226 lines
6.3 KiB
JavaScript
226 lines
6.3 KiB
JavaScript
"use strict";
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import HeatmapOverlay from 'leaflet-heatmap';
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import Config from './Config.mjs';
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import GetFromUrl from './Helpers/GetFromUrl.mjs';
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class LayerHeatmap {
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/**
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* Creates a new heatmap manager wrapper class fort he given map.
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* @param {L.Map} in_map The leaflet map to attach to.
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*/
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constructor(in_map) {
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this.map = in_map;
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this.overlay_config = {
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radius: Config.heatmap.blob_radius,
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minOpacity: 0.5,
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maxOpacity: 0.8,
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scaleRadius: true,
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useLocalExtrema: false,
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latField: "latitude",
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lngField: "longitude",
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valueField: "value",
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gradient: {
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// 0 to 35 low (green), 36 to 53 moderate (amber) 54 to 70 high (red) and above 71 (purple)
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0.233: "green",
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0.593: "orange",
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0.827: "red",
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1: "purple"
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}
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};
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this.layer = new L.LayerGroup();
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this.map.addLayer(this.layer);
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this.recreate_overlay();
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// Custom configuration directives to apply based on the reading type displayed.
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this.reading_type_configs = {
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"PM25": {
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// 0 to 35 low (green), 36 to 53 moderate (amber) 54 to 70 high (red) and above 71 (purple)
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max: 75,
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gradient: {
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"0": "hsla(111, 76%, 42%, 0.00)",
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"0.233": "hsl(111, 76%, 42%)", // green
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"0.593": "orange",
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"0.827": "red",
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"1": "purple"
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}
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},
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"PM10": {
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// 0 to 50 low (green) 51 to75 moderate (amber) 76 to 100 high (red) and more than 100 very high (purple)
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max: 100,
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gradient: {
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"0": "hsla(111, 76%, 42%, 0)",
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"0.45": "hsl(111, 76%, 42%)", // green
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"0.573": "orange",
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"0.8": "red",
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"1": "purple"
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}
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},
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"humidity": {
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max: 100,
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gradient: {
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"0": "hsla(176, 77%, 40%, 0)",
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"0.5": "hsl(176, 77%, 40%)",
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"1": "blue"
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}
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},
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"temperature": {
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max: 40,
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gradient: {
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"-0.25": "blue",
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"0.25": "cyan",
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"0.375": "green",
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"0.5": "yellow",
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"0.75": "orange",
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"1": "red"
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}
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}
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};
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this.reading_cache = new Map();
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}
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/**
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* Re-creates the heatmap overlay layer.
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* Needed sometimes internally to work around an annoying bug.
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*/
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recreate_overlay() {
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if(typeof this.heatmap != "undefined")
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this.layer.removeLayer(this.heatmap);
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this.heatmap = new HeatmapOverlay(this.overlay_config);
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this.layer.addLayer(this.heatmap);
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}
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/**
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* Sets the display data to the given array of data points.
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* @param {object[]} readings_list The array of data points to display.
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*/
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set_data(readings_list) {
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let data_object = {
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max: 0,
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data: readings_list
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};
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if(typeof this.reading_type_configs[this.reading_type] != "undefined")
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data_object.max = this.reading_type_configs[this.reading_type].max;
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else
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data_object.max = readings_list.reduce((prev, next) => next.value > prev ? next.value : prev, 0);
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console.log("[map/heatmap] Displaying", this.reading_type, data_object);
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this.heatmap.setData(data_object);
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}
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/**
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* Updates the heatmap with data for the specified datetime & reading type,
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* fetching new data if necessary.
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* @param {Date} datetime The datetime to display.
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* @param {string} reading_type The reading type to display data for.
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* @return {Promise} A promise that resolves when the operation is completed.
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*/
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async update_data(datetime, reading_type) {
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if(!(datetime instanceof Date))
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throw new Error("Error: 'datetime' must be an instance of Date.");
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if(typeof reading_type != "string")
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throw new Error("Error: 'reading_type' must be a string.");
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this.datetime = datetime;
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this.reading_type = reading_type;
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console.log("[map/heatmap] Updating values to", this.reading_type, "@", this.datetime);
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if(typeof this.reading_type_configs[this.reading_type] != "undefined") {
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this.overlay_config.gradient = this.reading_type_configs[this.reading_type].gradient;
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console.log("[map/heatmap] Gradient is now", this.overlay_config.gradient);
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this.recreate_overlay();
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}
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else {
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delete this.overlay_config.gradient;
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}
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try {
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this.set_data(await this.fetch_data(this.datetime, this.reading_type));
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} catch(error) {
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console.log(error);
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alert(error);
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}
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}
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/**
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* Fetches & decodes data for the given datetime and the current reading type.
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* @param {Date} datetime The Date to fetch data for.
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* @param {string} reading_type The reading type code to fetch data for.
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* @return {Promise} The requested data array, as the return value of a promise
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*/
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async fetch_data(datetime, reading_type) {
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let cache_key = `${reading_type}|${datetime.toISOString()}`;
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let result = this.reading_cache.get(cache_key);
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if(typeof result == "undefined") {
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result = JSON.parse(await GetFromUrl(
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`${Config.api_root}?action=fetch-data&datetime=${encodeURIComponent(datetime.toISOString())}&reading_type=${encodeURIComponent(reading_type)}`
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));
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this.prune_cache(100);
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this.reading_cache.set(cache_key, { data: result, inserted: new Date() });
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}
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else
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result = result.data;
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return result;
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}
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/**
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* Prunes the reading cache, leaving at most newest_count items behind.
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* The items inserted first are deleted first.
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* @param {Number} newest_count The numebr of items to leave behind in the cache.
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* @returns {Number} The number of items deleted from the cache.
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*/
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prune_cache(newest_count) {
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let items = [];
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for(let next_key of this.reading_cache) {
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let cache_item = this.reading_cache.get(next_key);
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if(typeof cache_item == "undefined") {
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this.reading_cache.delete(cache_item);
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continue;
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}
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items.push({
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key: next_key,
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date: cache_item.inserted
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});
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}
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items.sort((a, b) => a.date - b.date);
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let deleted = 0;
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for(let i = 0; i < items.length - newest_count; i++) {
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this.reading_cache.delete(this.items[i].key);
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deleted++;
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}
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return deleted;
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}
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/**
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* Whether the reading cache contains data for the given datetime & reading type.
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* @param {Date} datetime The datetime to check.
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* @param {string} reading_type The reading type code to check.
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* @return {Boolean} Whether the reading cache contains data for the requested datetime & reading type.
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*/
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is_data_cached(datetime, reading_type) {
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let cache_key = Symbol.for(`${reading_type}|${datetime.toISOString()}`);
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return this.reading_cache.has(cache_key);
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}
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async update_reading_type(reading_type) {
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await this.update_data(
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this.datetime,
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reading_type
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);
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}
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}
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export default LayerHeatmap;
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