import {
BoundingRectangle, Cartesian2, Cartesian3, defaultValue,
defined, Matrix4, Billboard, Event, BillboardCollection, EllipsoidalOccluder, Label, LabelCollection,
PointPrimitive,
PointPrimitiveCollection,
SceneMode
} from "./cesiumfake";
import KDBush from "kdbush";
/**
* Defines how screen space objects (billboards, points, labels) are clustered.
*
* @param {Object} [options] An object with the following properties:
* @param {Boolean} [options.enabled=false] Whether or not to enable clustering.
* @param {Number} [options.pixelRange=80] The pixel range to extend the screen space bounding box.
* @param {Number} [options.minimumClusterSize=2] The minimum number of screen space objects that can be clustered.
* @param {Boolean} [options.clusterBillboards=true] Whether or not to cluster the billboards of an entity.
* @param {Boolean} [options.clusterLabels=true] Whether or not to cluster the labels of an entity.
* @param {Boolean} [options.clusterPoints=true] Whether or not to cluster the points of an entity.
* @param {Boolean} [options.show=true] Determines if the entities in the cluster will be shown.
*
* @alias PrimitiveCluster
* @constructor
*
* @demo {@link https://sandcastle.cesium.com/index.html?src=Clustering.html|Cesium Sandcastle Clustering Demo}
*/
function PrimitiveCluster(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
this._enabled = defaultValue(options.enabled, false);
this._pixelRange = defaultValue(options.pixelRange, 80);
this._minimumClusterSize = defaultValue(options.minimumClusterSize, 2);
this._clusterBillboards = defaultValue(options.clusterBillboards, true);
this._clusterLabels = defaultValue(options.clusterLabels, true);
this._clusterPoints = defaultValue(options.clusterPoints, true);
this._labelCollection = undefined;
this._billboardCollection = undefined;
this._pointCollection = undefined;
this._clusterBillboardCollection = undefined;
this._clusterLabelCollection = undefined;
this._clusterPointCollection = undefined;
this._collectionIndicesByEntity = {};
this._unusedLabelIndices = [];
this._unusedBillboardIndices = [];
this._unusedPointIndices = [];
this._previousClusters = [];
this._previousHeight = undefined;
this._enabledDirty = false;
this._clusterDirty = false;
this._cluster = undefined;
this._removeEventListener = undefined;
this._clusterEvent = new Event();
this._delay = defaultValue(options.delay, 800);
/**
* Determines if entities in this collection will be shown.
*
* @type {Boolean}
* @default true
*/
this.show = defaultValue(options.show, true);
}
function getX(point) {
return point.coord.x;
}
function getY(point) {
return point.coord.y;
}
function expandBoundingBox(bbox, pixelRange) {
bbox.x -= pixelRange;
bbox.y -= pixelRange;
bbox.width += pixelRange * 2.0;
bbox.height += pixelRange * 2.0;
}
const labelBoundingBoxScratch = new BoundingRectangle();
function getBoundingBox(item, coord, pixelRange, primitiveCluster, result) {
if (defined(item._labelCollection) && primitiveCluster._clusterLabels) {
result = Label.getScreenSpaceBoundingBox(item, coord, result);
} else if (
defined(item._billboardCollection) &&
primitiveCluster._clusterBillboards
) {
result = Billboard.getScreenSpaceBoundingBox(item, coord, result);
} else if (
defined(item._pointPrimitiveCollection) &&
primitiveCluster._clusterPoints
) {
result = PointPrimitive.getScreenSpaceBoundingBox(item, coord, result);
}
expandBoundingBox(result, pixelRange);
if (
primitiveCluster._clusterLabels &&
!defined(item._labelCollection) &&
defined(item.id) &&
