const THREE = require('three');
const markerImage = new Image(128, 128);
markerImage.src = require("../assets/mapMarkerOrange.svg");
const texture = new THREE.Texture();
texture.image = markerImage;
texture.needsUpdate = true;
const size = [0.02, 0.03, 1];
const spriteMaterial = new THREE.SpriteMaterial({
map: texture,
alphaTest: 0.5,
transparent: true,
depthTest: false,
depthWrite: false,
sizeAttenuation: false
});
const createNewSpriteText = require('../utilities').createNewSpriteText;
/**
* A special graphics type with a tear drop shape.
* It forms a cluster a marker based on distance.
*
* @class
* @author Alan Wu
* @return {Marker}
*/
const MarkerCluster = function(sceneIn) {
(require('./zincObject').ZincObject).call(this);
this.texture = texture;
let sprite = undefined;
let scene = sceneIn;
this.morph = new THREE.Group();
this.group = this.morph;
this.isMarkerCluster = true;
let enabled = true;
let sprites = [];
this.markers = {};
let _v21 = new THREE.Vector2();
let _v22 = new THREE.Vector2();
let _radius = 0.1;
let start = Date.now();
/**
* Set the size of the marker.
*
* @param {Number} size - size to be set.
*/
this.setSpriteSize = size => {
sprite.scale.set(0.015, 0.02, 1);
sprite.scale.multiplyScalar(size);
}
this.clear = () => {
this.group.clear();
this.markers = {};
}
/**
* Clean up this object,
*/
this.dispose = () => {
this.clear();
if (this.morph) {
this.morph.clear();
}
}
const createNewSprite = (index) => {
//Group is needed to set the position after scaling
//the sprite
const localGroup = new THREE.Group();
const sprite = new THREE.Sprite(spriteMaterial);
sprite.clusterIndex = index;
sprite.center.set(0.5, 0);
sprite.position.set(0, 0, 0);
sprite.renderOrder = 10000;
sprite.scale.set(size[0], size[1], size[2]);
sprite.userData = this;
localGroup.add(sprite);
this.group.add(localGroup);
return {
"group": localGroup,
"marker": sprite,
"label": undefined,
"number": 0,
"min": [0, 0, 0],
"max": [1, 1, 1],
};
}
const activateSpriteForCluster = (sprite, cluster, number) => {
sprite.group.visible = true;
sprite.group.position.set(
cluster.coords[0], cluster.coords[1], cluster.coords[2]
);
if (sprite.label === undefined || (number !== sprite.number)) {
if (sprite.label) {
sprite.group.remove(sprite.label);
sprite.label.material.map.dispose();
sprite.label.material.dispose();
}
sprite.label = createNewSpriteText(number, 0.012, "black", "Asap", 120, 700);
sprite.number = number;
sprite.group.add(sprite.label);
}
sprite.min = cluster.min;
sprite.max = cluster.max;
}
const drawClusters = (clusters) => {
let currentIndex = 0;
clusters.forEach((cluster) => {
const length = cluster.members.length;
let number = 0;
if (length === 1) {
cluster.members[0].setVisibility(true);
} else {
cluster.members.forEach((marker) => {
number += marker.getNumber();
marker.setVisibility(false);
});
if (!sprites[currentIndex]) {
sprites.push(createNewSprite(currentIndex));
}
activateSpriteForCluster(sprites[currentIndex], cluster, number);
currentIndex++;
}
});
for (currentIndex; currentIndex < sprites.length; currentIndex++) {
sprites[currentIndex].group.visible = false;
}
}
//Get clusters based on the ndc coordinate for each cluster.
const getCluster = (markersObj, clusters) => {
let first = true;
let newCluster = {members: [], coords: [0,0,0], min: [0, 0, 0], max: [1, 1, 1]};
let dist = 0
for (let prop in markersObj) {
if (first) {
_v21.set(markersObj[prop].ndc.x, markersObj[prop].ndc.y);
this._b1.setFromPoints([markersObj[prop].morph.position]);
first = false;
newCluster.members.push(markersObj[prop]);
newCluster.coords = [
markersObj[prop].morph.position.x,
markersObj[prop].morph.position.y,
markersObj[prop].morph.position.z,
]
clusters.push(newCluster);
delete markersObj[prop];
} else {
_v22.set(markersObj[prop].ndc.x, markersObj[prop].ndc.y);
dist = _v21.distanceTo(_v22);
if (_radius > dist) {
newCluster.members.push(markersObj[prop]);
this._b1.expandByPoint(markersObj[prop].morph.position);
delete markersObj[prop];
}
}
}
newCluster.min = [this._b1.min.x, this._b1.min.y, this._b1.min.z];
newCluster.max = [this._b1.max.x, this._b1.max.y, this._b1.max.z];
//this._b1.getCenter(this._v2);
//newCluster.coords = [this._v2.x, this._v2.y, this._v2.z];
//The following will not be called if there is object left and
//thus finishing clustering
if (first !== true) {
getCluster(markersObj, clusters);
}
}
this.calculate = () => {
if (enabled) {
const current = Date.now();
if ((current - start) > 500) {
let clusters = [];
getCluster({...this.markers}, clusters);
drawClusters(clusters);
start = Date.now();
this.markerUpdateRequired = false;
}
}
}
this.isEnabled = () => {
return enabled;
}
/**
* Enable and visualise the marker.
*/
this.enable = () => {
enabled = true;
this.morph.visible = true;
}
/**
* Disable and hide the marker.
*/
this.disable = () => {
enabled = false;
this.morph.visible = false;
//turn all markers back on
for (let prop in this.markers) {
if (this.markers[prop]?.isMarker &&
this.markers[prop].isEnabled()) {
this.markers[prop].setVisibility(true);
}
}
}
this.zoomToCluster = (index) => {
if (index !== undefined && index > -1) {
this._v1.set(...sprites[index].min);
this._v2.set(...sprites[index].max);
if (Math.abs(this._v1.distanceTo(this._v2) > 0.0)) {
this._b1.set(this._v1, this._v2);
scene.translateBoundingBoxToCameraView(this._b1, 3, 300);
this.markerUpdateRequired = true;
return true;
}
}
return false;
}
this.clusterIsVisible = (index) => {
if (index !== undefined && index > -1) {
if (sprites[index]) {
return sprites[index].group?.visible;
}
}
return false;
}
}
MarkerCluster.prototype = Object.create((require('./zincObject').ZincObject).prototype);
exports.MarkerCluster = MarkerCluster;