110 lines
3.4 KiB
C++
110 lines
3.4 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/util/interpolate.hpp>
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#include <mbgl/util/range.hpp>
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#include <mbgl/util/variant.hpp>
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#include <string>
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#include <tuple>
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namespace mbgl {
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class GeometryTileFeature;
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namespace style {
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// A CompositeFunction consists of an outer zoom function whose stop range values are
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// "inner" source functions. It provides the GL Native implementation of
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// "zoom-and-property" functions from the style spec.
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template <class T>
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class CompositeFunction {
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public:
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using InnerStops = 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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variant<
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IntervalStops<T>,
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CategoricalStops<T>>>;
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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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std::map<float, ExponentialStops<T>>,
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std::map<float, IntervalStops<T>>,
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std::map<float, CategoricalStops<T>>>,
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variant<
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std::map<float, IntervalStops<T>>,
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std::map<float, CategoricalStops<T>>>>;
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CompositeFunction(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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std::tuple<Range<float>, Range<InnerStops>>
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coveringRanges(float zoom) const {
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return stops.match(
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[&] (const auto& s) {
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assert(!s.empty());
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auto minIt = s.lower_bound(zoom);
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auto maxIt = s.upper_bound(zoom);
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if (minIt != s.begin()) {
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minIt--;
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}
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return std::make_tuple(
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Range<float> {
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minIt == s.end() ? s.rbegin()->first : minIt->first,
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maxIt == s.end() ? s.rbegin()->first : maxIt->first
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},
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Range<InnerStops> {
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minIt == s.end() ? s.rbegin()->second : minIt->second,
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maxIt == s.end() ? s.rbegin()->second : maxIt->second
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}
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);
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}
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);
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}
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Range<T> evaluate(Range<InnerStops> coveringStops,
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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(), T() };
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}
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auto eval = [&] (const auto& s) {
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return s.evaluate(*v);
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};
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return Range<T> {
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coveringStops.min.match(eval),
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coveringStops.max.match(eval)
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};
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}
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T evaluate(float zoom, const GeometryTileFeature& feature) const {
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std::tuple<Range<float>, Range<InnerStops>> ranges = coveringRanges(zoom);
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Range<T> resultRange = evaluate(std::get<1>(ranges), feature);
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return util::interpolate(
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resultRange.min,
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resultRange.max,
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util::interpolationFactor(1.0f, std::get<0>(ranges), zoom));
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}
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friend bool operator==(const CompositeFunction& lhs,
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const CompositeFunction& 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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