cesium
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CesiumJS is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin.
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JavaScript
import AssociativeArray from '../Core/AssociativeArray.js';
import Cartesian2 from '../Core/Cartesian2.js';
import Cartesian3 from '../Core/Cartesian3.js';
import Color from '../Core/Color.js';
import defaultValue from '../Core/defaultValue.js';
import defined from '../Core/defined.js';
import destroyObject from '../Core/destroyObject.js';
import DeveloperError from '../Core/DeveloperError.js';
import DistanceDisplayCondition from '../Core/DistanceDisplayCondition.js';
import NearFarScalar from '../Core/NearFarScalar.js';
import HeightReference from '../Scene/HeightReference.js';
import HorizontalOrigin from '../Scene/HorizontalOrigin.js';
import LabelStyle from '../Scene/LabelStyle.js';
import VerticalOrigin from '../Scene/VerticalOrigin.js';
import BoundingSphereState from './BoundingSphereState.js';
import Property from './Property.js';
var defaultScale = 1.0;
var defaultFont = '30px sans-serif';
var defaultStyle = LabelStyle.FILL;
var defaultFillColor = Color.WHITE;
var defaultOutlineColor = Color.BLACK;
var defaultOutlineWidth = 1.0;
var defaultShowBackground = false;
var defaultBackgroundColor = new Color(0.165, 0.165, 0.165, 0.8);
var defaultBackgroundPadding = new Cartesian2(7, 5);
var defaultPixelOffset = Cartesian2.ZERO;
var defaultEyeOffset = Cartesian3.ZERO;
var defaultHeightReference = HeightReference.NONE;
var defaultHorizontalOrigin = HorizontalOrigin.CENTER;
var defaultVerticalOrigin = VerticalOrigin.CENTER;
var positionScratch = new Cartesian3();
var fillColorScratch = new Color();
var outlineColorScratch = new Color();
var backgroundColorScratch = new Color();
var backgroundPaddingScratch = new Cartesian2();
var eyeOffsetScratch = new Cartesian3();
var pixelOffsetScratch = new Cartesian2();
var translucencyByDistanceScratch = new NearFarScalar();
var pixelOffsetScaleByDistanceScratch = new NearFarScalar();
var scaleByDistanceScratch = new NearFarScalar();
var distanceDisplayConditionScratch = new DistanceDisplayCondition();
function EntityData(entity) {
this.entity = entity;
this.label = undefined;
this.index = undefined;
}
/**
* A {@link Visualizer} which maps the {@link LabelGraphics} instance
* in {@link Entity#label} to a {@link Label}.
* @alias LabelVisualizer
* @constructor
*
* @param {EntityCluster} entityCluster The entity cluster to manage the collection of billboards and optionally cluster with other entities.
* @param {EntityCollection} entityCollection The entityCollection to visualize.
*/
function LabelVisualizer(entityCluster, entityCollection) {
//>>includeStart('debug', pragmas.debug);
if (!defined(entityCluster)) {
throw new DeveloperError('entityCluster is required.');
}
if (!defined(entityCollection)) {
throw new DeveloperError('entityCollection is required.');
}
//>>includeEnd('debug');
entityCollection.collectionChanged.addEventListener(LabelVisualizer.prototype._onCollectionChanged, this);
this._cluster = entityCluster;
this._entityCollection = entityCollection;
this._items = new AssociativeArray();
this._onCollectionChanged(entityCollection, entityCollection.values, [], []);
}
/**
* Updates the primitives created by this visualizer to match their
* Entity counterpart at the given time.
*
* @param {JulianDate} time The time to update to.
* @returns {Boolean} This function always returns true.
*/
LabelVisualizer.prototype.update = function(time) {
//>>includeStart('debug', pragmas.debug);
if (!defined(time)) {
throw new DeveloperError('time is required.');
}
//>>includeEnd('debug');
var items = this._items.values;
var cluster = this._cluster;
for (var i = 0, len = items.length; i < len; i++) {
var item = items[i];
var entity = item.entity;
var labelGraphics = entity._label;
var text;
var label = item.label;
var show = entity.isShowing && entity.isAvailable(time) && Property.getValueOrDefault(labelGraphics._show, time, true);
var position;
if (show) {
position = Property.getValueOrUndefined(entity._position, time, positionScratch);
text = Property.getValueOrUndefined(labelGraphics._text, time);
show = defined(position) && defined(text);
}
if (!show) {
//don't bother creating or updating anything else
returnPrimitive(item, entity, cluster);
continue;
}
if (!Property.isConstant(entity._position)) {
cluster._clusterDirty = true;
}
var updateClamping = false;
var heightReference = Property.getValueOrDefault(labelGraphics._heightReference, time, defaultHeightReference);
if (!defined(label)) {
label = cluster.getLabel(entity);
label.id = entity;
item.label = label;
// If this new label happens to have a position and height reference that match our new values,
// label._updateClamping will not be called automatically. That's a problem because the clamped
// height may be based on different terrain than is now loaded. So we'll manually call
// _updateClamping below.
