/
ImageMaterialProperty.js
126 lines (118 loc) · 4.34 KB
/
ImageMaterialProperty.js
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/*global define*/
define([
'../Core/Cartesian2',
'../Core/defined',
'../Core/defineProperties',
'../Core/Event',
'./ConstantProperty',
'./createDynamicPropertyDescriptor',
'./Property'
], function(
Cartesian2,
defined,
defineProperties,
Event,
ConstantProperty,
createDynamicPropertyDescriptor,
Property) {
"use strict";
/**
* A {@link MaterialProperty} that maps to image {@link Material} uniforms.
* @alias ImageMaterialProperty
* @constructor
*/
var ImageMaterialProperty = function() {
this._definitionChanged = new Event();
this._image = undefined;
this._imageSubscription = undefined;
this._repeat = undefined;
this._repeatSubscription = undefined;
this.repeat = new ConstantProperty(new Cartesian2(1, 1));
};
defineProperties(ImageMaterialProperty.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 ImageMaterialProperty.prototype
*
* @type {Boolean}
* @readonly
*/
isConstant : {
get : function() {
return Property.isConstant(this._image) && Property.isConstant(this._repeat);
}
},
/**
* 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 ImageMaterialProperty.prototype
*
* @type {Event}
* @readonly
*/
definitionChanged : {
get : function() {
return this._definitionChanged;
}
},
/**
* Gets or sets the string property which is the url of the desired image.
* @memberof ImageMaterialProperty.prototype
* @type {Property}
*/
image : createDynamicPropertyDescriptor('image'),
/**
* Gets or sets the {@link Cartesian2} property which determines the number of times the image repeats in each direction.
* @memberof ImageMaterialProperty.prototype
* @type {Property}
* @default new ConstantProperty(new Cartesian2(1, 1))
*/
repeat : createDynamicPropertyDescriptor('repeat')
});
/**
* Gets the {@link Material} type at the provided time.
*
* @param {JulianDate} time The time for which to retrieve the type.
* @returns {String} The type of material.
*/
ImageMaterialProperty.prototype.getType = function(time) {
return 'Image';
};
/**
* 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.
*/
ImageMaterialProperty.prototype.getValue = function(time, result) {
if (!defined(result)) {
result = {};
}
result.image = defined(this._image) ? this._image.getValue(time) : undefined;
result.repeat = defined(this._repeat) ? this._repeat.getValue(time, result.repeat) : undefined;
return result;
};
/**
* 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.
*/
ImageMaterialProperty.prototype.equals = function(other) {
return this === other || //
(other instanceof ImageMaterialProperty && //
Property.equals(this._image, other._image) && //
Property.equals(this._repeat, other._repeat));
};
/**
* @private
*/
ImageMaterialProperty.prototype._raiseDefinitionChanged = function(){
this._definitionChanged.raiseEvent(this);
};
return ImageMaterialProperty;
});