
template <> inline LineCapType defaultStopsValue() { return {}; }
template <> inline LineJoinType defaultStopsValue() { return {}; }
template <> inline SymbolPlacementType defaultStopsValue() { return {}; }
template <> inline TextAnchorType defaultStopsValue() { return {}; }
template <> inline TextJustifyType defaultStopsValue() { return {}; }
template <> inline TextTransformType defaultStopsValue() { return {}; }
template <> inline AlignmentType defaultStopsValue() { return {}; }
template <typename T>
T PropertyEvaluator<T>::operator()(const Function<T>& fn) const {
float base = fn.getBase();
const std::vector<std::pair<float, T>>& stops = fn.getStops();
float z = parameters.z;
bool smaller = false;
float smaller_z = 0.0f;
T smaller_val = T();
bool larger = false;
float larger_z = 0.0f;
T larger_val = T();
for (uint32_t i = 0; i < stops.size(); i++) {
float stop_z = stops[i].first;
T stop_val = stops[i].second;
if (stop_z <= z && (!smaller || smaller_z < stop_z)) {
smaller = true;
smaller_z = stop_z;
smaller_val = stop_val;
}
if (stop_z >= z && (!larger || larger_z > stop_z)) {
larger = true;
larger_z = stop_z;
larger_val = stop_val;
}
}
if (smaller && larger) {
if (larger_z == smaller_z || larger_val == smaller_val) {
return smaller_val;
}
const float zoomDiff = larger_z - smaller_z;
const float zoomProgress = z - smaller_z;
if (base == 1.0f) {
const float t = zoomProgress / zoomDiff;
return util::interpolate(smaller_val, larger_val, t);
} else {
const float t = (std::pow(base, zoomProgress) - 1) / (std::pow(base, zoomDiff) - 1);
return util::interpolate(smaller_val, larger_val, t);
}
} else if (larger) {
return larger_val;
} else if (smaller) {
return smaller_val;
} else {
// No stop defined.
return defaultStopsValue<T>();
}
}
template class PropertyEvaluator<bool>;
template class PropertyEvaluator<float>;
template class PropertyEvaluator<Color>;
template class PropertyEvaluator<std::vector<float>>;
template class PropertyEvaluator<std::vector<std::string>>;
template class PropertyEvaluator<std::array<float, 2>>;
template class PropertyEvaluator<std::string>;
template class PropertyEvaluator<TranslateAnchorType>;
template class PropertyEvaluator<RotateAnchorType>;
template class PropertyEvaluator<LineCapType>;
template class PropertyEvaluator<LineJoinType>;
template class PropertyEvaluator<SymbolPlacementType>;
template class PropertyEvaluator<TextAnchorType>;
template class PropertyEvaluator<TextJustifyType>;
template class PropertyEvaluator<TextTransformType>;
template class PropertyEvaluator<AlignmentType>;
template <typename T>
Faded<T> CrossFadedPropertyEvaluator<T>::operator()(const Undefined&) const {
return calculate(defaultValue, defaultValue, defaultValue);
}
template <typename T>
Faded<T> CrossFadedPropertyEvaluator<T>::operator()(const T& constant) const {
return calculate(constant, constant, constant);
}
template <typename T>
inline T getBiggestStopLessThan(const Function<T>& function, float z) {
const auto& stops = function.getStops();
for (uint32_t i = 0; i < stops.size(); i++) {
if (stops[i].first > z) {
return stops[i == 0 ? i : i - 1].second;
}
}
return stops.at(stops.size() - 1).second;
}
template <typename T>
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));
}
template <typename T>
Faded<T> CrossFadedPropertyEvaluator<T>::calculate(const T& min, const T& mid, const T& max) const {
const float z = parameters.z;
const float fraction = z - std::floor(z);
const std::chrono::duration<float> d = parameters.defaultFadeDuration;
const float t = std::min((parameters.now - parameters.zoomHistory.lastIntegerZoomTime) / d, 1.0f);
return z > parameters.zoomHistory.lastIntegerZoom
? Faded<T> { min, mid, 2.0f, 1.0f, fraction + (1.0f - fraction) * t }
: Faded<T> { max, mid, 0.5f, 1.0f, 1 - (1 - t) * fraction };
}
template class CrossFadedPropertyEvaluator<std::string>;
template class CrossFadedPropertyEvaluator<std::vector<float>>;
} // namespace style
} // namespace mbgl
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