hasLabelIndex(primitiveCluster, item.id.id) &&
defined(item.id._label)
) {
const labelIndex =
primitiveCluster._collectionIndicesByEntity[item.id.id].labelIndex;
const label = primitiveCluster._labelCollection.get(labelIndex);
const labelBBox = Label.getScreenSpaceBoundingBox(
label,
coord,
labelBoundingBoxScratch
);
expandBoundingBox(labelBBox, pixelRange);
result = BoundingRectangle.union(result, labelBBox, result);
}
return result;
}
function addNonClusteredItem(item, primitiveCluster) {
item.clusterShow = true;
if (
!defined(item._labelCollection) &&
defined(item.id) &&
hasLabelIndex(primitiveCluster, item.id.id) &&
defined(item.id._label)
) {
const labelIndex =
primitiveCluster._collectionIndicesByEntity[item.id.id].labelIndex;
const label = primitiveCluster._labelCollection.get(labelIndex);
label.clusterShow = true;
}
}
function addCluster(position, numPoints, ids, primitiveCluster) {
const cluster = {
billboard: primitiveCluster._clusterBillboardCollection.add(),
label: primitiveCluster._clusterLabelCollection.add(),
point: primitiveCluster._clusterPointCollection.add(),
};
cluster.billboard.show = false;
cluster.point.show = false;
cluster.label.show = true;
cluster.label.text = numPoints.toLocaleString();
cluster.label.id = ids;
cluster.billboard.position = cluster.label.position = cluster.point.position = position;
primitiveCluster._clusterEvent.raiseEvent(ids, cluster);
}
function hasLabelIndex(primitiveCluster, entityId) {
return (
defined(primitiveCluster) &&
defined(primitiveCluster._collectionIndicesByEntity[entityId]) &&
defined(primitiveCluster._collectionIndicesByEntity[entityId].labelIndex)
);
}
function getScreenSpacePositions(
collection,
points,
scene,
occluder,
primitiveCluster
) {
if (!defined(collection)) {
return;
}
const length = collection.length;
for (let i = 0; i < length; ++i) {
const item = collection.get(i);
item.clusterShow = false;
if (
!item.show ||
(primitiveCluster._scene.mode === SceneMode.SCENE3D &&
!occluder.isPointVisible(item.position))
) {
continue;
}
const canClusterLabels =
primitiveCluster._clusterLabels && defined(item._labelCollection);
const canClusterBillboards =
primitiveCluster._clusterBillboards && defined(item.id._billboard);
const canClusterPoints =
primitiveCluster._clusterPoints && defined(item.id._point);
if (canClusterLabels && (canClusterPoints || canClusterBillboards)) {
continue;
}
const coord = item.computeScreenSpacePosition(scene);
if (!defined(coord)) {
continue;
}
points.push({
index: i,
collection: collection,
clustered: false,
coord: coord,
});
}
}
const pointBoundinRectangleScratch = new BoundingRectangle();
const totalBoundingRectangleScratch = new BoundingRectangle();
const neighborBoundingRectangleScratch = new BoundingRectangle();
function createDeclutterCallback(primitiveCluster) {
return function (amount) {
if ((defined(amount) && amount < 0.05) || !primitiveCluster.enabled) {
return;
}
const scene = primitiveCluster._scene;
const labelCollection = primitiveCluster._labelCollection;
const billboardCollection = primitiveCluster._billboardCollection;
const pointCollection = primitiveCluster._pointCollection;
if (
(!defined(labelCollection) &&
!defined(billboardCollection) &&
!defined(pointCollection)) ||
(!primitiveCluster._clusterBillboards &&
!primitiveCluster._clusterLabels &&
!primitiveCluster._clusterPoints)
) {
return;
}
let clusteredLabelCollection = primitiveCluster._clusterLabelCollection;
let clusteredBillboardCollection =
primitiveCluster._clusterBillboardCollection;
