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Diffstat (limited to 'include/mbgl/style/heatmap_color_property_value.hpp')
-rw-r--r-- | include/mbgl/style/heatmap_color_property_value.hpp | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/mbgl/style/heatmap_color_property_value.hpp b/include/mbgl/style/heatmap_color_property_value.hpp new file mode 100644 index 0000000000..130639c6e2 --- /dev/null +++ b/include/mbgl/style/heatmap_color_property_value.hpp @@ -0,0 +1,49 @@ +#pragma once + +#include <mbgl/util/variant.hpp> +#include <mbgl/style/undefined.hpp> +#include <mbgl/style/function/camera_function.hpp> + +namespace mbgl { +namespace style { + +/* + * Special-case implementation of (a subset of) the PropertyValue<T> interface + * used for building the HeatmapColor paint property traits class. + */ +class HeatmapColorPropertyValue { +private: + std::shared_ptr<expression::Expression> value; + + friend bool operator==(const HeatmapColorPropertyValue& lhs, const HeatmapColorPropertyValue& rhs) { + return (lhs.isUndefined() && rhs.isUndefined()) || (lhs.value && rhs.value && *(lhs.value) == *(rhs.value)); + } + + friend bool operator!=(const HeatmapColorPropertyValue& lhs, const HeatmapColorPropertyValue& rhs) { + return !(lhs == rhs); + } + +public: + HeatmapColorPropertyValue() : value(nullptr) {} + HeatmapColorPropertyValue(std::shared_ptr<expression::Expression> value_) : value(std::move(value_)) {} + + bool isUndefined() const { return value.get() == nullptr; } + + // noop, needed for batch evaluation of paint property values to compile + template <typename Evaluator> + Color evaluate(const Evaluator&, TimePoint = {}) const { return {}; } + + Color evaluate(double heatmapDensity) const { + const auto result = value->evaluate(expression::EvaluationContext({}, nullptr, {heatmapDensity})); + return *expression::fromExpressionValue<Color>(*result); + } + + bool isDataDriven() const { return false; } + bool hasDataDrivenPropertyDifference(const HeatmapColorPropertyValue&) const { return false; } + + const expression::Expression& getExpression() const { return *value; } +}; + + +} // namespace style +} // namespace mbgl |