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twentyfour-hours-clock.js
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class TwentyfourHourClock extends HTMLElement {
static get observedAttributes() {
return ["datetime", "longitude", "latitude", "frequency", "twilight-degree", "width", "height"];
}
constructor() {
var _a, _b, _c, _d, _e;
super();
this._width = 256;
this._height = 256;
this._twilightDegree = -6;
this.interval = 1000;
this.elements = {
style: document.createElement("style"),
svg: document.createElement("span"),
};
this.ts = new Date().getTime();
if (this.getAttribute("longitude") === "auto" || this.getAttribute("latitude") === "auto") {
this._latitude = undefined;
this._longitude = undefined;
navigator.geolocation.getCurrentPosition((pos) => {
const crd = pos.coords;
console.log(crd);
this._latitude = crd.latitude;
this._longitude = crd.longitude;
this.drawNewDay();
});
}
else {
this._longitude = (_a = this.getAttributeNumerical("longitude")) !== null && _a !== void 0 ? _a : this._longitude;
this._latitude = (_b = this.getAttributeNumerical("latitude")) !== null && _b !== void 0 ? _b : this._latitude;
}
this._width = (_c = this.getAttributeNumerical("width")) !== null && _c !== void 0 ? _c : this._width;
this._height = (_d = this.getAttributeNumerical("height")) !== null && _d !== void 0 ? _d : this._height;
this._twilightDegree = (_e = this.getAttributeNumerical("twilight-degree")) !== null && _e !== void 0 ? _e : this._twilightDegree;
const dt = this.getAttribute("datetime");
this._datetime = dt ? new Date(dt) : new Date();
this.sunState =
this._longitude !== undefined && this._latitude !== undefined
? new TwentyfourSun(this._longitude, this._latitude, this._datetime, 0)
: undefined;
this.draw();
let shadowRoot = this.attachShadow({ mode: "open" });
shadowRoot.appendChild(this.elements.style);
shadowRoot.appendChild(this.elements.svg);
}
connectedCallback() {
var _a;
// Start timer
this.frequency = (_a = this.getAttributeNumerical("frequency")) !== null && _a !== void 0 ? _a : 1000 / this.interval;
}
disconnectedCallback() {
this.intervalTimer && clearInterval(this.intervalTimer);
}
attributeChangedCallback(attrName, oldValue, newValue) {
if (oldValue === newValue) {
return;
}
switch (attrName) {
case "datetime":
this.datetime = new Date(newValue);
break;
case "frequency":
this.frequency = Number(newValue);
break;
case "twilight-degree":
this.twilightDegree = Number(newValue);
break;
case "longitude":
this.longitude = Number(newValue);
break;
case "latitude":
this.latitude = Number(newValue);
break;
case "width":
this.width = Number(newValue);
break;
case "height":
this.height = Number(newValue);
break;
}
}
set datetime(datetime) {
this._datetime = datetime;
// no reflection to attribute
this.drawNewDay();
}
get datetime() {
return this._datetime;
}
set frequency(frequency) {
// no reflection to attribute
this.elements.svg.querySelector("#watchhand-seconds").style.opacity =
frequency < 1 ? "0" : "100";
this.interval = 1000 / Math.round(frequency);
this.intervalTimer && clearInterval(this.intervalTimer);
if (frequency > 0) {
this.intervalTimer = setInterval(() => {
this.rotateWatchhands();
}, this.interval);
}
}
get frequency() {
return 1000 / this.interval;
}
set twilightDegree(twilightDegree) {
this._twilightDegree = twilightDegree;
// no reflection to attribute
this.drawNewDay();
}
get twilightDegree() {
return this._twilightDegree;
}
set longitude(longitude) {
