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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | 1x 1x 1x 1x 1x 1x 1x 1x | import DeveloperError from "../Core/DeveloperError.js";
/**
* An expression for a style applied to a {@link Cesium3DTileset}.
* <p>
* Derived classes of this interface evaluate expressions in the
* {@link https://github.com/CesiumGS/3d-tiles/tree/main/specification/Styling|3D Tiles Styling language}.
* </p>
* <p>
* This type describes an interface and is not intended to be instantiated directly.
* </p>
*
* @alias StyleExpression
* @constructor
*
* @see Expression
* @see ConditionsExpression
*/
function StyleExpression() {}
/**
* Evaluates the result of an expression, optionally using the provided feature's properties. If the result of
* the expression in the
* {@link https://github.com/CesiumGS/3d-tiles/tree/main/specification/Styling|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 {@link Cartesian2}, {@link Cartesian3}, or {@link Cartesian4} object will be returned. If the <code>result</code> argument is
* a {@link Color}, the {@link Cartesian4} value is converted to a {@link Color} and then returned.
*
* @param {Cesium3DTileFeature} feature The feature whose properties may be used as variables in the expression.
* @param {object} [result] The object onto which to store the result.
* @returns {boolean|number|string|RegExp|Cartesian2|Cartesian3|Cartesian4|Color} The result of evaluating the expression.
*/
StyleExpression.prototype.evaluate = function (feature, result) {
DeveloperError.throwInstantiationError();
};
/**
* Evaluates the result of a Color expression, optionally using the provided feature's properties.
* <p>
* This is equivalent to {@link StyleExpression#evaluate} but always returns a {@link Color} object.
* </p>
*
* @param {Cesium3DTileFeature} feature The feature whose properties may be used as variables in the expression.
* @param {Color} [result] The object in which to store the result.
* @returns {Color} The modified result parameter or a new Color instance if one was not provided.
*/
StyleExpression.prototype.evaluateColor = function (feature, result) {
DeveloperError.throwInstantiationError();
};
/**
* Gets the shader function for this expression.
* Returns undefined if the shader function can't be generated from this expression.
*
* @param {string} functionSignature Signature of the generated function.
* @param {object} variableSubstitutionMap Maps variable names to shader variable names.
* @param {object} shaderState Stores information about the generated shader function, including whether it is translucent.
* @param {string} returnType The return type of the generated function.
*
* @returns {string} The shader function.
*
* @private
*/
StyleExpression.prototype.getShaderFunction = function (
functionSignature,
variableSubstitutionMap,
shaderState,
returnType,
) {
DeveloperError.throwInstantiationError();
};
/**
* Gets the variables used by the expression.
*
* @returns {string[]} The variables used by the expression.
*
* @private
*/
StyleExpression.prototype.getVariables = function () {
DeveloperError.throwInstantiationError();
};
export default StyleExpression;
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