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author | Lauren Budorick <lauren@mapbox.com> | 2018-02-13 17:49:37 -0800 |
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committer | Lauren Budorick <lauren@mapbox.com> | 2018-02-14 17:32:09 -0800 |
commit | 314c241ab965d9534af5d0645eb6b3557af3e9cc (patch) | |
tree | 200e73cc4854c9fd295145bed7154f09077eb295 /include/mbgl/style/color_ramp_property_value.hpp | |
parent | b2c7becf19533ee186fab85ad1ce10aabfcb55ff (diff) | |
download | qtlocation-mapboxgl-upstream/gradient-base_heatmap.tar.gz |
Implement line-gradientupstream/gradient-base_heatmap
Diffstat (limited to 'include/mbgl/style/color_ramp_property_value.hpp')
-rw-r--r-- | include/mbgl/style/color_ramp_property_value.hpp | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/mbgl/style/color_ramp_property_value.hpp b/include/mbgl/style/color_ramp_property_value.hpp new file mode 100644 index 0000000000..03d74fae0c --- /dev/null +++ b/include/mbgl/style/color_ramp_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 ColorRampPropertyValue { +private: + std::shared_ptr<expression::Expression> value; + + friend bool operator==(const ColorRampPropertyValue& lhs, const ColorRampPropertyValue& rhs) { + return (lhs.isUndefined() && rhs.isUndefined()) || (lhs.value && rhs.value && *(lhs.value) == *(rhs.value)); + } + + friend bool operator!=(const ColorRampPropertyValue& lhs, const ColorRampPropertyValue& rhs) { + return !(lhs == rhs); + } + +public: + ColorRampPropertyValue() : value(nullptr) {} + ColorRampPropertyValue(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 rampEvaluationParameter) const { + const auto result = value->evaluate(expression::EvaluationContext({}, nullptr, {rampEvaluationParameter})); + return *expression::fromExpressionValue<Color>(*result); + } + + bool isDataDriven() const { return false; } + bool hasDataDrivenPropertyDifference(const ColorRampPropertyValue&) const { return false; } + + const expression::Expression& getExpression() const { return *value; } +}; + + +} // namespace style +} // namespace mbgl |