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import Event from "../Core/Event.js";
import EventHelper from "../Core/EventHelper.js";
import JulianDate from "../Core/JulianDate.js";
import TimeIntervalCollection from "../Core/TimeIntervalCollection.js";
import Property from "./Property.js";
function subscribeAll(property, eventHelper, definitionChanged, intervals) {
function callback() {
definitionChanged.raiseEvent(property);
}
const items = [];
eventHelper.removeAll();
const length = intervals.length;
for (let i = 0; i < length; i++) {
const interval = intervals.get(i);
if (defined(interval.data) && items.indexOf(interval.data) === -1) {
eventHelper.add(interval.data.definitionChanged, callback);
}
}
}
/**
* A {@link Property} which is defined by a {@link TimeIntervalCollection}, where the
* data property of each {@link TimeInterval} is another Property instance which is
* evaluated at the provided time.
*
* @alias CompositeProperty
* @constructor
*
*
* @example
* const constantProperty = ...;
* const sampledProperty = ...;
*
* //Create a composite property from two previously defined properties
* //where the property is valid on August 1st, 2012 and uses a constant
* //property for the first half of the day and a sampled property for the
* //remaining half.
* const composite = new Cesium.CompositeProperty();
* composite.intervals.addInterval(Cesium.TimeInterval.fromIso8601({
* iso8601 : '2012-08-01T00:00:00.00Z/2012-08-01T12:00:00.00Z',
* data : constantProperty
* }));
* composite.intervals.addInterval(Cesium.TimeInterval.fromIso8601({
* iso8601 : '2012-08-01T12:00:00.00Z/2012-08-02T00:00:00.00Z',
* isStartIncluded : false,
* isStopIncluded : false,
* data : sampledProperty
* }));
*
* @see CompositeMaterialProperty
* @see CompositePositionProperty
*/
function CompositeProperty() {
this._eventHelper = new EventHelper();
this._definitionChanged = new Event();
this._intervals = new TimeIntervalCollection();
this._intervals.changedEvent.addEventListener(
CompositeProperty.prototype._intervalsChanged,
this,
);
}
Object.defineProperties(CompositeProperty.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 CompositeProperty.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 changed whenever setValue is called with data different
* than the current value.
* @memberof CompositeProperty.prototype
*
* @type {Event}
* @readonly
*/
definitionChanged: {
get: function () {
return this._definitionChanged;
},
},
/**
* Gets the interval collection.
* @memberof CompositeProperty.prototype
*
* @type {TimeIntervalCollection}
*/
intervals: {
get: function () {
return this._intervals;
},
},
});
const timeScratch = new JulianDate();
/**
* Gets the value of the property at the provided time.
*
* @param {JulianDate} [time=JulianDate.now()] The time for which to retrieve the value. If omitted, the current system time is used.
* @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.
*/
CompositeProperty.prototype.getValue = function (time, result) {
if (!defined(time)) {
time = JulianDate.now(timeScratch);
}
const innerProperty = this._intervals.findDataForIntervalContainingDate(time);
if (defined(innerProperty)) {
return innerProperty.getValue(time, 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.
*/
CompositeProperty.prototype.equals = function (other) {
return (
this === other || //
(other instanceof CompositeProperty && //
this._intervals.equals(other._intervals, Property.equals))
);
};
/**
* @private
*/
CompositeProperty.prototype._intervalsChanged = function () {
subscribeAll(
this,
this._eventHelper,
this._definitionChanged,
this._intervals,
);
this._definitionChanged.raiseEvent(this);
};
export default CompositeProperty;
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