| 1 | #pragma once |
| 2 | |
| 3 | #include <mbgl/util/interpolate.hpp> |
| 4 | #include <mbgl/util/range.hpp> |
| 5 | #include <mbgl/util/unitbezier.hpp> |
| 6 | |
| 7 | namespace mbgl { |
| 8 | namespace style { |
| 9 | namespace expression { |
| 10 | |
| 11 | class ExponentialInterpolator { |
| 12 | public: |
| 13 | ExponentialInterpolator(double base_) : base(base_) {} |
| 14 | |
| 15 | double base; |
| 16 | |
| 17 | double interpolationFactor(const Range<double>& inputLevels, const double input) const { |
| 18 | return util::interpolationFactor(base, |
| 19 | range: Range<float> { |
| 20 | static_cast<float>(inputLevels.min), |
| 21 | static_cast<float>(inputLevels.max) |
| 22 | }, |
| 23 | z: input); |
| 24 | } |
| 25 | |
| 26 | bool operator==(const ExponentialInterpolator& rhs) const { |
| 27 | return base == rhs.base; |
| 28 | } |
| 29 | }; |
| 30 | |
| 31 | class CubicBezierInterpolator { |
| 32 | public: |
| 33 | CubicBezierInterpolator(double x1_, double y1_, double x2_, double y2_) : ub(x1_, y1_, x2_, y2_) {} |
| 34 | |
| 35 | double interpolationFactor(const Range<double>& inputLevels, const double input) const { |
| 36 | return ub.solve(x: input / (inputLevels.max - inputLevels.min), epsilon: 1e-6); |
| 37 | } |
| 38 | |
| 39 | bool operator==(const CubicBezierInterpolator& rhs) const { |
| 40 | return ub == rhs.ub; |
| 41 | } |
| 42 | |
| 43 | util::UnitBezier ub; |
| 44 | }; |
| 45 | |
| 46 | using Interpolator = variant<ExponentialInterpolator, CubicBezierInterpolator>; |
| 47 | |
| 48 | } // namespace expression |
| 49 | } // namespace style |
| 50 | } // namespace mbgl |
| 51 | |