123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179 |
- /*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.
- * <br /><br />
- * If this object was destroyed, it should not be used; calling any function other than
- * <code>isDestroyed</code> will result in a {@link DeveloperError} exception.
- *
- * @returns {Boolean} <code>true</code> if this object was destroyed; otherwise, <code>false</code>.
- *
- * @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.
- * <br /><br />
- * Once an object is destroyed, it should not be used; calling any function other than
- * <code>isDestroyed</code> will result in a {@link DeveloperError} exception. Therefore,
- * assign the return value (<code>undefined</code>) 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;
- });
|