57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
#pragma once
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#include <mbgl/style/function/exponential_stops.hpp>
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#include <mbgl/style/function/interval_stops.hpp>
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#include <mbgl/style/function/categorical_stops.hpp>
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#include <mbgl/style/function/identity_stops.hpp>
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#include <mbgl/tile/geometry_tile_data.hpp>
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#include <mbgl/util/interpolate.hpp>
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#include <mbgl/util/variant.hpp>
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#include <string>
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namespace mbgl {
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namespace style {
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template <class T>
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class SourceFunction {
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public:
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using Stops = std::conditional_t<
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util::Interpolatable<T>,
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variant<
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ExponentialStops<T>,
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IntervalStops<T>,
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CategoricalStops<T>,
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IdentityStops<T>>,
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variant<
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IntervalStops<T>,
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CategoricalStops<T>,
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IdentityStops<T>>>;
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SourceFunction(std::string property_, Stops stops_)
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: property(std::move(property_)),
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stops(std::move(stops_)) {
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}
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T evaluate(const GeometryTileFeature& feature) const {
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optional<Value> v = feature.getValue(property);
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if (!v) {
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return T();
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}
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return stops.match([&] (const auto& s) {
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return s.evaluate(*v);
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});
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}
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friend bool operator==(const SourceFunction& lhs,
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const SourceFunction& rhs) {
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return lhs.property == rhs.property && lhs.stops == rhs.stops;
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}
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std::string property;
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Stops stops;
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};
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} // namespace style
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} // namespace mbgl
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