2022-07-26 11:08:26 +02:00
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<!DOCTYPE html>
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<html>
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<head>
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2022-08-03 14:23:24 +02:00
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<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
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<meta charset="utf-8">
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<meta name="theme-color" content="#222222">
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<title>WLED Live Preview</title>
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<style>
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body {
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margin: 0;
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}
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</style>
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2022-07-26 11:08:26 +02:00
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</head>
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<body>
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2022-08-03 14:23:24 +02:00
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<canvas id="liveviewCanvas">LiveView</canvas>
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<script>
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var c = document.getElementById('liveviewCanvas');
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var leds = "";
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var mW = 0, mH = 0, pPL = 0, lOf = 0;
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var throttled = false;
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function setCanvas() {
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c.width = window.innerWidth * 0.98; //remove scroll bars
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c.height = window.innerHeight * 0.98; //remove scroll bars
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}
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setCanvas();
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// Check for canvas support
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if (c.getContext) {
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// Access the rendering context
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var ctx = c.getContext('2d');
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function drawCircle(x, y, r, g, b, a) {
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ctx.fillStyle = `rgb(${r},${g},${b})`;
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ctx.beginPath();
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ctx.arc(x*pPL+pPL*0.5+lOf, y*pPL+pPL*0.5, pPL*0.4, 0, 2 * Math.PI);
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ctx.fill();
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}
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// use parent WS or open new
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var ws;
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try {
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ws = top.window.ws;
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} catch (e) {}
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if (ws && ws.readyState === WebSocket.OPEN) {
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ws.send("{'lv':true}");
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} else {
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ws = new WebSocket((window.location.protocol == "https:"?"wss":"ws")+"://"+document.location.host+"/ws");
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ws.onopen = ()=>{
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ws.send("{'lv':true}");
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}
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}
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ws.binaryType = "arraybuffer";
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ws.addEventListener('message',(e)=>{
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try {
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if (toString.call(e.data) === '[object ArrayBuffer]') {
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let leds = new Uint8Array(event.data);
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if (leds[0] != 76) return; //'L', set in ws.cpp
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mW = leds[2]; // matrix width
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mH = leds[3]; // matrix height
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pPL = Math.min(c.width / mW, c.height / mH); // pixels per LED (width of circle)
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lOf = Math.floor((c.width - pPL*mW)/2); //left offeset (to center matrix)
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for (i = 4; i < leds.length; i+=3) {
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let ff = (i-4)/3; // pixel index
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drawCircle(ff%mW, Math.floor(ff/mW), leds[i], leds[i+1], leds[i+2], 255);
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}
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}
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} catch (err) {
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console.error("Peek WS error:",err);
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}
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});
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}
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// window.resize event listener
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window.addEventListener('resize', (e)=>{
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if (!throttled) { // only run if we're not throttled
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setCanvas(); // actual callback action
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throttled = true; // we're throttled!
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setTimeout(()=>{ // set a timeout to un-throttle
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throttled = false;
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}, 250);
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}
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});
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</script>
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2022-07-26 11:08:26 +02:00
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</body>
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</html>
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