105 lines
2.6 KiB
JavaScript
105 lines
2.6 KiB
JavaScript
function randInt(min,max) {
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return Math.floor(Math.random() * (max - min + 1)) + min;
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}
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function convertData(text, base){
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var output = "";
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for (var i = 0; i < text.length; i++)
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{
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var letter = text[i].charCodeAt(0).toString(base);
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output += letter;
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}
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return output;
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}
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function generateString() {
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var final = "";
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var length = randInt(50,100);
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for(var i = 0; i < length; i++) {
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final += randInt(0,1);
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}
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return final;
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}
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function generateFrames(frame, string, width, height, rate) {
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// Rate is in bits per second
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// 30 frames per second
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var bitsPerSection = Math.ceil(canvas.width/width);
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var shift = canvas.width-rate*width*frame/30;
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var bitsToCalc = Math.ceil(rate*width*frame/(width*30));
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var output = [];
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for(var i = bitsToCalc-bitsPerSection; i < bitsToCalc; i++) {
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try {
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var x = i*width;
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if(parseInt(string[i])) {
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output.push([x+shift, -height+canvas.height/2]);
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output.push([x+width+shift, -height+canvas.height/2]);
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if(string[i-1] === 0) {
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output.push([x+width+shift, canvas.height/2]);
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}
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} else {
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output.push([x+shift, canvas.height/2]);
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output.push([x+width+shift,canvas.height/2]);
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}
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} catch(err) {}
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}
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return output;
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}
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function drawFrame(frame ,input) {
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visualCtx.fillRect(0,0, canvas.width, canvas.height);
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visualCtx.beginPath();
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var frame = generateFrames(frame, input, 100, 100, 100);
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visualCtx.moveTo(0, canvas.height/2);
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for(var i = 0; i < frame.length; i++) {
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visualCtx.lineTo(frame[i][0], frame[i][1]);
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}
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visualCtx.strokeStyle="#4CAF50";
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visualCtx.stroke();
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}
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function getWebsite(url) {
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var proxy = "https://cors-anywhere.herokuapp.com/";
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var xhr = new XMLHttpRequest();
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xhr.open("GET", proxy+url, false);
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xhr.send();
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return xhr.responseText;
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}
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function animate(n , input) {
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if(!doAnimate) return;
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drawFrame(n, input);
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setTimeout(function() { animate(n+1, input) }, 100/3);
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}
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function sound(n, input) {
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if(n === 0) {
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osc.connect(audioCtx.destination);
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osc2.connect(audioCtx.destination);
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osc3.connect(audioCtx.destination);
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osc.start(0);
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}
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osc.frequency.value = freq[input[n]];
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setTimeout(function() { sound(n+1, input); }, 500);
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}
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var canvas = document.getElementById("canvas");
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var visualCtx = canvas.getContext("2d");
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var audioCtx = new window.AudioContext();
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var osc = audioCtx.createOscillator();
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var doAnimate = true;
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var freq = [440, 494, 523, 587, 660, 698, 784, 880];
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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visualCtx.fillStyle = "#000";
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visualCtx.fillRect(0,0, canvas.width, canvas.height);
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animate(0, convertData(getWebsite("https://www.google.com"), 2));
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sound(0, convertData(getWebsite("https://www.google.com"), 8));
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