/
TimeIntervalCollectionPositionProperty.js
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/
TimeIntervalCollectionPositionProperty.js
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import defaultValue from '../Core/defaultValue.js';
import defined from '../Core/defined.js';
import defineProperties from '../Core/defineProperties.js';
import DeveloperError from '../Core/DeveloperError.js';
import Event from '../Core/Event.js';
import ReferenceFrame from '../Core/ReferenceFrame.js';
import TimeIntervalCollection from '../Core/TimeIntervalCollection.js';
import PositionProperty from './PositionProperty.js';
import Property from './Property.js';
/**
* A {@link TimeIntervalCollectionProperty} which is also a {@link PositionProperty}.
*
* @alias TimeIntervalCollectionPositionProperty
* @constructor
*
* @param {ReferenceFrame} [referenceFrame=ReferenceFrame.FIXED] The reference frame in which the position is defined.
*/
function TimeIntervalCollectionPositionProperty(referenceFrame) {
this._definitionChanged = new Event();
this._intervals = new TimeIntervalCollection();
this._intervals.changedEvent.addEventListener(TimeIntervalCollectionPositionProperty.prototype._intervalsChanged, this);
this._referenceFrame = defaultValue(referenceFrame, ReferenceFrame.FIXED);
}
defineProperties(TimeIntervalCollectionPositionProperty.prototype, {
/**
* Gets a value indicating if this property is constant. A property is considered
* constant if getValue always returns the same result for the current definition.
* @memberof TimeIntervalCollectionPositionProperty.prototype
*
* @type {Boolean}
* @readonly
*/
isConstant : {
get : function() {
return this._intervals.isEmpty;
}
},
/**
* Gets the event that is raised whenever the definition of this property changes.
* The definition is considered to have changed if a call to getValue would return
* a different result for the same time.
* @memberof TimeIntervalCollectionPositionProperty.prototype
*
* @type {Event}
* @readonly
*/
definitionChanged : {
get : function() {
return this._definitionChanged;
}
},
/**
* Gets the interval collection.
* @memberof TimeIntervalCollectionPositionProperty.prototype
* @type {TimeIntervalCollection}
*/
intervals : {
get : function() {
return this._intervals;
}
},
/**
* Gets the reference frame in which the position is defined.
* @memberof TimeIntervalCollectionPositionProperty.prototype
* @type {ReferenceFrame}
* @default ReferenceFrame.FIXED;
*/
referenceFrame : {
get : function() {
return this._referenceFrame;
}
}
});
/**
* Gets the value of the property at the provided time in the fixed frame.
*
* @param {JulianDate} time The time for which to retrieve the value.
* @param {Object} [result] The object to store the value into, if omitted, a new instance is created and returned.
* @returns {Object} The modified result parameter or a new instance if the result parameter was not supplied.
*/
TimeIntervalCollectionPositionProperty.prototype.getValue = function(time, result) {
return this.getValueInReferenceFrame(time, ReferenceFrame.FIXED, result);
};
/**
* Gets the value of the property at the provided time and in the provided reference frame.
*
* @param {JulianDate} time The time for which to retrieve the value.
* @param {ReferenceFrame} referenceFrame The desired referenceFrame of the result.
* @param {Cartesian3} [result] The object to store the value into, if omitted, a new instance is created and returned.
* @returns {Cartesian3} The modified result parameter or a new instance if the result parameter was not supplied.
*/
TimeIntervalCollectionPositionProperty.prototype.getValueInReferenceFrame = function(time, referenceFrame, result) {
//>>includeStart('debug', pragmas.debug);
if (!defined(time)) {
throw new DeveloperError('time is required.');
}
if (!defined(referenceFrame)) {
throw new DeveloperError('referenceFrame is required.');
}
//>>includeEnd('debug');
var position = this._intervals.findDataForIntervalContainingDate(time);
if (defined(position)) {
return PositionProperty.convertToReferenceFrame(time, position, this._referenceFrame, referenceFrame, result);
}
return undefined;
};
/**
* Compares this property to the provided property and returns
* <code>true</code> if they are equal, <code>false</code> otherwise.
*
* @param {Property} [other] The other property.
* @returns {Boolean} <code>true</code> if left and right are equal, <code>false</code> otherwise.
*/
TimeIntervalCollectionPositionProperty.prototype.equals = function(other) {
return this === other || //
(other instanceof TimeIntervalCollectionPositionProperty && //
this._intervals.equals(other._intervals, Property.equals) && //
this._referenceFrame === other._referenceFrame);
};
/**
* @private
*/
TimeIntervalCollectionPositionProperty.prototype._intervalsChanged = function() {
this._definitionChanged.raiseEvent(this);
};
export default TimeIntervalCollectionPositionProperty;