/*global define*/ define([ '../Core/buildModuleUrl', '../Core/Cartesian3', '../Core/defaultValue', '../Core/defined', '../Core/defineProperties', '../Core/destroyObject', '../Core/Ellipsoid', '../Core/IauOrientationAxes', '../Core/Matrix3', '../Core/Matrix4', '../Core/Simon1994PlanetaryPositions', '../Core/Transforms', './EllipsoidPrimitive', './Material' ], function( buildModuleUrl, Cartesian3, defaultValue, defined, defineProperties, destroyObject, Ellipsoid, IauOrientationAxes, Matrix3, Matrix4, Simon1994PlanetaryPositions, Transforms, EllipsoidPrimitive, Material) { "use strict"; /** * Draws the Moon in 3D. * @alias Moon * @constructor * * @param {Object} [options] Object with the following properties: * @param {Boolean} [options.show=true] Determines whether the moon will be rendered. * @param {String} [options.textureUrl=buildModuleUrl('Assets/Textures/moonSmall.jpg')] The moon texture. * @param {Ellipsoid} [options.ellipsoid=Ellipsoid.MOON] The moon ellipsoid. * @param {Boolean} [options.onlySunLighting=true] Use the sun as the only light source. * * @see Scene#moon * * @example * scene.moon = new Cesium.Moon(); */ var Moon = function(options) { options = defaultValue(options, defaultValue.EMPTY_OBJECT); var url = options.textureUrl; if (!defined(url)) { url = buildModuleUrl('Assets/Textures/moonSmall.jpg'); } /** * Determines if the moon will be shown. * * @type {Boolean} * @default true */ this.show = defaultValue(options.show, true); /** * The moon texture. * @type {String} * @default buildModuleUrl('Assets/Textures/moonSmall.jpg') */ this.textureUrl = url; this._ellipsoid = defaultValue(options.ellipsoid, Ellipsoid.MOON); /** * Use the sun as the only light source. * @type {Boolean} * @default true */ this.onlySunLighting = defaultValue(options.onlySunLighting, true); this._ellipsoidPrimitive = new EllipsoidPrimitive({ radii : this.ellipsoid.radii, material : Material.fromType(Material.ImageType), _owner : this }); this._ellipsoidPrimitive.material.translucent = false; this._axes = new IauOrientationAxes(); }; defineProperties(Moon.prototype, { /** * Get the ellipsoid that defines the shape of the moon. * * @memberof Moon.prototype * * @type {Ellipsoid} * @readonly * * @default {@link Ellipsoid.MOON} */ ellipsoid : { get : function() { return this._ellipsoid; } } }); var icrfToFixed = new Matrix3(); var rotationScratch = new Matrix3(); var translationScratch = new Cartesian3(); /** * @private */ Moon.prototype.update = function(context, frameState, commandList) { if (!this.show) { return; } var ellipsoidPrimitive = this._ellipsoidPrimitive; ellipsoidPrimitive.material.uniforms.image = this.textureUrl; ellipsoidPrimitive.onlySunLighting = this.onlySunLighting; var date = frameState.time; if (!defined(Transforms.computeIcrfToFixedMatrix(date, icrfToFixed))) { Transforms.computeTemeToPseudoFixedMatrix(date, icrfToFixed); } var rotation = this._axes.evaluate(date, rotationScratch); Matrix3.transpose(rotation, rotation); Matrix3.multiply(icrfToFixed, rotation, rotation); var translation = Simon1994PlanetaryPositions.computeMoonPositionInEarthInertialFrame(date, translationScratch); Matrix3.multiplyByVector(icrfToFixed, translation, translation); Matrix4.fromRotationTranslation(rotation, translation, ellipsoidPrimitive.modelMatrix); ellipsoidPrimitive.update(context, frameState, commandList); }; /** * Returns true if this object was destroyed; otherwise, false. *

* If this object was destroyed, it should not be used; calling any function other than * isDestroyed will result in a {@link DeveloperError} exception. * * @returns {Boolean} true if this object was destroyed; otherwise, false. * * @see Moon#destroy */ Moon.prototype.isDestroyed = function() { return false; }; /** * Destroys the WebGL resources held by this object. Destroying an object allows for deterministic * release of WebGL resources, instead of relying on the garbage collector to destroy this object. *

* Once an object is destroyed, it should not be used; calling any function other than * isDestroyed will result in a {@link DeveloperError} exception. Therefore, * assign the return value (undefined) to the object as done in the example. * * @returns {undefined} * * @exception {DeveloperError} This object was destroyed, i.e., destroy() was called. * * @see Moon#isDestroyed * * @example * moon = moon && moon.destroy(); */ Moon.prototype.destroy = function() { this._ellipsoidPrimitive = this._ellipsoidPrimitive && this._ellipsoidPrimitive.destroy(); return destroyObject(this); }; return Moon; });