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