updateClamping = Cartesian3.equals(label.position, position) && label.heightReference === heightReference;
}
label.show = true;
label.position = position;
label.text = text;
label.scale = Property.getValueOrDefault(labelGraphics._scale, time, defaultScale);
label.font = Property.getValueOrDefault(labelGraphics._font, time, defaultFont);
label.style = Property.getValueOrDefault(labelGraphics._style, time, defaultStyle);
label.fillColor = Property.getValueOrDefault(labelGraphics._fillColor, time, defaultFillColor, fillColorScratch);
label.outlineColor = Property.getValueOrDefault(labelGraphics._outlineColor, time, defaultOutlineColor, outlineColorScratch);
label.outlineWidth = Property.getValueOrDefault(labelGraphics._outlineWidth, time, defaultOutlineWidth);
label.showBackground = Property.getValueOrDefault(labelGraphics._showBackground, time, defaultShowBackground);
label.backgroundColor = Property.getValueOrDefault(labelGraphics._backgroundColor, time, defaultBackgroundColor, backgroundColorScratch);
label.backgroundPadding = Property.getValueOrDefault(labelGraphics._backgroundPadding, time, defaultBackgroundPadding, backgroundPaddingScratch);
label.pixelOffset = Property.getValueOrDefault(labelGraphics._pixelOffset, time, defaultPixelOffset, pixelOffsetScratch);
label.eyeOffset = Property.getValueOrDefault(labelGraphics._eyeOffset, time, defaultEyeOffset, eyeOffsetScratch);
label.heightReference = heightReference;
label.horizontalOrigin = Property.getValueOrDefault(labelGraphics._horizontalOrigin, time, defaultHorizontalOrigin);
label.verticalOrigin = Property.getValueOrDefault(labelGraphics._verticalOrigin, time, defaultVerticalOrigin);
label.translucencyByDistance = Property.getValueOrUndefined(labelGraphics._translucencyByDistance, time, translucencyByDistanceScratch);
label.pixelOffsetScaleByDistance = Property.getValueOrUndefined(labelGraphics._pixelOffsetScaleByDistance, time, pixelOffsetScaleByDistanceScratch);
label.scaleByDistance = Property.getValueOrUndefined(labelGraphics._scaleByDistance, time, scaleByDistanceScratch);
label.distanceDisplayCondition = Property.getValueOrUndefined(labelGraphics._distanceDisplayCondition, time, distanceDisplayConditionScratch);
label.disableDepthTestDistance = Property.getValueOrUndefined(labelGraphics._disableDepthTestDistance, time);
if (updateClamping) {
label._updateClamping();
}
}
return true;
};
/**
* Computes a bounding sphere which encloses the visualization produced for the specified entity.
* The bounding sphere is in the fixed frame of the scene's globe.
*
* @param {Entity} entity The entity whose bounding sphere to compute.
* @param {BoundingSphere} result The bounding sphere onto which to store the result.
* @returns {BoundingSphereState} BoundingSphereState.DONE if the result contains the bounding sphere,
* BoundingSphereState.PENDING if the result is still being computed, or
* BoundingSphereState.FAILED if the entity has no visualization in the current scene.
* @private
*/
LabelVisualizer.prototype.getBoundingSphere = function(entity, result) {
//>>includeStart('debug', pragmas.debug);
if (!defined(entity)) {
throw new DeveloperError('entity is required.');
}
if (!defined(result)) {
throw new DeveloperError('result is required.');
}
//>>includeEnd('debug');
var item = this._items.get(entity.id);
if (!defined(item) || !defined(item.label)) {
return BoundingSphereState.FAILED;
}
var label = item.label;
result.center = Cartesian3.clone(defaultValue(label._clampedPosition, label.position), result.center);
result.radius = 0;
return BoundingSphereState.DONE;
};
/**
* Returns true if this object was destroyed; otherwise, false.
*
* @returns {Boolean} True if this object was destroyed; otherwise, false.
*/
LabelVisualizer.prototype.isDestroyed = function() {
return false;
};
/**
* Removes and destroys all primitives created by this instance.
*/
LabelVisualizer.prototype.destroy = function() {
this._entityCollection.collectionChanged.removeEventListener(LabelVisualizer.prototype._onCollectionChanged, this);
var entities = this._entityCollection.values;
for (var i = 0; i < entities.length; i++) {
this._cluster.removeLabel(entities[i]);
}
return destroyObject(this);
};
LabelVisualizer.prototype._onCollectionChanged = function(entityCollection, added, removed, changed) {
var i;
var entity;
var items = this._items;
var cluster = this._cluster;
for (i = added.length - 1; i > -1; i--) {
entity = added[i];
if (defined(entity._label) && defined(entity._position)) {
items.set(entity.id, new EntityData(entity));
}
}
for (i = changed.length - 1; i > -1; i--) {
entity = changed[i];
if (defined(entity._label) && defined(entity._position)) {
if (!items.contains(entity.id)) {
items.set(entity.id, new EntityData(entity));
}
} else {
returnPrimitive(items.get(entity.id), entity, cluster);
items.remove(entity.id);
}
}
for (i = removed.length - 1; i > -1; i--) {
entity = removed[i];
returnPrimitive(items.get(entity.id), entity, cluster);
items.remove(entity.id);
}
};
function returnPrimitive(item, entity, cluster) {
if (defined(item)) {
item.label = undefined;
cluster.removeLabel(entity);
}
}
export default LabelVisualizer;