'use strict';
define(
[
'cesium',
'models/maps/assets/MapAsset',
'models/maps/AssetColorPalette',
'collections/maps/VectorFilters'
],
function (
Cesium,
MapAsset,
AssetColorPalette,
VectorFilters
) {
/**
* @classdesc A Cesium3DTileset Model is a special type of vector layer that can be used in
* Cesium maps, and that follows the 3d-tiles specification. See
* {@link https://github.com/CesiumGS/3d-tiles}
* @classcategory Models/Maps/Assets
* @class Cesium3DTileset
* @name Cesium3DTileset
* @extends MapAsset
* @since 2.18.0
* @constructor
*/
var Cesium3DTileset = MapAsset.extend(
/** @lends Cesium3DTileset.prototype */ {
/**
* The name of this type of model
* @type {string}
*/
type: 'Cesium3DTileset',
/**
* Options that are supported for creating 3D tilesets. The object will be passed
* to `Cesium.Cesium3DTileset(options)` as options, so the properties listed in
* the Cesium3DTileset documentation are also supported, see
* {@link https://cesium.com/learn/cesiumjs/ref-doc/Cesium3DTileset.html}
* @typedef {Object} Cesium3DTileset#cesiumOptions
* @property {string|number} ionAssetId - If this tileset is hosted by Cesium Ion,
* then Ion asset ID.
* @property {string} cesiumToken - If this tileset is hosted by Cesium Ion, then
* the token needed to access this resource. If one is not set, then the default
* set in the repository's {@link AppConfig#cesiumToken} will be used.
*/
/**
* Default attributes for Cesium3DTileset models
* @name Cesium3DTileset#defaults
* @extends MapAsset#defaults
* @type {Object}
* @property {'Cesium3DTileset'} type The format of the data. Must be
* 'Cesium3DTileset'.
* @property {VectorFilters} [filters=new VectorFilters()] A set of conditions
* used to show or hide specific features of this tileset.
* @property {AssetColorPalette} [colorPalette=new AssetColorPalette()] The color
* or colors mapped to attributes of this asset. Used to style the features and to
* make a legend.
* @property {Cesium.Cesium3DTileset} cesiumModel A model created and used by
* Cesium that organizes the data to display in the Cesium Widget. See
* {@link https://cesium.com/learn/cesiumjs/ref-doc/Cesium3DTileset.html}
* @property {Cesium3DTileset#cesiumOptions} cesiumOptions options are passed
* to the function that creates the Cesium model. The properties of options are
* specific to each type of asset.
*/
defaults: function () {
return Object.assign(
{},
this.constructor.__super__.defaults(),
{
type: 'Cesium3DTileset',
filters: new VectorFilters(),
cesiumModel: null,
cesiumOptions: {},
colorPalette: new AssetColorPalette(),
icon: '<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="m12.6 12.8 4.9 5c.2.2.2.6 0 .8l-5 5c-.2.1-.5.1-.8 0l-4.9-5a.6.6 0 0 1 0-.8l5-5c.2-.2.5-.2.8 0ZM6.3 6.6l5 5v.7l-5 5c-.2.2-.6.2-.8 0l-5-5a.6.6 0 0 1 0-.8l5-5c.2-.1.6-.1.8 0Zm11 7.8 1.7 1.8c.3.2.3.6 0 .8l-.2.3c-.2.2-.6.2-.8 0l-1.8-1.8c-.2-.3-.2-.6 0-.9l.2-.2c.3-.2.6-.2.9 0ZM22 9.7l1.7 1.8c.3.2.3.6 0 .8l-3.3 3.4c-.2.2-.6.2-.9 0l-1.7-1.8a.6.6 0 0 1 0-.8L21 9.7c.3-.2.6-.2.9 0Zm-6-.2 1.7 1.7c.3.3.3.6 0 .9l-2 2c-.2.2-.6.2-.9 0l-1.7-1.8c-.2-.2-.3-.6 0-.8l2-2c.3-.3.6-.3.9 0ZM12.6.3l4.9 5c.2.2.2.5 0 .8l-5 4.9c-.2.2-.5.2-.8 0L6.8 6a.6.6 0 0 1 0-.8l5-4.9c.2-.2.5-.2.8 0Zm6.2 6.3 1.8 1.7c.2.3.2.7 0 1L19 10.7c-.3.3-.7.3-1 0L16.6 9c-.3-.2-.3-.6 0-1l1.4-1.3c.3-.3.7-.3 1 0Z"/></svg>',
featureType: Cesium.Cesium3DTileFeature
}
);
},
/**
* Executed when a new Cesium3DTileset model is created.
* @param {MapConfig#MapAssetConfig} [assetConfig] The initial values of the
* attributes, which will be set on the model.
