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#pragma once
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/value.hpp>
#include <mbgl/style/expression/is_constant.hpp>
#include <mbgl/style/expression/interpolate.hpp>
#include <mbgl/style/expression/step.hpp>
#include <mbgl/style/expression/find_zoom_curve.hpp>
#include <mbgl/util/range.hpp>
namespace mbgl {
namespace style {
template <class T>
class CameraFunction {
public:
// The second parameter should be used only for conversions from legacy functions.
CameraFunction(std::unique_ptr<expression::Expression> expression_, bool isExpression_ = true)
: isExpression(isExpression_),
expression(std::move(expression_)),
zoomCurve(expression::findZoomCurveChecked(expression.get())) {
assert(!expression::isZoomConstant(*expression));
assert(expression::isFeatureConstant(*expression));
}
T evaluate(float zoom) const {
const expression::EvaluationResult result = expression->evaluate(expression::EvaluationContext(zoom, nullptr));
if (result) {
const optional<T> typed = expression::fromExpressionValue<T>(*result);
return typed ? *typed : T();
}
return T();
}
float interpolationFactor(const Range<float>& inputLevels, const float inputValue) const {
return zoomCurve.match(
[&](const expression::Interpolate* z) {
return z->interpolationFactor(Range<double> { inputLevels.min, inputLevels.max }, inputValue);
},
[&](const expression::Step*) { return 0.0f; }
);
}
Range<float> getCoveringStops(const float lower, const float upper) const {
return zoomCurve.match(
[&](auto z) { return z->getCoveringStops(lower, upper); }
);
}
std::vector<optional<T>> possibleOutputs() const {
return expression::fromExpressionValues<T>(expression->possibleOutputs());
}
friend bool operator==(const CameraFunction& lhs,
const CameraFunction& rhs) {
return *lhs.expression == *rhs.expression;
}
bool useIntegerZoom = false;
bool isExpression;
const expression::Expression& getExpression() const { return *expression; }
private:
std::shared_ptr<const expression::Expression> expression;
const variant<const expression::Interpolate*, const expression::Step*> zoomCurve;
};
} // namespace style
} // namespace mbgl
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