87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
#pragma once
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#include <mbgl/style/expression/expression.hpp>
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#include <mbgl/style/expression/interpolate.hpp>
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#include <mbgl/style/expression/step.hpp>
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#include <mbgl/style/expression/find_zoom_curve.hpp>
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#include <mbgl/style/expression/value.hpp>
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#include <mbgl/style/expression/is_constant.hpp>
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#include <mbgl/style/function/convert.hpp>
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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/util/interpolate.hpp>
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#include <mbgl/util/variant.hpp>
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namespace mbgl {
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namespace style {
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template <class T>
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class CameraFunction {
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public:
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using Stops = std::conditional_t<
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util::Interpolatable<T>::value,
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variant<
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ExponentialStops<T>,
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IntervalStops<T>>,
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variant<
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IntervalStops<T>>>;
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CameraFunction(std::unique_ptr<expression::Expression> expression_)
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: expression(std::move(expression_)),
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zoomCurve(expression::findZoomCurveChecked(expression.get()))
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{
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assert(!expression::isZoomConstant(*expression));
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assert(expression::isFeatureConstant(*expression));
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}
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CameraFunction(Stops stops_)
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: stops(std::move(stops_)),
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expression(stops.match([&] (const auto& s) {
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return expression::Convert::toExpression(s);
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})),
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zoomCurve(expression::findZoomCurveChecked(expression.get()))
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{}
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T evaluate(float zoom) const {
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const expression::EvaluationResult result = expression->evaluate(expression::EvaluationContext(zoom, nullptr));
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if (result) {
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const optional<T> typed = expression::fromExpressionValue<T>(*result);
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return typed ? *typed : T();
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}
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return T();
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}
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float interpolationFactor(const Range<float>& inputLevels, const float inputValue) const {
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return zoomCurve.match(
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[&](const expression::InterpolateBase* z) {
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return z->interpolationFactor(Range<double> { inputLevels.min, inputLevels.max }, inputValue);
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},
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[&](const expression::Step*) { return 0.0f; }
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);
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}
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Range<float> getCoveringStops(const float lower, const float upper) const {
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return zoomCurve.match(
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[&](auto z) { return z->getCoveringStops(lower, upper); }
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);
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}
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friend bool operator==(const CameraFunction& lhs,
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const CameraFunction& rhs) {
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return *lhs.expression == *rhs.expression;
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}
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bool useIntegerZoom = false;
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// retained for compatibility with pre-expression function API
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Stops stops;
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private:
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std::shared_ptr<expression::Expression> expression;
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const variant<const expression::InterpolateBase*, const expression::Step*> zoomCurve;
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};
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} // namespace style
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} // namespace mbgl
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