this._longitude = longitude;
// no reflection to attribute
this.drawNewDay();
}
get longitude() {
return this._longitude;
}
get longitudeString() {
if (this._longitude === undefined || isNaN(this._longitude)) {
return "";
}
let long = this._longitude > 0 ? "E" : "W";
long += Math.floor(Math.abs(this._longitude)).toFixed().padStart(3, "0");
long += "°";
long += Math.abs((this._longitude % 1) * 60)
.toFixed(2)
.padStart(5, "0");
long += "′";
return long;
}
set latitude(latitude) {
this._latitude = latitude;
// no reflection to attribute
this.drawNewDay();
}
get latitude() {
return this._latitude;
}
get latitudeString() {
if (this._latitude === undefined || isNaN(this._latitude)) {
return "";
}
let lat = this._latitude > 0 ? "N" : "S";
lat += Math.floor(Math.abs(this._latitude)).toFixed().padStart(2, "0");
lat += "°";
lat += Math.abs((this._latitude % 1) * 60)
.toFixed(2)
.padStart(5, "0");
lat += "′";
return lat;
}
set width(width) {
this._width = width;
this.draw();
}
get width() {
return this._width;
}
set height(height) {
this._height = height;
this.draw();
}
get height() {
return this._height;
}
draw() {
this.elements.style.innerHTML = this.getStyle();
this.elements.svg.innerHTML = this.getSvg();
}
getAttributeNumerical(attrName) {
const attr = this.getAttribute(attrName);
return attr !== null ? Number(attr) : null;
}
getStyle() {
const leUnit = this.lengthStroke;
return `
:host {
display: inline-block;
--font-family: sans-serif;
--color-background: black;
--color-foreground: white;
--color-watchhand: orange;
--color-night: #0f396c;
--color-twilight: #1d6fd3;
--color-day: #a1c5f2;
--stroke-width: ${leUnit / 5}px;
--stroke-width-watchhand: ${leUnit / 2.5}px;
--stroke-width-daylight: ${leUnit / 2.5}px;
}
svg {
fill: var(--color-background);
color: var(--color-foreground);
stroke-linecap: round;
stroke-linejoin: round;
width: 100%;
height: auto;
}
line, polyline, circle {
stroke: currentColor;
stroke-width: var(--stroke-width);
fill: transparent;
}
.light {
stroke-width: var(--stroke-width-daylight);
stroke-linecap: butt;
}
.light-night { stroke: var(--color-night); }
.light-dusk, .light-dawn { stroke: var(--color-twilight); }
.light-day { stroke: var(--color-day); }
#watchhand-hours, #watchhand-minutes,
#watchhand-hours-utc {
color: var(--color-watchhand);
stroke-width: var(--stroke-width-watchhand);
}
#watchhand-hours-utc {
stroke: none;
fill: currentColor;
}
text, polygon {
fill: currentColor;
paint-order: stroke;
stroke-width: var(--stroke-width-watchhand);
stroke: var(--color-background);
stroke-opacity: 0.5;
font-size: ${leUnit * 2}px;
font-family: var(--font-family);
}
text.small {
font-size: ${leUnit * 1.5}px;
}
.secondary {
${leUnit <= 2.5 ? "display: none" : ""}
}
.tertiarty {
${leUnit <= 3.5 ? "display: none" : ""}
}
`;
}
getSvg() {
const center = this.center;
const lengthStroke = this.lengthStroke;
const lengthStrokePrimary = this.lengthStrokePrimary;
const radiusMinutes = center.y - this.radiusMinutes;
const radiusHours = center.y - this.radiusHours;
let svg = `<svg width="${this.width}" height="${this.height}" version="1.1" viewBox="0 0 ${this.width} ${this.height}" xmlns="http://www.w3.org/2000/svg" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">`;
svg += `<rect x="0" y="0" width="${this.width}" height="${this.height}"></rect>`;
svg += `<g inkscape:groupmode="layer" inkscape:label="Sun state disc" id="sunstate">`;
svg += this.getSvgCircle();
svg += `</g>`;
