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<!DOCTYPE html> |
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<html> |
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<head> |
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<style> |
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body { |
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background-color: black; |
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color: rgb(200, 200, 200); |
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margin: 0px; |
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} |
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table { |
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margin-left: 10px; |
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} |
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</style> |
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</head> |
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<body> |
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<canvas></canvas> |
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<table> |
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<tr id="feedback"></tr> |
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<tr> |
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<td><input type="range" min="10" max="100" oninput="draw()"></td> |
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<td><input type="range" min="10" max="100" oninput="draw()"></td> |
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<td><input type="range" min="10" max="100" oninput="draw()"></td> |
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<td><button onclick="newURL()">Save This Wave</button></td> |
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</tr> |
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</table> |
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</body> |
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<script> |
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const width = innerWidth, height = 600; |
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const canvas = document.getElementsByTagName('canvas')[0]; |
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canvas.width = width; |
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canvas.height = height; |
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const canvasCtx = canvas.getContext('2d') |
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const inputs = document.getElementsByTagName('input'); |
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const search = window.location.search.split('?')[1]; |
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let fVals = search ? search.split(',') : []; |
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for (let i in inputs) { |
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inputs[i].value = fVals[i] ? +fVals[i] : 10 + Math.random() * 50 |
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} |
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draw(); |
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function draw() { |
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canvasCtx.fillStyle = 'rgb(0, 0, 0)'; |
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canvasCtx.fillRect(0, 0, width, height); |
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fVals = []; |
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for (let d of document.getElementsByTagName('input')) fVals.push(+d.value); |
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const LCM = getLCM(getLCM(fVals[0], fVals[1]), fVals[2]) * 2 + 1; |
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document.getElementById('feedback').innerHTML = '' + |
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'<td>freq. #1: ' + fVals[0] + '</td>' + |
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'<td>freq. #2: ' + fVals[1] + '</td>' + |
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'<td>freq. #3: ' + fVals[2] + '</td>' + |
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'<td>Compound wavelength: ' + LCM.toLocaleString() + '</td>'; |
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if (LCM > 500000) canvasCtx.lineWidth = .1 |
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else if (LCM > 100000) canvasCtx.lineWidth = .2 |
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else if (LCM > 10000) canvasCtx.lineWidth = .35 |
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else if (LCM > 1000) canvasCtx.lineWidth = .75 |
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else canvasCtx.lineWidth = 1 |
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canvasCtx.strokeStyle = 'rgb(255, 50, 50)'; |
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canvasCtx.beginPath(); |
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for (let i=0; i<LCM; i++) { |
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const thisAngle = i / (LCM-1) * Math.PI * 2 |
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let combinedVal = 0; |
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for (d of fVals) { |
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combinedVal += (1 - Math.cos(Math.PI * (i % (d * 2) - d) / d)) / 2; |
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} |
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const x = width/2 + combinedVal * 100 * Math.cos(thisAngle); |
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const y = height/2 + combinedVal * 100 * Math.sin(thisAngle); |
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i === 0 ? canvasCtx.moveTo(x, y) : canvasCtx.lineTo(x, y); |
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} |
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canvasCtx.stroke(); |
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} |
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function newURL() { |
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prompt('URL for these frequencies:', window.location.href.split('?')[0] + '?' + fVals.join(',')) |
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} |
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function getLCM(a, b) { |
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return (a / getGCD(a, b) * b) |
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} |
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function getGCD(a,b) { |
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while (true) { |
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if (b == 0) return a; |
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a %= b; |
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if (a == 0) return b; |
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b %= a; |
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} |
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} |
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</script> |
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</html> |