let clusteredPointCollection = primitiveCluster._clusterPointCollection;
if (defined(clusteredLabelCollection)) {
clusteredLabelCollection.removeAll();
} else {
clusteredLabelCollection = primitiveCluster._clusterLabelCollection = new LabelCollection(
{
scene: scene,
}
);
}
if (defined(clusteredBillboardCollection)) {
clusteredBillboardCollection.removeAll();
} else {
clusteredBillboardCollection = primitiveCluster._clusterBillboardCollection = new BillboardCollection(
{
scene: scene,
}
);
}
if (defined(clusteredPointCollection)) {
clusteredPointCollection.removeAll();
} else {
clusteredPointCollection = primitiveCluster._clusterPointCollection = new PointPrimitiveCollection();
}
const pixelRange = primitiveCluster._pixelRange;
const minimumClusterSize = primitiveCluster._minimumClusterSize;
const clusters = primitiveCluster._previousClusters;
const newClusters = [];
const previousHeight = primitiveCluster._previousHeight;
const currentHeight = scene.camera.positionCartographic.height;
const ellipsoid = scene.mapProjection.ellipsoid;
const cameraPosition = scene.camera.positionWC;
const occluder = new EllipsoidalOccluder(ellipsoid, cameraPosition);
const points = [];
if (primitiveCluster._clusterLabels) {
getScreenSpacePositions(
labelCollection,
points,
scene,
occluder,
primitiveCluster
);
}
if (primitiveCluster._clusterBillboards) {
getScreenSpacePositions(
billboardCollection,
points,
scene,
occluder,
primitiveCluster
);
}
if (primitiveCluster._clusterPoints) {
getScreenSpacePositions(
pointCollection,
points,
scene,
occluder,
primitiveCluster
);
}
let i;
let j;
let length;
let bbox;
let neighbors;
let neighborLength;
let neighborIndex;
let neighborPoint;
let ids;
let numPoints;
let collection;
let collectionIndex;
const index = new KDBush(points, getX, getY, 64, Int32Array);
if (currentHeight < previousHeight) {
length = clusters.length;
for (i = 0; i < length; ++i) {
const cluster = clusters[i];
if (!occluder.isPointVisible(cluster.position)) {
continue;
}
const coord = Billboard._computeScreenSpacePosition(
Matrix4.IDENTITY,
cluster.position,
Cartesian3.ZERO,
Cartesian2.ZERO,
scene
);
if (!defined(coord)) {
continue;
}
const factor = 1.0 - currentHeight / previousHeight;
let width = (cluster.width = cluster.width * factor);
let height = (cluster.height = cluster.height * factor);
width = Math.max(width, cluster.minimumWidth);
height = Math.max(height, cluster.minimumHeight);
const minX = coord.x - width * 0.5;
const minY = coord.y - height * 0.5;
const maxX = coord.x + width;
const maxY = coord.y + height;
neighbors = index.range(minX, minY, maxX, maxY);
neighborLength = neighbors.length;
numPoints = 0;
ids = [];
for (j = 0; j < neighborLength; ++j) {
neighborIndex = neighbors[j];
neighborPoint = points[neighborIndex];
if (!neighborPoint.clustered) {
++numPoints;
collection = neighborPoint.collection;
collectionIndex = neighborPoint.index;
ids.push(collection.get(collectionIndex).id);
}
}
if (numPoints >= minimumClusterSize) {
addCluster(cluster.position, numPoints, ids, primitiveCluster);
newClusters.push(cluster);
for (j = 0; j < neighborLength; ++j) {
points[neighbors[j]].clustered = true;
}
}
}
}
length = points.length;
for (i = 0; i < length; ++i) {
const point = points[i];
if (point.clustered) {
continue;
}
point.clustered = true;
collection = point.collection;
collectionIndex = point.index;
const item = collection.get(collectionIndex);
bbox = getBoundingBox(
item,
point.coord,
pixelRange,
primitiveCluster,
pointBoundinRectangleScratch
);
const totalBBox = BoundingRectangle.clone(