svg += `<g inkscape:groupmode="layer" inkscape:label="Watchhands">`;
svg += `<line id="watchhand-seconds" x1="${center.x}" y1="${center.y}" x2="${center.x}" y2="${radiusMinutes + lengthStroke * 1.5}" transform-origin="${center.x} ${center.y}" transform="rotate(${this.angleSeconds})" />`;
svg += `<line id="watchhand-minutes" x1="${center.x}" y1="${center.y}" x2="${center.x}" y2="${radiusMinutes + lengthStroke * 2.4}" transform-origin="${center.x} ${center.y}" transform="rotate(${this.angleMinutes})" />`;
svg += `<line id="watchhand-hours" x1="${center.x}" y1="${center.y}" x2="${center.x}" y2="${radiusHours + lengthStroke * 2.4}" transform-origin="${center.x} ${center.y}" transform="rotate(${this.angleHours})" />`;
svg += `<circle id="watchhand-hours-utc" cx="${center.x}" cy="${radiusHours + lengthStroke * 2.4}" r="${lengthStroke / 2.5}" transform-origin="${center.x} ${center.y}" transform="rotate(${this.angleHoursUtc})" />`;
svg += `</g>`;
svg += `<g inkscape:groupmode="layer" inkscape:label="Minutes">`;
svg += `<circle cx="${center.x}" cy="${center.y}" r="${this.radiusMinutes}" />`;
for (let minutes = 0; minutes < 60; minutes++) {
const angle = minutes * 6;
const primary = minutes % 5 === 0;
svg += `<line x1="${center.x}" y1="${radiusMinutes}" x2="${center.x}" y2="${radiusMinutes + (primary ? lengthStrokePrimary : lengthStroke)}" transform="rotate(${angle} ${center.x} ${center.y})" class="${primary ? "primary" : "secondary"}" />`;
if (minutes === 0) {
svg += `<polygon points="${center.x - lengthStrokePrimary * 0.66},${radiusMinutes + lengthStrokePrimary} ${center.x},${radiusMinutes + lengthStrokePrimary + lengthStrokePrimary} ${center.x + lengthStrokePrimary * 0.66},${radiusMinutes + lengthStrokePrimary}" />`;
}
else if (primary) {
svg += `<text x="${center.x}" y="${radiusMinutes + lengthStrokePrimary + lengthStrokePrimary}" text-anchor="middle" transform="rotate(${angle} ${center.x} ${center.y})" class="${minutes % 15 === 0 ? "" : "secondary"}">${minutes.toFixed().padStart(2, "0")}</text>`;
}
}
svg += `</g>`;
svg += `<g inkscape:groupmode="layer" inkscape:label="Hours">`;
for (let hours = 0; hours < 24; hours += 1) {
const angle = hours * 15 + 180;
const primary = hours % 3 === 0;
svg += `<line x1="${center.x}" y1="${radiusHours + (hours === 12 ? -7 : 0)}" x2="${center.x}" y2="${radiusHours + (primary ? lengthStrokePrimary : lengthStroke)}" transform="rotate(${angle} ${center.x} ${center.y})" class="${primary ? "primary" : ""}" />`;
if (primary) {
svg += `<text x="${center.x}" y="${radiusHours + lengthStrokePrimary + lengthStrokePrimary}" text-anchor="middle" transform="rotate(${angle} ${center.x} ${center.y})" class="${hours % 6 === 0 ? "" : "secondary"}">${hours.toFixed().padStart(2, "0")}</text>`;
}
}
svg += `</g>`;
svg += `<g inkscape:groupmode="layer" inkscape:label="Extra information">`;
/*svg += `<text id="utc" class="tertiarty" x="${center.x}" y="${
center.y - lengthStrokePrimary
}" text-anchor="middle">UTC ${this.getTimezoneOffset()}</text>`;*/
svg += `<text id="lon" class="tertiarty small" x="${center.x}" y="${center.y - lengthStrokePrimary * 1}" text-anchor="middle">${this.longitudeString}</text>`;
svg += `<text id="lat" class="tertiarty small" x="${center.x}" y="${center.y - lengthStrokePrimary * 2}" text-anchor="middle">${this.latitudeString}</text>`;
svg += `<text id="date" class="tertiarty" x="${center.x}" y="${center.y + lengthStrokePrimary * 2}" text-anchor="middle">${this.getDate()}</text>`;
