Class: Expression

var expression = new SuperMap3D.Expression('(regExp("^Chest").test(${County})) && (${YearBuilt} >= 1970)');
expression.evaluate(frameState, feature); // returns true or false depending on the feature's properties

var expression = new SuperMap3D.Expression('(${Temperature} > 90) ? color("red") : color("white")');
expression.evaluateColor(frameState, feature, result); // returns a SuperMap3D.Color object

Members

readonly expressionString

Retrieve the expression defined in the 3D tile style language.

Default Value:

undefined

Methods

evaluate(frameState, feature, result){Boolean|Number|String|RegExp|Cartesian2|Cartesian3|Cartesian4|Color}

The result of the expression can be calculated using the provided properties. If the result of an expression in the 3D Tiles style language is of type Boolean, Number, or String, the corresponding JavaScript primitive type is returned. If the result is a RegExp, return a Javascript RegExp object. If the result is Cartesian2, Cartesian3, or Cartesian4, then return a Cartesian2, Cartesian3, or Cartesian4 object. If the result parameter is Color, the Cartesian4 value is converted to Color and then returned.

Name	Type	Description
frameState	FrameState	Frame status.
feature	Cesium3DTileFeature	Its properties can be used as characteristics of variables in expressions.
result	Object	optional The object that stores the results.

Returns:

Type	Description
Boolean | Number | String | RegExp | Cartesian2 | Cartesian3 | Cartesian4 | Color	The operation result of the expression.

evaluateColor(frameState, feature, result){Color}

Evaluate the results of color expressions and choose to use the provided feature attributes.

This is equivalent to Expression#evaluate, but always returns a Color object.

Name	Type	Description
frameState	FrameState	Frame status.
feature	Cesium3DTileFeature	Feature whose attributes can be used as variables in expressions.
result	Color	optional The object that stores the results.

Returns:

Type	Description
Color	The modified result parameters, or a new color instance (if not provided).