diff options
Diffstat (limited to 'include/mbgl/style/conversion/color_ramp_property_value.hpp')
-rw-r--r-- | include/mbgl/style/conversion/color_ramp_property_value.hpp | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/mbgl/style/conversion/color_ramp_property_value.hpp b/include/mbgl/style/conversion/color_ramp_property_value.hpp new file mode 100644 index 0000000000..cf5d5e55d9 --- /dev/null +++ b/include/mbgl/style/conversion/color_ramp_property_value.hpp @@ -0,0 +1,49 @@ +#pragma once + +#include <mbgl/style/color_ramp_property_value.hpp> +#include <mbgl/style/conversion.hpp> +#include <mbgl/style/conversion/constant.hpp> +#include <mbgl/style/conversion/function.hpp> +#include <mbgl/style/expression/value.hpp> +#include <mbgl/style/expression/is_constant.hpp> +#include <mbgl/style/expression/is_expression.hpp> +#include <mbgl/style/expression/find_zoom_curve.hpp> +#include <mbgl/style/expression/parsing_context.hpp> + +namespace mbgl { +namespace style { +namespace conversion { + +template <> +struct Converter<ColorRampPropertyValue> { + optional<ColorRampPropertyValue> operator()(const Convertible& value, Error& error) const { + using namespace mbgl::style::expression; + if (isUndefined(value)) { + return ColorRampPropertyValue(); + } else if (isExpression(value)) { + ParsingContext ctx(type::Color); + ParseResult expression = ctx.parseLayerPropertyExpression(value); + if (!expression) { + error = { ctx.getCombinedErrors() }; + return {}; + } + assert(*expression); + if (!isFeatureConstant(**expression)) { + error = { "property expressions not supported" }; + return {}; + } + if (!isZoomConstant(**expression)) { + error = { "zoom expressions not supported" }; + return {}; + } + return {ColorRampPropertyValue(std::move(*expression))}; + } else { + error = { "color ramp must be an expression" }; + return {}; + } + } +}; + +} // namespace conversion +} // namespace style +} // namespace mbgl |