*/
initialize: function (assetConfig) {
try {
MapAsset.prototype.initialize.call(this, assetConfig);
if (assetConfig.filters) {
this.set('filters', new VectorFilters(assetConfig.filters))
}
this.createCesiumModel();
}
catch (error) {
console.log(
'There was an error initializing a 3DTileset model' +
'. Error details: ' + error
);
}
},
/**
* Creates a Cesium.Cesium3DTileset model and sets it to this model's
* 'cesiumModel' attribute. This cesiumModel contains all the information required
* for Cesium to render tiles. See
* {@link https://cesium.com/learn/cesiumjs/ref-doc/Cesium3DTileset.html?classFilter=3Dtiles}
* @param {Boolean} recreate - Set recreate to true to force the function create
* the Cesium Model again. Otherwise, if a cesium model already exists, that is
* returned instead.
*/
createCesiumModel: function (recreate = false) {
try {
// If the cesium model already exists, don't create it again unless specified
const currentModel = this.get('cesiumModel')
if (!recreate && currentModel) return currentModel
const model = this;
const cesiumOptions = this.getCesiumOptions();
let cesiumModel = null
if (!cesiumOptions) {
model.set('status', 'error');
model.set('statusDetails', 'No options were set for this tileset.');
return;
}
model.resetStatus();
// If this tileset is a Cesium Ion resource set the url from the asset Id
cesiumOptions.url = this.getCesiumURL(cesiumOptions) || cesiumOptions.url;
cesiumModel = new Cesium.Cesium3DTileset(cesiumOptions)
model.set('cesiumModel', cesiumModel)
cesiumModel.readyPromise
.then(function () {
// Let the map views know that the tileset is ready to render
model.set('status', 'ready');
// Listen to changes in the opacity, color, etc
model.setListeners();
// Set the initial visibility, opacity, filters, and colors
model.updateAppearance();
})
.otherwise(function (error) {
// See https://cesium.com/learn/cesiumjs/ref-doc/RequestErrorEvent.html
let details = error;
// Write a helpful error message
switch (error.statusCode) {
case 404:
details = 'The resource was not found (error code 404).'
break;
case 500:
details = 'There was a server error (error code 500).'
break;
}
model.set('status', 'error');
model.set('statusDetails', details)
})
}
catch (error) {
console.log(
'Failed to create a Cesium Model within a 3D Tileset model' +
'. Error details: ' + error
);
}
},
/**
* Checks whether there is an asset ID for a Cesium Ion resource and if
* so, return the URL to the resource.
* @returns {string} The URL to the Cesium Ion resource
* @since 2.26.0
*/
getCesiumURL: function () {
try {
const cesiumOptions = this.getCesiumOptions();
if (!cesiumOptions || !cesiumOptions.ionAssetId) return null
// The Cesium Ion ID of the resource to access
const assetId = Number(cesiumOptions.ionAssetId)
// Options to pass to Cesium's fromAssetId function. Access token
// needs to be set before requesting cesium ion resources
const ionResourceOptions = {
accessToken: cesiumOptions.cesiumToken ||
MetacatUI.appModel.get('cesiumToken')
}
// Create the new URL and set it on the model options
return Cesium.IonResource.fromAssetId(assetId, ionResourceOptions);
}
catch (error) {
console.log(
'There was an error settings a Cesium URL in a Cesium3DTileset' +
'. Error details: ' + error
);
}
},
/**
* Set listeners that update the cesium model when the backbone model is updated.
*/
setListeners: function () {
try {
// call the super method
this.constructor.__super__.setListeners.call(this);
// When opacity, color, or visibility changes (will also update the filters)
this.stopListening(this, 'change:opacity change:color change:visible')
this.listenTo(
this, 'change:opacity change:color change:visible', this.updateAppearance
)
// When filters change
this.stopListening(this.get('filters'), 'update')
this.listenTo(this.get('filters'), 'update', this.updateFeatureVisibility)
}
catch (error) {
console.log(
'There was an error setting listeners in a Cesium3DTileset' +
'. Error details: ' + error
);
}
},
/**
* Sets a new Cesium3DTileStyle on the Cesium 3D tileset model's style property,
* based on the attributes set on this model.
*/
updateAppearance: function () {
try {
const model = this;
// The style set on the Cesium 3D tileset needs to be updated to show the
// changes on a Cesium map.
const cesiumModel = model.get('cesiumModel')
if(!cesiumModel) return
// If the layer isn't visible at all, don't bother setting up colors or
// filters. Just set every feature to hidden.
if (!model.isVisible()) {
cesiumModel.style = new Cesium.Cesium3DTileStyle({
show: false
});
// Indicate that the layer is hidden if the opacity is zero by updating the
// visibility property
if (model.get('opacity') === 0) {
model.set('visible', false);
}
// Let the map and/or other parent views know that a change has been made
// that requires the map to be re-rendered
model.trigger('appearanceChanged')
} else {
// Set a new 3D style with a function that Cesium will use to shade each
// feature.
cesiumModel.style = new Cesium.Cesium3DTileStyle({
color: {
evaluateColor: model.getColorFunction(),
}
});
// Since the style has to be reset, re-add the filters expression. This also
// triggers the appearanceChanged event
model.updateFeatureVisibility()
}
}
catch (error) {
console.log(
'There was an error updating a 3D Tile style property in a Cesium3DTileset' +
'. Error details: ' + error
);
}
},
/**
* Updates the Cesium style set on this tileset. Adds a new expression to the
* show property that will filter the features based on the filters set on this
* model.
