296 lines
11 KiB
JavaScript
296 lines
11 KiB
JavaScript
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define([
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'../Core/Cartesian3',
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'../Core/defaultValue',
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'../Core/defined',
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'../Core/defineProperties',
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'../Core/DeveloperError',
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'../Core/Event',
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'../Core/ReferenceFrame',
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'./PositionProperty',
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'./Property',
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'./SampledProperty'
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], function(
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Cartesian3,
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defaultValue,
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defined,
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defineProperties,
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DeveloperError,
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Event,
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ReferenceFrame,
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PositionProperty,
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Property,
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SampledProperty) {
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'use strict';
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/**
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* A {@link SampledProperty} which is also a {@link PositionProperty}.
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*
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* @alias SampledPositionProperty
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* @constructor
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*
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* @param {ReferenceFrame} [referenceFrame=ReferenceFrame.FIXED] The reference frame in which the position is defined.
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* @param {Number} [numberOfDerivatives=0] The number of derivatives that accompany each position; i.e. velocity, acceleration, etc...
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*/
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function SampledPositionProperty(referenceFrame, numberOfDerivatives) {
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numberOfDerivatives = defaultValue(numberOfDerivatives, 0);
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var derivativeTypes;
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if (numberOfDerivatives > 0) {
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derivativeTypes = new Array(numberOfDerivatives);
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for (var i = 0; i < numberOfDerivatives; i++) {
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derivativeTypes[i] = Cartesian3;
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}
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}
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this._numberOfDerivatives = numberOfDerivatives;
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this._property = new SampledProperty(Cartesian3, derivativeTypes);
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this._definitionChanged = new Event();
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this._referenceFrame = defaultValue(referenceFrame, ReferenceFrame.FIXED);
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this._property._definitionChanged.addEventListener(function() {
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this._definitionChanged.raiseEvent(this);
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}, this);
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}
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defineProperties(SampledPositionProperty.prototype, {
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/**
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* Gets a value indicating if this property is constant. A property is considered
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* constant if getValue always returns the same result for the current definition.
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* @memberof SampledPositionProperty.prototype
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*
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* @type {Boolean}
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* @readonly
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*/
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isConstant : {
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get : function() {
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return this._property.isConstant;
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}
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},
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/**
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* Gets the event that is raised whenever the definition of this property changes.
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* The definition is considered to have changed if a call to getValue would return
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* a different result for the same time.
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* @memberof SampledPositionProperty.prototype
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*
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* @type {Event}
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* @readonly
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*/
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definitionChanged : {
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get : function() {
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return this._definitionChanged;
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}
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},
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/**
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* Gets the reference frame in which the position is defined.
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* @memberof SampledPositionProperty.prototype
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* @type {ReferenceFrame}
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* @default ReferenceFrame.FIXED;
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*/
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referenceFrame : {
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get : function() {
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return this._referenceFrame;
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}
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},
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/**
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* Gets the degree of interpolation to perform when retrieving a value.
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* @memberof SampledPositionProperty.prototype
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*
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* @type {Number}
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* @default 1
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*/
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interpolationDegree : {
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get : function() {
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return this._property.interpolationDegree;
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}
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},
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/**
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* Gets the interpolation algorithm to use when retrieving a value.
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* @memberof SampledPositionProperty.prototype
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*
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* @type {InterpolationAlgorithm}
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* @default LinearApproximation
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*/
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interpolationAlgorithm : {
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get : function() {
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return this._property.interpolationAlgorithm;
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}
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},
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/**
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* The number of derivatives contained by this property; i.e. 0 for just position, 1 for velocity, etc.
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* @memberof SampledPositionProperty.prototype
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*
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* @type {Boolean}
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* @default false
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*/
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numberOfDerivatives : {
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get : function() {
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return this._numberOfDerivatives;
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}
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},
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/**
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* Gets or sets the type of extrapolation to perform when a value
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* is requested at a time after any available samples.
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* @memberof SampledPositionProperty.prototype
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* @type {ExtrapolationType}
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* @default ExtrapolationType.NONE
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*/
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forwardExtrapolationType : {
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get : function() {
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return this._property.forwardExtrapolationType;
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},
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set : function(value) {
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this._property.forwardExtrapolationType = value;
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}
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},
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/**
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* Gets or sets the amount of time to extrapolate forward before
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* the property becomes undefined. A value of 0 will extrapolate forever.
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* @memberof SampledPositionProperty.prototype
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* @type {Number}
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* @default 0
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*/
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forwardExtrapolationDuration : {
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get : function() {
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return this._property.forwardExtrapolationDuration;
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},
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set : function(value) {
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this._property.forwardExtrapolationDuration = value;
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}
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},
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/**
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* Gets or sets the type of extrapolation to perform when a value
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* is requested at a time before any available samples.
