text: /*global define*/
  define([
          '../Core/Color',
          '../Core/defined',
          '../Core/defineProperties',
          '../Core/Event',
          './createPropertyDescriptor',
          './Property'
      ], function(
          Color,
          defined,
          defineProperties,
          Event,
          createPropertyDescriptor,
          Property) {
      "use strict";
  
      var defaultColor = Color.WHITE;
      var defaultGlowPower = 0.25;
  
      /**
       * A {@link MaterialProperty} that maps to polyline glow {@link Material} uniforms.
       * @alias PolylineGlowProperty
       * @constructor
       */
      var PolylineGlowProperty = function() {
          this._definitionChanged = new Event();
          this._color = undefined;
          this._colorSubscription = undefined;
          this._glowPower = undefined;
          this._glowPowerSubscription = undefined;
      };
  
      defineProperties(PolylineGlowProperty.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 PolylineGlowProperty.prototype
           * @type {Boolean}
           * @readonly
           */
          isConstant : {
              get : function() {
                  return Property.isConstant(this._color) && Property.isConstant(this._glow);
              }
          },
          /**
           * 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 PolylineGlowProperty.prototype
           * @type {Event}
           * @readonly
           */
          definitionChanged : {
              get : function() {
                  return this._definitionChanged;
              }
          },
          /**
           * A {@link Color} {@link Property} which determines the line's color.
           * @memberof PolylineGlowProperty.prototype
           * @type {Property}
           */
          color : createPropertyDescriptor('color'),
          /**
           * A numeric {@link Property} which determines the strength of the glow, as a percentage of the total line width (less than 1.0).
           * @memberof PolylineGlowProperty.prototype
           * @type {Property}
           */
          glowPower : createPropertyDescriptor('glowPower')
      });
  
      /**
       * 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.
       */
      PolylineGlowProperty.prototype.getType = function(time) {
          return 'PolylineGlow';
      };
  
      /**
       * 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.
       */
      PolylineGlowProperty.prototype.getValue = function(time, result) {
          if (!defined(result)) {
              result = {};
          }
          result.color = Property.getValueOrClonedDefault(this._color, time, defaultColor, result.color);
          result.glowPower = Property.getValueOrDefault(this._glowPower, time, defaultGlowPower, result.glowPower);
          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.
       */
      PolylineGlowProperty.prototype.equals = function(other) {
          return this === other || //
                 (other instanceof PolylineGlowProperty && //
                  Property.equals(this._color, other._color) &&
                  Property.equals(this._glowPower, other._glowPower));
      };
  
      return PolylineGlowProperty;
  });
  