svg += `<text id="day" class="tertiarty" x="${center.x}" y="${center.y + lengthStrokePrimary * 3.25}" text-anchor="middle">${this.getDay()}</text>`;
svg += `</g>`;
svg += `</svg>`;
return svg;
}
getTimezoneOffset() {
const utcOffset = this._datetime.getTimezoneOffset();
return ((utcOffset > 1 ? "+" : "-") +
Math.floor(Math.abs(utcOffset / 60))
.toFixed()
.padStart(2, "0") +
":" +
(utcOffset % 60).toFixed().padStart(2, "0"));
}
getDate() {
return (this._datetime.getFullYear() +
"-" +
(this._datetime.getMonth() + 1).toFixed().padStart(2, "0") +
"-" +
this._datetime.getDate().toFixed().padStart(2, "0"));
}
getDay() {
return ["SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"][this.datetime.getDay()];
}
getSvgCircle() {
const center = this.center;
const radiusHours = this.radiusHours;
const polyCoordinates = [];
let currentCoordinates = [];
let lastLight = this.getLight(0, 0);
for (let hours = 0; hours < 24; hours++) {
for (let minutes = 0; minutes < 60; minutes += 5) {
const angle = (hours + minutes / 60) * 15;
const c = this.getCircleCoordinates(angle, radiusHours);
c[0] += center.x;
c[1] += center.y;
const thisLight = this.getLight(hours, minutes);
if (thisLight !== lastLight) {
currentCoordinates.push(c.join(","));
polyCoordinates.push(`<polyline class="light light-${lastLight}" points="${currentCoordinates.join(" ")}" />`);
currentCoordinates = [];
}
lastLight = thisLight;
currentCoordinates.push(c.join(","));
}
}
currentCoordinates.push([center.x, center.y + radiusHours].join(","));
polyCoordinates.push(`<polyline class="light light-${lastLight}" points="${currentCoordinates.join(" ")}" />`);
return polyCoordinates.join();
}
drawNewDay() {
this.sunState =
this._longitude !== undefined && this._latitude !== undefined
? new TwentyfourSun(this._longitude, this._latitude, this._datetime, 0)
: undefined;
this.elements.svg.querySelector("#sunstate").innerHTML = this.getSvgCircle();
this.elements.svg.querySelector("#date").innerHTML = this.getDate();
this.elements.svg.querySelector("#day").innerHTML = this.getDay();
this.elements.svg.querySelector("#lon").innerHTML = this.longitudeString;
this.elements.svg.querySelector("#lat").innerHTML = this.latitudeString;
}
getLight(hours, minutes) {
if (!this.sunState) {
return "day";
}
this.sunState.localHours = hours + minutes / 60;
return this.sunState.getSunState(this.twilightDegree);
}
getCircleCoordinates(angle, radius) {
return [Math.sin((-angle / 180) * Math.PI) * radius, Math.cos((angle / 180) * Math.PI) * radius];
}
rotateWatchhands() {
const oldDate = this.getDate();
const ts = new Date().getTime();
const elapsedTime = ts - this.ts;
this.ts = ts;
this._datetime.setMilliseconds(this._datetime.getMilliseconds() + elapsedTime);
this.elements.svg.querySelector("#watchhand-seconds").setAttribute("transform", `rotate(${this.angleSeconds})`);
this.elements.svg.querySelector("#watchhand-minutes").setAttribute("transform", `rotate(${this.angleMinutes})`);
this.elements.svg.querySelector("#watchhand-hours").setAttribute("transform", `rotate(${this.angleHours})`);
this.elements.svg.querySelector("#watchhand-hours-utc").setAttribute("transform", `rotate(${this.angleHoursUtc})`);
//(this.elements.svg.querySelector("#utc") as SVGTextElement).innerHTML = "UTC " + this.getTimezoneOffset();
if (oldDate !== this.getDate()) {
this.drawNewDay();
}
}
get center() {
return { x: this.width / 2, y: this.height / 2 };
}
get radius() {
return Math.min(this.width, this.height) / 2;
