KBE3D / KBCore / Cesium / Expression

类: Expression

An expression for a style applied to a Cesium3DTileset. <p> Evaluates an expression defined using the 3D Tiles Styling language

. </p> <p> Implements the StyleExpression interface. </p>

Examples

const expression = new Cesium.Expression('(regExp("^Chest").test(${County})) && (${YearBuilt} >= 1970)');
expression.evaluate(feature); // returns true or false depending on the feature's properties

const expression = new Cesium.Expression('(${Temperature} > 90) ? color("red") : color("white")');
expression.evaluateColor(feature, result); // returns a Cesium.Color object

参数

The expression defined using the 3D Tiles Styling language.

参数

Defines in the style.

属性

expression

readonly expression: string

Gets the expression defined in the 3D Tiles Styling language.

方法

evaluate()

evaluate(feature: Cesium3DTileFeature, result?: any): string | number | boolean | RegExp | Color | Cartesian3 | Cartesian2 | Cartesian4

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 <code>Boolean</code>, <code>Number</code>, or <code>String</code>, the corresponding JavaScript primitive type will be returned. If the result is a <code>RegExp</code>, a Javascript <code>RegExp</code> object will be returned. If the result is a <code>Cartesian2</code>, <code>Cartesian3</code>, or <code>Cartesian4</code>, a Cartesian2, Cartesian3, or Cartesian4 object will be returned. If the <code>result</code> argument is a Color, the Cartesian4 value is converted to a Color and then returned.

参数

feature

Cesium3DTileFeature

The feature whose properties may be used as variables in the expression.

result?

any

The object onto which to store the result.

返回

string | number | boolean | RegExp | Color | Cartesian3 | Cartesian2 | Cartesian4

The result of evaluating the expression.

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evaluateColor()

evaluateColor(feature: Cesium3DTileFeature, result?: Color): Color

Evaluates the result of a Color expression, optionally using the provided feature's properties. <p> This is equivalent to Expression#evaluate but always returns a Color object. </p>

参数

feature

Cesium3DTileFeature

The feature whose properties may be used as variables in the expression.

result?

Color

The object in which to store the result

返回

Color

The modified result parameter or a new Color instance if one was not provided.

构造函数

构造函数

new Expression(expression?: string, defines?: any): Expression

参数

expression?

string

defines?

any

返回

Expression