bbox,
totalBoundingRectangleScratch
);
neighbors = index.range(
bbox.x,
bbox.y,
bbox.x + bbox.width,
bbox.y + bbox.height
);
neighborLength = neighbors.length;
const clusterPosition = Cartesian3.clone(item.position);
numPoints = 1;
ids = [item.id];
for (j = 0; j < neighborLength; ++j) {
neighborIndex = neighbors[j];
neighborPoint = points[neighborIndex];
if (!neighborPoint.clustered) {
const neighborItem = neighborPoint.collection.get(
neighborPoint.index
);
const neighborBBox = getBoundingBox(
neighborItem,
neighborPoint.coord,
pixelRange,
primitiveCluster,
neighborBoundingRectangleScratch
);
Cartesian3.add(
neighborItem.position,
clusterPosition,
clusterPosition
);
BoundingRectangle.union(totalBBox, neighborBBox, totalBBox);
++numPoints;
ids.push(neighborItem.id);
}
}
if (numPoints >= minimumClusterSize) {
const position = Cartesian3.multiplyByScalar(
clusterPosition,
1.0 / numPoints,
clusterPosition
);
addCluster(position, numPoints, ids, primitiveCluster);
newClusters.push({
position: position,
width: totalBBox.width,
height: totalBBox.height,
minimumWidth: bbox.width,
minimumHeight: bbox.height,
});
for (j = 0; j < neighborLength; ++j) {
points[neighbors[j]].clustered = true;
}
} else {
addNonClusteredItem(item, primitiveCluster);
}
}
if (clusteredLabelCollection.length === 0) {
clusteredLabelCollection.destroy();
primitiveCluster._clusterLabelCollection = undefined;
}
if (clusteredBillboardCollection.length === 0) {
clusteredBillboardCollection.destroy();
primitiveCluster._clusterBillboardCollection = undefined;
}
if (clusteredPointCollection.length === 0) {
clusteredPointCollection.destroy();
primitiveCluster._clusterPointCollection = undefined;
}
primitiveCluster._previousClusters = newClusters;
primitiveCluster._previousHeight = currentHeight;
};
}
PrimitiveCluster.prototype._initialize = function (scene) {
this._scene = scene;
const cluster = createDeclutterCallback(this);
this._cluster = cluster;
var _t = null;
const _self = this;
this._removeEventListener = scene.camera.changed.addEventListener(function (amount) {
if (_t) {
clearTimeout(_t);
_t = null;
}
_t = setTimeout(() => {
cluster(amount);
}, _self._delay);
})
};
Object.defineProperties(PrimitiveCluster.prototype, {
/**
* Gets or sets whether clustering is enabled.
* @memberof PrimitiveCluster.prototype
* @type {Boolean}
*/
enabled: {
get: function () {
return this._enabled;
},
set: function (value) {
this._enabledDirty = value !== this._enabled;
this._enabled = value;
},
},
/**
* 设置防抖间隔降低处理频率
* @memberof PrimitiveCluster.prototype
* @type {Number}
*/
delay: {
get: function () {
return this._delay;
},
set: function (value) {
this._delay = value;
},
},
/**
* Gets or sets the pixel range to extend the screen space bounding box.
* @memberof PrimitiveCluster.prototype
* @type {Number}
*/
pixelRange: {
get: function () {
return this._pixelRange;
},
set: function (value) {
this._clusterDirty = this._clusterDirty || value !== this._pixelRange;
this._pixelRange = value;
},
},
/**
* Gets or sets the minimum number of screen space objects that can be clustered.
* @memberof PrimitiveCluster.prototype
* @type {Number}
*/
minimumClusterSize: {
get: function () {
return this._minimumClusterSize;
},
set: function (value) {
this._clusterDirty =
this._clusterDirty || value !== this._minimumClusterSize;
this._minimumClusterSize = value;
},
},
/**
* Gets the event that will be raised when a new cluster will be displayed. The signature of the event listener is {@link PrimitiveCluster.newClusterCallback}.