}
get radiusMinutes() {
return Math.round(this.radius * 0.95);
}
get radiusHours() {
return Math.round(this.radius * 0.7);
}
get lengthStroke() {
return Math.max(2.5, Math.max(Math.round(this.radius * 0.05)));
}
get lengthStrokePrimary() {
return Math.round(this.radius * 0.1);
}
get angleHours() {
return ((this._datetime.getHours() + this._datetime.getMinutes() / 60 + this._datetime.getSeconds() / 3600) * 15 + 180);
}
get angleHoursUtc() {
return ((this._datetime.getUTCHours() + this._datetime.getUTCHours() / 60 + this._datetime.getUTCSeconds() / 3600) * 15 +
180);
}
get angleMinutes() {
return (this._datetime.getMinutes() + this._datetime.getSeconds() / 60) * 6;
}
get angleMinutesUtc() {
return (this._datetime.getUTCMinutes() + this._datetime.getUTCSeconds() / 60) * 6;
}
get angleSeconds() {
const ms = this.interval !== 1000
? (Math.round(this._datetime.getMilliseconds() / this.interval) * this.interval) / 1000
: 0;
return (this._datetime.getSeconds() + ms) * 6;
}
}
export class TwentyfourSun {
constructor(longitude, latitude, date, localHours) {
this.longitude = longitude;
this.latitude = latitude;
this.date = date;
this.localHours = localHours;
}
get solarTimeZoneOffset() {
return Math.round((this.longitude / 180) * 12);
}
/**
*@see https://stackoverflow.com/questions/8619879/javascript-calculate-the-day-of-the-year-1-366
*/
get dayOfYear() {
return ((Date.UTC(this.date.getFullYear(), this.date.getMonth(), this.date.getDate()) -
Date.UTC(this.date.getFullYear(), 0, 0)) /
24 /
60 /
60 /
1000);
}
/**
* In hours
*/
get localTime() {
return this.localHours + this.solarTimeZoneOffset + this.date.getTimezoneOffset() / 60;
}
/**
* In degrees
*/
get localSolarTimeMeridian() {
return Math.round(this.longitude / 15) * 15;
}
/**
* In minutes
*/
get equationOfTime() {
const b = ((2 * Math.PI) / 365) * (this.dayOfYear - 81);
return 9.87 * Math.sin(2 * b) - 7.53 * Math.cos(b) - 1.5 * Math.sin(b);
}
/**
* In minutes
*/
get timeCorrectionFactor() {
return 4 * (this.longitude - this.localSolarTimeMeridian) + this.equationOfTime;
}
/**
* In hours
*/
get localSolarTime() {
return (this.localTime + this.timeCorrectionFactor / 60 + 24) % 24;
}
/**
* In radians
*/
get hourAngle() {
return (2 / 24) * Math.PI * (this.localSolarTime - 12);
}
/**
* In radians
*/
get sunDeclination() {
const delta = 23.45 * Math.sin(((2 * Math.PI) / 365) * (this.dayOfYear - 81));
return (delta / 180) * Math.PI;
}
/**
* In radians
* @see https://www.pveducation.org/pvcdrom/properties-of-sunlight/the-suns-position
*/
get solarElevationAngle() {
const delta = this.sunDeclination;
const phi = (this.latitude / 180) * Math.PI;
return Math.asin(Math.sin(delta) * Math.sin(phi) + Math.cos(delta) * Math.cos(phi) * Math.cos(this.hourAngle));
}
/**
* @returns `sunState` for civil twilight
*/
getSunState(degree = -6) {
const solarElevationAngleDeg = (this.solarElevationAngle / Math.PI) * 180;
let sunState = TwentyfourSun.SUN_STATE_NIGHT;
if (solarElevationAngleDeg >= 0) {
sunState = TwentyfourSun.SUN_STATE_DAY;
}
else if (solarElevationAngleDeg <= degree) {
sunState = TwentyfourSun.SUN_STATE_NIGHT;
}
else {
sunState = this.localSolarTime < 12 ? TwentyfourSun.SUN_STATE_DUSK : TwentyfourSun.SUN_STATE_DAWN;
}
return sunState;
}
}
TwentyfourSun.SUN_STATE_DAY = "day";
TwentyfourSun.SUN_STATE_NIGHT = "night";
TwentyfourSun.SUN_STATE_DUSK = "dusk";
TwentyfourSun.SUN_STATE_DAWN = "dawn";
customElements.define("twentyfour-hours-clock", TwentyfourHourClock);