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#pragma once
#include <mbgl/util/interpolate.hpp>
#include <mbgl/util/range.hpp>
#include <mbgl/util/unitbezier.hpp>
namespace mbgl {
namespace style {
namespace expression {
class ExponentialInterpolator {
public:
ExponentialInterpolator(double base_) : base(base_) {}
double base;
double interpolationFactor(const Range<double>& inputLevels, const double input) const {
return util::interpolationFactor(base,
Range<float> {
static_cast<float>(inputLevels.min),
static_cast<float>(inputLevels.max)
},
input);
}
bool operator==(const ExponentialInterpolator& rhs) const {
return base == rhs.base;
}
};
class CubicBezierInterpolator {
public:
CubicBezierInterpolator(double x1_, double y1_, double x2_, double y2_) : ub(x1_, y1_, x2_, y2_) {}
double interpolationFactor(const Range<double>& inputLevels, const double input) const {
return ub.solve(util::interpolationFactor(1.0,
Range<float> {
static_cast<float>(inputLevels.min),
static_cast<float>(inputLevels.max)
},
input),
1e-6);
}
bool operator==(const CubicBezierInterpolator& rhs) const {
return ub == rhs.ub;
}
util::UnitBezier ub;
};
using Interpolator = variant<ExponentialInterpolator, CubicBezierInterpolator>;
} // namespace expression
} // namespace style
} // namespace mbgl
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