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* @memberof SampledPositionProperty.prototype
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* @type {ExtrapolationType}
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* @default ExtrapolationType.NONE
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*/
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backwardExtrapolationType : {
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get : function() {
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return this._property.backwardExtrapolationType;
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},
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set : function(value) {
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this._property.backwardExtrapolationType = value;
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}
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},
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/**
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* Gets or sets the amount of time to extrapolate backward
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* before the property becomes undefined. A value of 0 will extrapolate forever.
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* @memberof SampledPositionProperty.prototype
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* @type {Number}
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* @default 0
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*/
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backwardExtrapolationDuration : {
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get : function() {
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return this._property.backwardExtrapolationDuration;
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},
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set : function(value) {
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this._property.backwardExtrapolationDuration = value;
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}
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}
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});
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/**
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* Gets the position at the provided time.
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*
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* @param {JulianDate} time The time for which to retrieve the value.
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* @param {Cartesian3} [result] The object to store the value into, if omitted, a new instance is created and returned.
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* @returns {Cartesian3} The modified result parameter or a new instance if the result parameter was not supplied.
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*/
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SampledPositionProperty.prototype.getValue = function(time, result) {
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return this.getValueInReferenceFrame(time, ReferenceFrame.FIXED, result);
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};
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/**
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* Gets the position at the provided time and in the provided reference frame.
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*
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* @param {JulianDate} time The time for which to retrieve the value.
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* @param {ReferenceFrame} referenceFrame The desired referenceFrame of the result.
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* @param {Cartesian3} [result] The object to store the value into, if omitted, a new instance is created and returned.
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* @returns {Cartesian3} The modified result parameter or a new instance if the result parameter was not supplied.
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*/
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SampledPositionProperty.prototype.getValueInReferenceFrame = function(time, referenceFrame, result) {
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//>>includeStart('debug', pragmas.debug);
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if (!defined(time)) {
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throw new DeveloperError('time is required.');
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}
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if (!defined(referenceFrame)) {
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throw new DeveloperError('referenceFrame is required.');
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}
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//>>includeEnd('debug');
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result = this._property.getValue(time, result);
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if (defined(result)) {
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return PositionProperty.convertToReferenceFrame(time, result, this._referenceFrame, referenceFrame, result);
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}
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return undefined;
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};
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/**
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* Sets the algorithm and degree to use when interpolating a position.
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*
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* @param {Object} [options] Object with the following properties:
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* @param {InterpolationAlgorithm} [options.interpolationAlgorithm] The new interpolation algorithm. If undefined, the existing property will be unchanged.
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* @param {Number} [options.interpolationDegree] The new interpolation degree. If undefined, the existing property will be unchanged.
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*/
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SampledPositionProperty.prototype.setInterpolationOptions = function(options) {
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this._property.setInterpolationOptions(options);
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};
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/**
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* Adds a new sample.
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*
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* @param {JulianDate} time The sample time.
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* @param {Cartesian3} position The position at the provided time.
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* @param {Cartesian3[]} [derivatives] The array of derivative values at the provided time.
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*/
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SampledPositionProperty.prototype.addSample = function(time, position, derivatives) {
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var numberOfDerivatives = this._numberOfDerivatives;
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//>>includeStart('debug', pragmas.debug);
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if (numberOfDerivatives > 0 && (!defined(derivatives) || derivatives.length !== numberOfDerivatives)) {
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throw new DeveloperError('derivatives length must be equal to the number of derivatives.');
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}
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//>>includeEnd('debug');
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this._property.addSample(time, position, derivatives);
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};
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/**
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* Adds multiple samples via parallel arrays.
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*
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* @param {JulianDate[]} times An array of JulianDate instances where each index is a sample time.
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* @param {Cartesian3[]} positions An array of Cartesian3 position instances, where each value corresponds to the provided time index.
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* @param {Array[]} [derivatives] An array where each value is another array containing derivatives for the corresponding time index.
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*
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* @exception {DeveloperError} All arrays must be the same length.
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*/
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SampledPositionProperty.prototype.addSamples = function(times, positions, derivatives) {
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this._property.addSamples(times, positions, derivatives);
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};
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/**
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* Adds samples as a single packed array where each new sample is represented as a date,
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* followed by the packed representation of the corresponding value and derivatives.
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*
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* @param {Number[]} packedSamples The array of packed samples.
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* @param {JulianDate} [epoch] If any of the dates in packedSamples are numbers, they are considered an offset from this epoch, in seconds.
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*/
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SampledPositionProperty.prototype.addSamplesPackedArray = function(packedSamples, epoch) {
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this._property.addSamplesPackedArray(packedSamples, epoch);
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};
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/**
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* Compares this property to the provided property and returns
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* <code>true</code> if they are equal, <code>false</code> otherwise.
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*
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* @param {Property} [other] The other property.
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* @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
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*/
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SampledPositionProperty.prototype.equals = function(other) {
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return this === other || //
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(other instanceof SampledPositionProperty &&
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Property.equals(this._property, other._property) && //
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this._referenceFrame === other._referenceFrame);
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};
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return SampledPositionProperty;
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});
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