* @memberof PrimitiveCluster.prototype
* @type {Event<PrimitiveCluster.newClusterCallback>}
*/
clusterEvent: {
get: function () {
return this._clusterEvent;
},
},
/**
* Gets or sets whether clustering billboard entities is enabled.
* @memberof PrimitiveCluster.prototype
* @type {Boolean}
*/
clusterBillboards: {
get: function () {
return this._clusterBillboards;
},
set: function (value) {
this._clusterDirty =
this._clusterDirty || value !== this._clusterBillboards;
this._clusterBillboards = value;
},
},
/**
* Gets or sets whether clustering labels entities is enabled.
* @memberof PrimitiveCluster.prototype
* @type {Boolean}
*/
clusterLabels: {
get: function () {
return this._clusterLabels;
},
set: function (value) {
this._clusterDirty = this._clusterDirty || value !== this._clusterLabels;
this._clusterLabels = value;
},
},
/**
* Gets or sets whether clustering point entities is enabled.
* @memberof PrimitiveCluster.prototype
* @type {Boolean}
*/
clusterPoints: {
get: function () {
return this._clusterPoints;
},
set: function (value) {
this._clusterDirty = this._clusterDirty || value !== this._clusterPoints;
this._clusterPoints = value;
},
},
});
function createGetEntity(
collectionProperty,
CollectionConstructor,
unusedIndicesProperty,
entityIndexProperty
) {
return function (entity) {
let collection = this[collectionProperty];
if (!defined(this._collectionIndicesByEntity)) {
this._collectionIndicesByEntity = {};
}
let entityIndices = this._collectionIndicesByEntity[entity.id];
if (!defined(entityIndices)) {
entityIndices = this._collectionIndicesByEntity[entity.id] = {
billboardIndex: undefined,
labelIndex: undefined,
pointIndex: undefined,
};
}
if (defined(collection) && defined(entityIndices[entityIndexProperty])) {
return collection.get(entityIndices[entityIndexProperty]);
}
if (!defined(collection)) {
collection = this[collectionProperty] = new CollectionConstructor({
scene: this._scene,
});
}
let index;
let entityItem;
const unusedIndices = this[unusedIndicesProperty];
if (unusedIndices.length > 0) {
index = unusedIndices.pop();
entityItem = collection.get(index);
} else {
entityItem = collection.add();
index = collection.length - 1;
}
entityIndices[entityIndexProperty] = index;
const that = this;
Promise.resolve().then(function () {
that._clusterDirty = true;
});
return entityItem;
};
}
function removeEntityIndicesIfUnused(primitiveCluster, entityId) {
const indices = primitiveCluster._collectionIndicesByEntity[entityId];
if (
!defined(indices.billboardIndex) &&
!defined(indices.labelIndex) &&
!defined(indices.pointIndex)
) {
delete primitiveCluster._collectionIndicesByEntity[entityId];
}
}
/**
* Returns a new {@link Label}.
* @param {Entity} entity The entity that will use the returned {@link Label} for visualization.
* @returns {Label} The label that will be used to visualize an entity.
*
* @private
*/
PrimitiveCluster.prototype.getLabel = createGetEntity(
"_labelCollection",
LabelCollection,
"_unusedLabelIndices",
"labelIndex"
);
/**
* Removes the {@link Label} associated with an entity so it can be reused by another entity.
* @param {Entity} entity The entity that will uses the returned {@link Label} for visualization.
*
* @private
*/
PrimitiveCluster.prototype.removeLabel = function (entity) {
const entityIndices =
this._collectionIndicesByEntity &&
this._collectionIndicesByEntity[entity.id];
if (
!defined(this._labelCollection) ||
!defined(entityIndices) ||
!defined(entityIndices.labelIndex)
) {
return;
}
const index = entityIndices.labelIndex;
entityIndices.labelIndex = undefined;
removeEntityIndicesIfUnused(this, entity.id);
const label = this._labelCollection.get(index);
label.show = false;
label.text = "";
label.id = undefined;
this._unusedLabelIndices.push(index);
this._clusterDirty = true;
};
/**
* Returns a new {@link Billboard}.
