*** Backup Mirror *** The web interface and JSON api for the ConnectedHumber Air Quality Monitoring Project. https://github.com/ConnectedHumber/Air-Quality-Web
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"use strict";
import HeatmapOverlay from 'leaflet-heatmap';
import Config from './Config.mjs';
import GetFromUrl from './Helpers/GetFromUrl.mjs';
import { RenderGradient } from './Helpers/GradientHelpers.mjs';
import Guage from './Guage.mjs';
class LayerHeatmap {
/**
* Creates a new heatmap manager wrapper class fort he given map.
* @param {L.Map} in_map The leaflet map to attach to.
*/
constructor(in_map, in_device_data) {
this.map = in_map;
this.device_data = in_device_data;
this.overlay_config = {
radius: Config.heatmap.blob_radius,
minOpacity: 0.5,
maxOpacity: 0.8,
scaleRadius: true,
useLocalExtrema: false,
latField: "latitude",
lngField: "longitude",
valueField: "value",
gradient: { } // Automatically filled in further down
};
this.layer = new L.LayerGroup();
this.map.addLayer(this.layer);
this.recreate_overlay();
// Custom configuration directives to apply based on the reading type displayed.
this.reading_type_configs = {
"PM25": {
/*
* Range Midpoint Name Colour
* 0 - 11 5.5 Low 1 #9CFF9C
* 12 - 23 17.5 Low 2 #31FF00
* 24 - 35 29.5 Low 3 #31CF00
* 36 - 41 38.5 Moderate 1 #FFFF00
* 42 - 47 44.5 Moderate 2 #FFCF00
* 48 - 53 50.5 Moderate 3 #FF9A00
* 54 - 58 56 High 1 #FF6464
* 59 - 64 61.5 High 2 #FF0000
* 65 - 70 67.5 High 3 #990000
* 71+ n/a Very high #CE30FF
*/
max: 75,
gradient: {
"0": "#9CFF9C", "5.5": "#9CFF9C", // Low 1
"17.5": "#31FF00", // Low 2
"29.5": "#31CF00", // Low 3
"38.5": "#FFFF00", // Moderate 1
"44.5": "#FFCF00", // Moderate 2
"50.5": "#FF9A00", // Moderate 3
"56": "#FF6464", // High 1
"61.5": "#FF0000", // High 2
"67.5": "#990000", // High 3
"72.5": "#CE30FF", "75": "#CE30FF", // Very high
}
},
"PM10": {
/*
* Range Midpoint Name Colour
* 0-16 8 Low 1 #9CFF9C
* 17-33 25 Low 2 #31FF00
* 34-50 42 Low 3 #31CF00
* 51-58 54.5 Moderate 1 #FFFF00
* 59-66 62.5 Moderate 2 #FFCF00
* 67-75 71 Moderate 3 #FF9A00
* 76-83 79.5 High 1 #FF6464
* 84-91 87.5 High 2 #FF0000
* 92-100 96 High 3 #990000
* 101 105.5 Very High #CE30FF
*/
max: 110,
gradient: {
"0": "#9CFF9C", "8": "#9CFF9C", // Low 1
"25": "#31FF00", // Low 2
"42": "#31CF00", // Low 3
"54.5": "#FFFF00", // Moderate 1
"62.5": "#FFCF00", // Moderate 2
"71": "#FF9A00", // Moderate 3
"79.5": "#FF6464", // High 1
"87.5": "#FF0000", // High 2
"96": "#990000", // High 3
"105.5": "#CE30FF", "110": "#CE30FF", // Very high
}
},
"humidity": {
max: 100,
gradient: {
"0": "hsla(176, 77%, 40%, 0)",
"50": "hsl(176, 77%, 40%)",
"100": "blue"
}
},
"temperature": {
max: 40,
gradient: {
"0": "blue",
"5": "cyan",
"15": "green",
"20": "yellow",
"30": "orange",
"40": "red"
}
},
"pressure": {
max: 1100,
gradient: {
"870": "purple",
"916": "red",
"962": "orange",
"1008": "yellow",
"1054": "green",
"1100": "#BFED91"
}
}
};
this.guage = new Guage(document.getElementById("canvas-guage"));
this.reading_cache = new Map();
}
/**
* Re-creates the heatmap overlay layer.
* Needed sometimes internally to work around an annoying bug.
