153 lines
5.2 KiB
HTML
153 lines
5.2 KiB
HTML
<!--
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This work is licensed under CC BY-NC-ND 4.0
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Link to license: http://creativecommons.org/licenses/by-nc-nd/4.0/
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Attribute to Russell Georgi
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-->
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<html>
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<head>
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<title>
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Waves 10-3
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</title>
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<style>
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html, body {
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width: 100%;
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height: 100%;
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margin: 0px;
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border: 0;
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overflow: hidden;
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display: block;
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}
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canvas {
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position: absolute;
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}
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form {
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position: relative;
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}
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</style>
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</head>
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<body>
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<form>
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<label for="ratio">k2 / k1</label>
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<input type="number" id="ratio" name="ratio" min="0" max="10" step = "0.1" value = "1">
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</form>
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<canvas id="myCanvas" width="1" height="1" style="border:1px solid #ffffff;">
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Your browser does not support the HTML5 canvas tag.</canvas>
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<script>
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var c = document.getElementById("myCanvas");
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var ctx = c.getContext("2d");
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c.width = window.innerWidth;
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c.height = window.innerHeight;
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var k = 1;
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var eps = parseFloat(document.getElementById("ratio").value);
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var tau = 2 / (1 + eps);
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var r = (1 - eps) / (1 + eps);
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var kappa = .05;
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var dt = .2 * (1 + eps);
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var t = -30;
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var nn = 40;
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var m = 1;
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var color1
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var xPos = 0;
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var yPos = -50;
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ctx.translate(ctx.canvas.width / 2, ctx.canvas.height / 2)
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ctx.scale(4, -4);
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function Clear(ctx)
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{
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ctx.clearRect(-c.width, -c.height, c.width * 2, c.height * 2);
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}
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function Update()
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{
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if (parseFloat(document.getElementById("ratio").value) != eps)
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{
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eps = parseFloat(document.getElementById("ratio").value);
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tau = 2 / (1 + eps);
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r = (1 - eps) / (1 + eps);
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kappa = .05;
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dt = .2 * (1 + eps);
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t = -30;
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nn = 40;
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}
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Clear(ctx);
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Draw();
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t += dt;
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if (eps <= 1)
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{
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if (t > 30)
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{
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t = -30;
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}
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}
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if (eps > 1)
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{
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if (t > 30 * eps)
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{
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t = -30;
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}
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}
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m += 1;
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ctx.strokeStyle = "#000000";
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setTimeout(Update, 1000/60)
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}
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function y(x)
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{
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if (kappa * x * x < 10)
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{
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return Math.exp(-kappa * x * x);
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} else
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{
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return 0;
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}
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}
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function Draw()
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{
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for (n = -nn/2; n <= -1; n++)
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{
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ctx.strokeStyle = "#ee0000";
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ctx.beginPath();
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ctx.moveTo(xPos + 100 * n / nn, yPos + 20 * (y(n - t) + r * y(-n -t)) + 50);
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ctx.lineTo(xPos + 100 * (n + 1) / nn, yPos + 20 * (y(n + 1 - t) + r * y( - n - 1 - t)) + 50);
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ctx.stroke();
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}
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if (eps == 0)
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{
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ctx.strokeStyle = "#9999ff";
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ctx.beginPath();
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ctx.moveTo(xPos, yPos + 20 * tau * y(-t) + 50);
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ctx.lineTo(xPos + 50, yPos + 20 * tau * y(-t) + 50);
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ctx.stroke();
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} else
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{
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for (n = 0; n <= eps * nn / 2 - 1; n++)
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{
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ctx.strokeStyle = "#9999ff";
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ctx.beginPath();
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ctx.moveTo(xPos + 100 * n / nn / eps, yPos + 20 * tau * y(n-t) + 50);
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ctx.lineTo(xPos + 100 * (n + 1) / nn / eps, yPos + 20 * tau * y((n + 1)-t) + 50);
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ctx.stroke();
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}
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}
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}
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window.addEventListener('resize', function(event) {
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c.width = window.innerWidth;
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c.height = window.innerHeight;
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ctx.translate(c.width / 2, c.height / 2);
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ctx.scale(4, -4);
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}, true);
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Update();
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</script>
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</body>
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<p xmlns:cc="http://creativecommons.org/ns#" style="font-size: 1vw; bottom: 0px; position: absolute;">
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This work is licensed under
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<a href="http://creativecommons.org/licenses/by-nc-nd/4.0/?ref=chooser-v1" target="_blank" rel="license noopener noreferrer" style="display:inline-block;">CC BY-NC-ND 4.0<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/cc.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/by.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/nc.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/nd.svg?ref=chooser-v1"></a></p>
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</html> |