* @param {Entity} entity The entity that will use the returned {@link Billboard} for visualization.
* @returns {Billboard} The label that will be used to visualize an entity.
*
* @private
*/
PrimitiveCluster.prototype.getBillboard = createGetEntity(
"_billboardCollection",
BillboardCollection,
"_unusedBillboardIndices",
"billboardIndex"
);
/**
* Removes the {@link Billboard} associated with an entity so it can be reused by another entity.
* @param {Entity} entity The entity that will uses the returned {@link Billboard} for visualization.
*
* @private
*/
PrimitiveCluster.prototype.removeBillboard = function (entity) {
const entityIndices =
this._collectionIndicesByEntity &&
this._collectionIndicesByEntity[entity.id];
if (
!defined(this._billboardCollection) ||
!defined(entityIndices) ||
!defined(entityIndices.billboardIndex)
) {
return;
}
const index = entityIndices.billboardIndex;
entityIndices.billboardIndex = undefined;
removeEntityIndicesIfUnused(this, entity.id);
const billboard = this._billboardCollection.get(index);
billboard.id = undefined;
billboard.show = false;
billboard.image = undefined;
this._unusedBillboardIndices.push(index);
this._clusterDirty = true;
};
/**
* Returns a new {@link Point}.
* @param {Entity} entity The entity that will use the returned {@link Point} for visualization.
* @returns {Point} The label that will be used to visualize an entity.
*
* @private
*/
PrimitiveCluster.prototype.getPoint = createGetEntity(
"_pointCollection",
PointPrimitiveCollection,
"_unusedPointIndices",
"pointIndex"
);
/**
* Removes the {@link Point} associated with an entity so it can be reused by another entity.
* @param {Entity} entity The entity that will uses the returned {@link Point} for visualization.
*
* @private
*/
PrimitiveCluster.prototype.removePoint = function (entity) {
const entityIndices =
this._collectionIndicesByEntity &&
this._collectionIndicesByEntity[entity.id];
if (
!defined(this._pointCollection) ||
!defined(entityIndices) ||
!defined(entityIndices.pointIndex)
) {
return;
}
const index = entityIndices.pointIndex;
entityIndices.pointIndex = undefined;
removeEntityIndicesIfUnused(this, entity.id);
const point = this._pointCollection.get(index);
point.show = false;
point.id = undefined;
this._unusedPointIndices.push(index);
this._clusterDirty = true;
};
function disableCollectionClustering(collection) {
if (!defined(collection)) {
return;
}
const length = collection.length;
for (let i = 0; i < length; ++i) {
collection.get(i).clusterShow = true;
}
}
function updateEnable(primitiveCluster) {
if (primitiveCluster.enabled) {
return;
}
if (defined(primitiveCluster._clusterLabelCollection)) {
primitiveCluster._clusterLabelCollection.destroy();
}
if (defined(primitiveCluster._clusterBillboardCollection)) {
primitiveCluster._clusterBillboardCollection.destroy();
}
if (defined(primitiveCluster._clusterPointCollection)) {
primitiveCluster._clusterPointCollection.destroy();
}
primitiveCluster._clusterLabelCollection = undefined;
primitiveCluster._clusterBillboardCollection = undefined;
primitiveCluster._clusterPointCollection = undefined;
disableCollectionClustering(primitiveCluster._labelCollection);
disableCollectionClustering(primitiveCluster._billboardCollection);
disableCollectionClustering(primitiveCluster._pointCollection);
}
/**
* Gets the draw commands for the clustered billboards/points/labels if enabled, otherwise,
* queues the draw commands for billboards/points/labels created for entities.
