WLED/wled00/data/liveview.htm

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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
<meta charset="utf-8">
<meta name="theme-color" content="#222222">
<title>WLED Live Preview</title>
<style>
body {
margin: 0;
}
#canv {
background: black;
filter: brightness(175%);
width: 100%;
height: 100%;
position: absolute;
}
</style>
<script>
var ws;
var tmout = null;
function update() // via HTTP (/json/live)
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{
if (document.hidden) {
clearTimeout(tmout);
tmout = setTimeout(update, 250);
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return;
}
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fetch('./json/live')
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.then(res => {
if (!res.ok) {
clearTimeout(tmout);
tmout = setTimeout(update, 2500);
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}
return res.json();
})
.then(json => {
var str = "linear-gradient(90deg,";
var len = json.leds.length;
for (i = 0; i < len; i++) {
var leddata = json.leds[i];
if (leddata.length > 6) leddata = leddata.substring(2);
str += "#" + leddata;
if (i < len -1) str += ","
}
str += ")";
document.getElementById("canv").style.background = str;
clearTimeout(tmout);
tmout = setTimeout(update, 40);
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})
.catch(function (error) {
clearTimeout(tmout);
tmout = setTimeout(update, 2500);
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})
}
function S() { // Startup function (onload)
let wsOn = (window.location.href.indexOf("?ws") > 0);
if (!wsOn) {update(); return;}
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// Initialize WebSocket connection
try {
ws = top.window.ws;
} catch (e) {}
if (ws && ws.readyState === WebSocket.OPEN) {
//console.info("Peek uses top WS");
ws.send("{'lv':true}");
} else {
//console.info("Peek WS opening");
let l = window.location;
let pathn = l.pathname;
let paths = pathn.slice(1,pathn.endsWith('/')?-1:undefined).split("/");
let url = l.origin.replace("http","ws");
if (paths.length > 1) {
url += "/" + paths[0];
}
ws = new WebSocket(url+"/ws");
ws.onopen = function () {
//console.info("Peek WS open");
ws.send("{'lv':true}");
}
}
ws.binaryType = "arraybuffer";
ws.addEventListener('message', (e) => {
try {
if (toString.call(e.data) === '[object ArrayBuffer]') {
let leds = new Uint8Array(event.data);
if (leds[0] != 76) return; //'L'
let str = "linear-gradient(90deg,";
let len = leds.length;
let start = leds[1]==2 ? 4 : 2; // 1 = 1D, 2 = 1D/2D (leds[2]=w, leds[3]=h)
for (i = start; i < len; i+=3) {
str += `rgb(${leds[i]},${leds[i+1]},${leds[i+2]})`;
if (i < len -3) str += ","
}
str += ")";
document.getElementById("canv").style.background = str;
}
} catch (err) {
console.error("Peek WS error:",err);
}
});
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}
</script>
</head>
<body onload="S()">
<div id="canv"></div>
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</body>
</html>