/
CompositeProperty.js
157 lines (149 loc) · 5.34 KB
/
CompositeProperty.js
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define([
'../Core/defined',
'../Core/defineProperties',
'../Core/DeveloperError',
'../Core/Event',
'../Core/EventHelper',
'../Core/TimeIntervalCollection',
'./Property'
], function(
defined,
defineProperties,
DeveloperError,
Event,
EventHelper,
TimeIntervalCollection,
Property) {
'use strict';
function subscribeAll(property, eventHelper, definitionChanged, intervals) {
function callback() {
definitionChanged.raiseEvent(property);
}
var items = [];
eventHelper.removeAll();
var length = intervals.length;
for (var i = 0; i < length; i++) {
var 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
* var constantProperty = ...;
* var 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.
* var 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);
}
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;
}
}
});
/**
* Gets the value of the property at the provided time.
*
* @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.
*/
CompositeProperty.prototype.getValue = function(time, result) {
//>>includeStart('debug', pragmas.debug);
if (!defined(time)) {
throw new DeveloperError('time is required');
}
//>>includeEnd('debug');
var 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);
};
return CompositeProperty;
});