*/
recreate_overlay() {
if(typeof this.heatmap != "undefined")
this.layer.removeLayer(this.heatmap);
this.heatmap = new HeatmapOverlay(this.overlay_config);
this.layer.addLayer(this.heatmap);
}
/**
* Sets the display data to the given array of data points.
* @param {object[]} readings_list The array of data points to display.
*/
set_data(readings_list) {
// Substitute in the device locations
for(let reading of readings_list) {
let device_info = this.device_data.get_by_id(reading.device_id);
reading.latitude = device_info.latitude;
reading.longitude = device_info.longitude;
}
let data_object = {
max: 0,
data: readings_list
};
if(typeof this.reading_type_configs[this.reading_type] != "undefined")
data_object.max = this.reading_type_configs[this.reading_type].max;
else
data_object.max = readings_list.reduce((prev, next) => next.value > prev ? next.value : prev, 0);
console.log("[map/heatmap] Displaying", this.reading_type, data_object);
this.heatmap.setData(data_object);
}
/**
* Updates the heatmap with data for the specified datetime & reading type,
* fetching new data if necessary.
* @param {Date} datetime The datetime to display.
* @param {string} reading_type The reading type to display data for.
* @return {Promise} A promise that resolves when the operation is completed.
*/
async update_data(datetime, reading_type) {
if(!(datetime instanceof Date))
throw new Error("Error: 'datetime' must be an instance of Date.");
if(typeof reading_type != "string")
throw new Error("Error: 'reading_type' must be a string.");
this.datetime = datetime;
this.reading_type = reading_type;
console.log("[map/heatmap] Updating values to", this.reading_type, "@", this.datetime);
if(typeof this.reading_type_configs[this.reading_type] != "undefined") {
this.overlay_config.gradient = RenderGradient(
this.reading_type_configs[this.reading_type].gradient,
this.reading_type_configs[this.reading_type].max
);
console.log("[map/heatmap] Gradient is now", this.overlay_config.gradient);
this.recreate_overlay();
}
else {
delete this.overlay_config.gradient;
}
this.guage.set_spec(
this.reading_type_configs[this.reading_type].gradient,
this.reading_type_configs[this.reading_type].max
);
this.guage.render();
try {
this.set_data(await this.fetch_data(this.datetime, this.reading_type));
} catch(error) {
console.log(error);
alert(error);
}
}
/**
* Fetches & decodes data for the given datetime and the current reading type.
* @param {Date} datetime The Date to fetch data for.
* @param {string} reading_type The reading type code to fetch data for.
* @return {Promise} The requested data array, as the return value of a promise
*/
async fetch_data(datetime, reading_type) {
let cache_key = `${reading_type}|${datetime.toISOString()}`;
let result = this.reading_cache.get(cache_key);
if(typeof result == "undefined") {
result = JSON.parse(await GetFromUrl(
`${Config.api_root}?action=fetch-data&datetime=${encodeURIComponent(datetime.toISOString())}&reading_type=${encodeURIComponent(reading_type)}`
));
this.prune_cache(100);
this.reading_cache.set(cache_key, { data: result, inserted: new Date() });
}
else
result = result.data;
return result;
}
/**
* Prunes the reading cache, leaving at most newest_count items behind.
* The items inserted first are deleted first.
* @param {Number} newest_count The numebr of items to leave behind in the cache.
* @returns {Number} The number of items deleted from the cache.
*/
prune_cache(newest_count) {
let items = [];
for(let next_key of this.reading_cache) {
let cache_item = this.reading_cache.get(next_key);
if(typeof cache_item == "undefined") {
this.reading_cache.delete(cache_item);
continue;
}
items.push({
key: next_key,
date: cache_item.inserted
});
}
items.sort((a, b) => a.date - b.date);
let deleted = 0;
for(let i = 0; i < items.length - newest_count; i++) {
this.reading_cache.delete(this.items[i].key);
deleted++;
}
return deleted;
}
/**
* Whether the reading cache contains data for the given datetime & reading type.
* @param {Date} datetime The datetime to check.
* @param {string} reading_type The reading type code to check.
* @return {Boolean} Whether the reading cache contains data for the requested datetime & reading type.
*/
is_data_cached(datetime, reading_type) {
let cache_key = Symbol.for(`${reading_type}|${datetime.toISOString()}`);
return this.reading_cache.has(cache_key);
}
async update_reading_type(reading_type) {
await this.update_data(
this.datetime,
reading_type
);
}
async refresh_display() {
await this.update_data(
this.datetime,
this.reading_type
);
}
}
export default LayerHeatmap;