127 lines
4.4 KiB
C++
127 lines
4.4 KiB
C++
#pragma once
|
|
|
|
#include <mbgl/style/expression/expression.hpp>
|
|
#include <mbgl/style/expression/interpolate.hpp>
|
|
#include <mbgl/style/expression/step.hpp>
|
|
#include <mbgl/style/expression/find_zoom_curve.hpp>
|
|
#include <mbgl/style/expression/value.hpp>
|
|
#include <mbgl/style/expression/is_constant.hpp>
|
|
#include <mbgl/style/function/convert.hpp>
|
|
#include <mbgl/style/function/composite_exponential_stops.hpp>
|
|
#include <mbgl/style/function/composite_interval_stops.hpp>
|
|
#include <mbgl/style/function/composite_categorical_stops.hpp>
|
|
#include <mbgl/util/interpolate.hpp>
|
|
#include <mbgl/util/range.hpp>
|
|
#include <mbgl/util/variant.hpp>
|
|
|
|
#include <string>
|
|
#include <tuple>
|
|
|
|
namespace mbgl {
|
|
|
|
class GeometryTileFeature;
|
|
|
|
namespace style {
|
|
|
|
// A CompositeFunction consists of an outer zoom function whose stop range values are
|
|
// "inner" source functions. It provides the GL Native implementation of
|
|
// "zoom-and-property" functions from the style spec.
|
|
|
|
template <class T>
|
|
class CompositeFunction {
|
|
public:
|
|
using InnerStops = std::conditional_t<
|
|
util::Interpolatable<T>::value,
|
|
variant<
|
|
ExponentialStops<T>,
|
|
IntervalStops<T>,
|
|
CategoricalStops<T>>,
|
|
variant<
|
|
IntervalStops<T>,
|
|
CategoricalStops<T>>>;
|
|
|
|
using Stops = std::conditional_t<
|
|
util::Interpolatable<T>::value,
|
|
variant<
|
|
CompositeExponentialStops<T>,
|
|
CompositeIntervalStops<T>,
|
|
CompositeCategoricalStops<T>>,
|
|
variant<
|
|
CompositeIntervalStops<T>,
|
|
CompositeCategoricalStops<T>>>;
|
|
|
|
CompositeFunction(std::unique_ptr<expression::Expression> expression_)
|
|
: isExpression(true),
|
|
expression(std::move(expression_)),
|
|
zoomCurve(expression::findZoomCurveChecked(expression.get()))
|
|
{
|
|
assert(!expression::isZoomConstant(*expression));
|
|
assert(!expression::isFeatureConstant(*expression));
|
|
}
|
|
|
|
CompositeFunction(const std::string& property, const Stops& stops, optional<T> defaultValue_ = {})
|
|
: isExpression(false),
|
|
defaultValue(std::move(defaultValue_)),
|
|
expression(stops.match([&] (const auto& s) {
|
|
return expression::Convert::toExpression(property, s);
|
|
})),
|
|
zoomCurve(expression::findZoomCurveChecked(expression.get()))
|
|
{}
|
|
|
|
// Return the range obtained by evaluating the function at each of the zoom levels in zoomRange
|
|
template <class Feature>
|
|
Range<T> evaluate(const Range<float>& zoomRange, const Feature& feature, T finalDefaultValue) {
|
|
return Range<T> {
|
|
evaluate(zoomRange.min, feature, finalDefaultValue),
|
|
evaluate(zoomRange.max, feature, finalDefaultValue)
|
|
};
|
|
}
|
|
|
|
template <class Feature>
|
|
T evaluate(float zoom, const Feature& feature, T finalDefaultValue) const {
|
|
const expression::EvaluationResult result = expression->evaluate(expression::EvaluationContext({zoom}, &feature));
|
|
if (result) {
|
|
const optional<T> typed = expression::fromExpressionValue<T>(*result);
|
|
return typed ? *typed : defaultValue ? *defaultValue : finalDefaultValue;
|
|
}
|
|
return defaultValue ? *defaultValue : finalDefaultValue;
|
|
}
|
|
|
|
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 CompositeFunction& lhs,
|
|
const CompositeFunction& rhs) {
|
|
return *lhs.expression == *rhs.expression;
|
|
}
|
|
|
|
const expression::Expression& getExpression() const { return *expression; }
|
|
|
|
bool useIntegerZoom = false;
|
|
bool isExpression;
|
|
|
|
private:
|
|
optional<T> defaultValue;
|
|
std::shared_ptr<expression::Expression> expression;
|
|
const variant<const expression::Interpolate*, const expression::Step*> zoomCurve;
|
|
};
|
|
|
|
} // namespace style
|
|
} // namespace mbgl
|