102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
#pragma once
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#include <mbgl/util/color.hpp>
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#include <mbgl/util/range.hpp>
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#include <mbgl/style/position.hpp>
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#include <array>
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#include <vector>
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#include <string>
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#include <type_traits>
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#include <utility>
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namespace mbgl {
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namespace util {
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float interpolationFactor(float base, Range<float> range, float z);
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template <class T, class Enabled = void>
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struct Interpolator;
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template <typename T>
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T interpolate(const T& a, const T& b, const double t) {
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return Interpolator<T>()(a, b, t);
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}
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template <class T, class Enabled>
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struct Interpolator {
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T operator()(const T& a, const T& b, const double t) const {
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return a * (1.0 - t) + b * t;
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}
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};
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template <class T, std::size_t N>
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struct Interpolator<std::array<T, N>> {
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private:
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using Array = std::array<T, N>;
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template <std::size_t... I>
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Array operator()(const Array& a, const Array& b, const double t, std::index_sequence<I...>) {
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return {{ interpolate(a[I], b[I], t)... }};
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}
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public:
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Array operator()(const Array& a, const Array& b, const double t) {
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return operator()(a, b, t, std::make_index_sequence<N>());
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}
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};
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template <>
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struct Interpolator<style::Position> {
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public:
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style::Position operator()(const style::Position& a, const style::Position& b, const double t) {
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auto pos = style::Position();
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auto interpolated = interpolate(a.getCartesian(), b.getCartesian(), t);
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pos.setCartesian(interpolated);
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return { pos };
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}
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};
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template <>
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struct Interpolator<Color> {
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public:
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Color operator()(const Color& a, const Color& b, const double t) {
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return {
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interpolate(a.r, b.r, t),
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interpolate(a.g, b.g, t),
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interpolate(a.b, b.b, t),
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interpolate(a.a, b.a, t)
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};
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}
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};
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struct Uninterpolated {
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template <class T>
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T operator()(const T& a, const T&, const double) const {
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return a;
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}
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};
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template <>
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struct Interpolator<bool>
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: Uninterpolated {};
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template <class T>
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struct Interpolator<T, typename std::enable_if_t<std::is_enum<T>::value>>
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: Uninterpolated {};
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template <>
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struct Interpolator<std::string>
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: Uninterpolated {};
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template <class T>
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struct Interpolator<std::vector<T>>
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: Uninterpolated {};
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template <class T>
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constexpr bool Interpolatable = !std::is_base_of<Uninterpolated, Interpolator<T>>::value;
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} // namespace util
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} // namespace mbgl
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