jtBaseApp/node_modules/@cesium/engine/Source/Core/OffsetGeometryInstanceAttribute.js

import Check from "./Check.js";
import ComponentDatatype from "./ComponentDatatype.js";
import defaultValue from "./defaultValue.js";
import defined from "./defined.js";

/**
 * Value and type information for per-instance geometry attribute that determines the geometry instance offset
 *
 * @alias OffsetGeometryInstanceAttribute
 * @constructor
 *
 * @param {number} [x=0] The x translation
 * @param {number} [y=0] The y translation
 * @param {number} [z=0] The z translation
 *
 * @private
 *
 * @see GeometryInstance
 * @see GeometryInstanceAttribute
 */
function OffsetGeometryInstanceAttribute(x, y, z) {
  x = defaultValue(x, 0);
  y = defaultValue(y, 0);
  z = defaultValue(z, 0);

  /**
   * The values for the attributes stored in a typed array.
   *
   * @type Float32Array
   */
  this.value = new Float32Array([x, y, z]);
}

Object.defineProperties(OffsetGeometryInstanceAttribute.prototype, {
  /**
   * The datatype of each component in the attribute, e.g., individual elements in
   * {@link OffsetGeometryInstanceAttribute#value}.
   *
   * @memberof OffsetGeometryInstanceAttribute.prototype
   *
   * @type {ComponentDatatype}
   * @readonly
   *
   * @default {@link ComponentDatatype.FLOAT}
   */
  componentDatatype: {
    get: function () {
      return ComponentDatatype.FLOAT;
    },
  },

  /**
   * The number of components in the attributes, i.e., {@link OffsetGeometryInstanceAttribute#value}.
   *
   * @memberof OffsetGeometryInstanceAttribute.prototype
   *
   * @type {number}
   * @readonly
   *
   * @default 3
   */
  componentsPerAttribute: {
    get: function () {
      return 3;
    },
  },

  /**
   * When <code>true</code> and <code>componentDatatype</code> is an integer format,
   * indicate that the components should be mapped to the range [0, 1] (unsigned)
   * or [-1, 1] (signed) when they are accessed as floating-point for rendering.
   *
   * @memberof OffsetGeometryInstanceAttribute.prototype
   *
   * @type {boolean}
   * @readonly
   *
   * @default false
   */
  normalize: {
    get: function () {
      return false;
    },
  },
});

/**
 * Creates a new {@link OffsetGeometryInstanceAttribute} instance given the provided an enabled flag and {@link DistanceDisplayCondition}.
 *
 * @param {Cartesian3} offset The cartesian offset
 * @returns {OffsetGeometryInstanceAttribute} The new {@link OffsetGeometryInstanceAttribute} instance.
 */
OffsetGeometryInstanceAttribute.fromCartesian3 = function (offset) {
  //>>includeStart('debug', pragmas.debug);
  Check.defined("offset", offset);
  //>>includeEnd('debug');

  return new OffsetGeometryInstanceAttribute(offset.x, offset.y, offset.z);
};

/**
 * Converts a distance display condition to a typed array that can be used to assign a distance display condition attribute.
 *
 * @param {Cartesian3} offset The cartesian offset
 * @param {Float32Array} [result] The array to store the result in, if undefined a new instance will be created.
 * @returns {Float32Array} The modified result parameter or a new instance if result was undefined.
 *
 * @example
 * const attributes = primitive.getGeometryInstanceAttributes('an id');
 * attributes.modelMatrix = Cesium.OffsetGeometryInstanceAttribute.toValue(modelMatrix, attributes.modelMatrix);
 */
OffsetGeometryInstanceAttribute.toValue = function (offset, result) {
  //>>includeStart('debug', pragmas.debug);
  Check.defined("offset", offset);
  //>>includeEnd('debug');

  if (!defined(result)) {
    result = new Float32Array([offset.x, offset.y, offset.z]);
  }

  result[0] = offset.x;
  result[1] = offset.y;
  result[2] = offset.z;
  return result;
};
export default OffsetGeometryInstanceAttribute;