*/
updateFeatureVisibility: function () {
try {
const model = this;
const cesiumModel = this.get('cesiumModel')
const filters = this.get('filters')
// If there are no filters, just set the show property to true
if (!filters || !filters.length) {
cesiumModel.style.show = true
} else {
const expression = new Cesium.StyleExpression()
expression.evaluate = function (feature) {
const properties = model.getPropertiesFromFeature(feature)
return model.featureIsVisible(properties)
}
cesiumModel.style.show = expression
}
model.trigger('appearanceChanged')
}
catch (error) {
console.log(
'There was an error in a Cesium3DTileset' +
'. Error details: ' + error
);
}
},
/**
* Given a feature from a Cesium 3D tileset, returns any properties that are set
* on the feature, similar to an attributes table.
* @param {Cesium.Cesium3DTileFeature} feature A Cesium 3D Tile feature
* @returns {Object} An object containing key-value mapping of property names to
* properties.
*/
getPropertiesFromFeature: function(feature) {
if (!this.usesFeatureType(feature)) return null
let properties = {};
feature.getPropertyNames().forEach(function (propertyName) {
properties[propertyName] = feature.getProperty(propertyName)
})
properties = this.addCustomProperties(properties)
return properties
},
/**
* Return the label for a feature from a Cesium 3D tileset
* @param {Cesium.Cesium3DTileFeature} feature A Cesium 3D Tile feature
* @returns {string} The label
* @since 2.25.0
*/
getLabelFromFeature: function (feature) {
if (!this.usesFeatureType(feature)) return null
return feature.getProperty('name') || feature.getProperty('label') || null
},
/**
* Return the Cesium3DTileset model for a feature from a Cesium 3D tileset
* @param {Cesium.Cesium3DTileFeature} feature A Cesium 3D Tile feature
* @returns {Cesium3DTileset} The model
* @since 2.25.0
*/
getCesiumModelFromFeature: function (feature) {
if (!this.usesFeatureType(feature)) return null
return feature.primitive
},
/**
* Return the ID used by Cesium for a feature from a Cesium 3D tileset
* @param {Cesium.Cesium3DTileFeature} feature A Cesium 3D Tile feature
* @returns {string} The ID
* @since 2.25.0
*/
getIDFromFeature: function (feature) {
if (!this.usesFeatureType(feature)) return null
return feature.pickId ? feature.pickId.key : null
},
/**
* Creates a function that takes a Cesium3DTileFeature (see
* {@link https://cesium.com/learn/cesiumjs/ref-doc/Cesium3DTileFeature.html}) and
* returns a Cesium color based on the colorPalette property set on this model.
* The returned function is designed to be used as the evaluateColor function that
* is set in the color property of a Cesium3DTileStyle StyleExpression. See
* {@link https://cesium.com/learn/cesiumjs/ref-doc/Cesium3DTileStyle.html#color}
* @returns {function} A Cesium 3dTile evaluate color function
*/
getColorFunction: function () {
try {
const model = this;
// Opacity of the entire layer is set by using it as the alpha for each color
const opacity = model.get('opacity')
const evaluateColor = function (feature) {
const properties = model.getPropertiesFromFeature(feature);
let featureOpacity = opacity;
// If the feature is currently selected, set the opacity to max (otherwise the
// 'silhouette' borders in the map do not show in the Cesium widget)
if (model.featureIsSelected(feature)) {
featureOpacity = 1
}
const rgb = model.getColor(properties)
if (rgb) {
return new Cesium.Color(rgb.red, rgb.green, rgb.blue, featureOpacity);
} else {
return new Cesium.Color();
}
}
return evaluateColor
}
catch (error) {
console.log(
'There was an error creating a color function in a Cesium3DTileset model' +
'. Error details: ' + error
);
}
},
/**
* Gets a Cesium Bounding Sphere that can be used to navigate to view the full
* extent of the tileset. See
* {@link https://cesium.com/learn/cesiumjs/ref-doc/BoundingSphere.html}.
* @returns {Promise} Returns a promise that resolves to a Cesium Bounding Sphere
* when ready
*/
getBoundingSphere: function () {
const model = this;
return this.whenReady()
.then(function (model) {
const tileset = model.get('cesiumModel')
const bSphere = Cesium.BoundingSphere.clone(tileset.boundingSphere);
return bSphere
})
}
});
return Cesium3DTileset;
}
);