kotlin-cesium-engine/cesium.engine/Expression

Expression

external class Expression(val expression: String = definedExternally, defines: Any? = definedExternally) : StyleExpression(source)

An expression for a style applied to a Cesium3DTileset.

Evaluates an expression defined using the 3D Tiles Styling language.

Implements the StyleExpression interface.

const expression = new Expression('(regExp("^Chest").test(${County})) && (${YearBuilt} >= 1970)');
expression.evaluate(feature); // returns true or false depending on the feature's properties
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const expression = new Expression('(${Temperature} 90) ? color("red") : color("white")');
expression.evaluateColor(feature, result); // returns a Color object
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Parameters

defines

Defines in the style.

See also

Constructors

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constructor(expression: String = definedExternally, defines: Any? = definedExternally)

Properties

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val expression: String

The expression defined using the 3D Tiles Styling language.

Functions

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open override fun evaluate(feature: Cesium3DTileFeature, result: Any?): Any

Evaluates the result of an expression, optionally using the provided feature's properties. If the result of the expression in the 3D Tiles Styling language is of type Boolean, Number, or String, the corresponding JavaScript primitive type will be returned. If the result is a RegExp, a Javascript RegExp object will be returned. If the result is a Cartesian2, Cartesian3, or Cartesian4, a Cartesian2, Cartesian3, or Cartesian4 object will be returned. If the result argument is a Color, the Cartesian4 value is converted to a Color and then returned.

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open override fun evaluateColor(feature: Cesium3DTileFeature, result: Color?): Color

Evaluates the result of a Color expression, optionally using the provided feature's properties.