178 lines
5.2 KiB
HTML
178 lines
5.2 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- ahhh -->
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<body style="margin: 0; overflow: hidden">
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<canvas
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id="myCanvas"
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width="10"
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height="10"
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style="display: block; box-sizing: border-box"
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>
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Your browser does not support the HTML5 canvas tag.</canvas
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>
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<script src="https://unpkg.com/@ffmpeg/ffmpeg@0.10.0/dist/ffmpeg.min.js"></script>
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<script>
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const { createFFmpeg } = FFmpeg;
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const ffmpeg = createFFmpeg({
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log: true,
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});
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const transcode = async (webcamData) => {
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const message = document.getElementById("message");
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const name = "record.webm";
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await ffmpeg.load();
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message.innerHTML = "Start transcoding";
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await ffmpeg.write(name, webcamData);
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await ffmpeg.transcode(name, "output.mp4");
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message.innerHTML = "Complete transcoding";
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const data = ffmpeg.read("output.mp4");
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const video = document.getElementById("output-video");
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video.src = URL.createObjectURL(
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new Blob([data.buffer], { type: "video/mp4" })
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);
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dl.href = video.src;
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dl.innerHTML = "download mp4";
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};
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fn().then(async ({ url, blob }) => {
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transcode(new Uint8Array(await blob.arrayBuffer()));
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});
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function fn() {
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var recordedChunks = [];
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var time = 0;
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var canvas = document.getElementById("canvas");
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return new Promise(function (res, rej) {
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var stream = canvas.captureStream(60);
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mediaRecorder = new MediaRecorder(stream, {
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mimeType: "video/webm; codecs=vp9",
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});
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mediaRecorder.start(time);
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mediaRecorder.ondataavailable = function (e) {
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recordedChunks.push(event.data);
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// for demo, removed stop() call to capture more than one frame
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};
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mediaRecorder.onstop = function (event) {
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var blob = new Blob(recordedChunks, {
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type: "video/webm",
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});
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var url = URL.createObjectURL(blob);
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res({ url, blob }); // resolve both blob and url in an object
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myVideo.src = url;
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// removed data url conversion for brevity
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};
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// for demo, draw random lines and then stop recording
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var i = 0,
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tid = setInterval(() => {
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if (i++ > 20) {
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// draw 20 lines
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clearInterval(tid);
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mediaRecorder.stop();
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}
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let canvas = document.querySelector("canvas");
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let cx = canvas.getContext("2d");
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cx.beginPath();
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cx.strokeStyle = "green";
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cx.moveTo(Math.random() * 100, Math.random() * 100);
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cx.lineTo(Math.random() * 100, Math.random() * 100);
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cx.stroke();
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}, 200);
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});
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}
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let c = document.getElementById("myCanvas");
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let ctx = c.getContext("2d");
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ctx.canvas.width = window.innerWidth;
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ctx.canvas.height = window.innerHeight;
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let deg_per_sec = 30 / 5000;
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let time = 0.1;
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let fps = 60;
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centerX = ctx.canvas.width / 2;
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centerY = ctx.canvas.height / 2;
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rotation = 0; //was = j = angle
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currentFrame = 0; //was = i
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function render() {
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if (currentFrame < time / (1 / fps)) {
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setTimeout(() => {
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render();
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render_clear();
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// Draw_Phyllotaxis(rotation + 3.1);
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Draw_Phyllotaxis(rotation + 1.5);
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console.log(rotation + 3.1);
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// Draw_Phyllotaxis(rotation/5000);
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// Draw_center(); //Debugging
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// DrawBorder();
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}, 1000 / fps);
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rotation += deg_per_sec / fps; // was = j = angle, now = rotation
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currentFrame += 1; // was = i
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}
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}
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render();
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function Draw_Phyllotaxis(angle) {
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// colour1 = [255, 170, 0];
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// colour2 = [255, 0, 221];
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colour1 = [45, 129, 252];
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colour2 = [252, 3, 98];
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var c = 24; //something to do with width. but not width
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for (let n = 0; n < 300; n += 1) {
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ncolour = LerpRGB(colour1, colour2, Math.cos(rad(n / 2)));
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var a = n * angle; //137.5;
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var r = c * Math.sqrt(n);
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var x = r * Math.cos(a) + centerX;
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var y = r * Math.sin(a) + centerY;
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ctx.beginPath();
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ctx.arc(x, y, 8, 0, 2 * Math.PI);
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ctx.fillStyle = colourToText(ncolour);
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ctx.fill();
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}
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}
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function rad(degrees) {
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var pi = Math.PI;
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return degrees * (pi / 180);
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}
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function LerpRGB(a, b, t) {
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if (t < 0) {
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t *= -1;
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}
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var newColor = [0, 0, 0];
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newColor[0] = a[0] + (b[0] - a[0]) * t;
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newColor[1] = a[1] + (b[1] - a[1]) * t;
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newColor[2] = a[2] + (b[2] - a[2]) * t;
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return newColor;
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}
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function colourToText(colour) {
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return "rgb(" + colour[0] + "," + colour[1] + "," + colour[2] + ")";
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}
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function render_clear() {
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ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
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ctx.fillStyle = "black";
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ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
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}
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</script>
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</body>
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</html>
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