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