* @private
*/
PrimitiveCluster.prototype.update = function (frameState) {
if (!this.show) {
return;
}
// If clustering is enabled before the label collection is updated,
// the glyphs haven't been created so the screen space bounding boxes
// are incorrect.
let commandList;
if (
defined(this._labelCollection) &&
this._labelCollection.length > 0 &&
this._labelCollection.get(0)._glyphs.length === 0
) {
commandList = frameState.commandList;
frameState.commandList = [];
this._labelCollection.update(frameState);
frameState.commandList = commandList;
}
// If clustering is enabled before the billboard collection is updated,
// the images haven't been added to the image atlas so the screen space bounding boxes
// are incorrect.
if (
defined(this._billboardCollection) &&
this._billboardCollection.length > 0 &&
!defined(this._billboardCollection.get(0).width)
) {
commandList = frameState.commandList;
frameState.commandList = [];
this._billboardCollection.update(frameState);
frameState.commandList = commandList;
}
if (this._enabledDirty) {
this._enabledDirty = false;
updateEnable(this);
this._clusterDirty = true;
}
if (this._clusterDirty) {
this._clusterDirty = false;
this._cluster();
}
if (defined(this._clusterLabelCollection)) {
this._clusterLabelCollection.update(frameState);
}
if (defined(this._clusterBillboardCollection)) {
this._clusterBillboardCollection.update(frameState);
}
if (defined(this._clusterPointCollection)) {
this._clusterPointCollection.update(frameState);
}
if (defined(this._labelCollection)) {
this._labelCollection.update(frameState);
}
if (defined(this._billboardCollection)) {
this._billboardCollection.update(frameState);
}
if (defined(this._pointCollection)) {
this._pointCollection.update(frameState);
}
};
/**
* 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.
* <p>
* Unlike other objects that use WebGL resources, this object can be reused. For example, if a data source is removed
* from a data source collection and added to another.
* </p>
*/
PrimitiveCluster.prototype.destroy = function () {
this._labelCollection =
this._labelCollection && this._labelCollection.destroy();
this._billboardCollection =
this._billboardCollection && this._billboardCollection.destroy();
this._pointCollection =
this._pointCollection && this._pointCollection.destroy();
this._clusterLabelCollection =
this._clusterLabelCollection && this._clusterLabelCollection.destroy();
this._clusterBillboardCollection =
this._clusterBillboardCollection &&
this._clusterBillboardCollection.destroy();
this._clusterPointCollection =
this._clusterPointCollection && this._clusterPointCollection.destroy();
if (defined(this._removeEventListener)) {
this._removeEventListener();
this._removeEventListener = undefined;
}
this._labelCollection = undefined;
this._billboardCollection = undefined;
this._pointCollection = undefined;
this._clusterBillboardCollection = undefined;
this._clusterLabelCollection = undefined;
this._clusterPointCollection = undefined;
this._collectionIndicesByEntity = undefined;
this._unusedLabelIndices = [];
this._unusedBillboardIndices = [];
this._unusedPointIndices = [];
this._previousClusters = [];
this._previousHeight = undefined;
this._enabledDirty = false;
this._pixelRangeDirty = false;
this._minimumClusterSizeDirty = false;
return undefined;
};
/**
* A event listener function used to style clusters.
* @callback PrimitiveCluster.newClusterCallback
*
* @param {Entity[]} clusteredEntities An array of the entities contained in the cluster.
* @param {Object} cluster An object containing the Billboard, Label, and Point
* primitives that represent this cluster of entities.
* @param {Billboard} cluster.billboard
* @param {Label} cluster.label
* @param {PointPrimitive} cluster.point
*
* @example
* // The default cluster values.
* dataSource.clustering.clusterEvent.addEventListener(function(entities, cluster) {
* cluster.label.show = true;
* cluster.label.text = entities.length.toLocaleString();
* });
*/
export default PrimitiveCluster;