199 lines
7.6 KiB
HTML
199 lines
7.6 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 9-2
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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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</style>
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</head>
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<body>
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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 eps = new Array(3);
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eps[0] = .85;
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eps[1] = 2;
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eps[2] = 5;
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var mm = 40;
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var mmax = 80;
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var nn = 16;
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var nn4 = nn/4;
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var nmax = 2 * nn;
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var xPos = -50;
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var yPos = -50;
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var m = 1;
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var je = 1;
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var th = Math.atan(eps[je] / 2);
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var r = eps[je] / Math.sqrt(4 + Math.pow(eps[je], 2));
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var t = 2 / Math.sqrt(4 + Math.pow(eps[je], 2));
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var nth = (nn * th / 2 / Math.PI);
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ctx.translate(ctx.canvas.width / 2, ctx.canvas.height / 2);
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ctx.scale(3, -3);
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var y1 = new Array(nn + 1);
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var y2 = new Array(nn + 1);
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for (n = 0; n < nn + 1; n++)
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{
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y1[n] = new Array(mm + 1);
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y2[n] = new Array(mm + 1);
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for (m = 0; m < mm + 1; m++)
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{
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y1[n][m] = 10 * Math.cos(2 * Math.PI * (n / nn - m / mm));
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y2[n][m] = 10 * r * Math.cos(2 * Math.PI * (n / nn + m / mm));
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}
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}
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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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Clear(ctx);
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Draw();
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m += 1;
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console.log(m);
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setTimeout(Update, 1000/45)
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}
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function Draw()
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{
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ctx.strokeStyle = "#cccccc";
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ctx.lineWidth = 0.5;
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ctx.beginPath();
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ctx.moveTo(xPos + 10 + 80 / nmax, 15 + yPos);
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ctx.lineTo(xPos + 90 + 80 / nmax, 15 + yPos);
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ctx.stroke();
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ctx.beginPath();
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ctx.moveTo(xPos + 10 + 80 / nmax, 40 + yPos);
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ctx.lineTo(xPos + 90 + 80 / nmax, 40 + yPos);
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ctx.stroke();
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ctx.beginPath();
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ctx.moveTo(xPos + 10 + 80 / nmax, 75 + yPos);
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ctx.lineTo(xPos + 90 + 80 / nmax, 75 + yPos);
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ctx.stroke();
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ctx.strokeStyle = "#000000";
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ctx.lineWidth = 1;
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for (n = 1; n < nn; n++)
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{
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ctx.beginPath();
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ctx.moveTo(xPos + 10 + 80 * n / nmax, yPos + y1[n % nn][m % mm] + 15);
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ctx.lineTo(xPos + 10 + 80 * (n+1) / nmax, yPos + y1[(n+1) % nn][m % mm] + 15);
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ctx.stroke();
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ctx.beginPath();
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ctx.moveTo(xPos + 10 + 80 * n / nmax, yPos + y2[(nn + n - nth - nn4) % nn][m % mm] + 40);
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ctx.lineTo(xPos + 10 + 80 * (n+1) / nmax, yPos + y2[(nn + n - nth - nn4 +1) % nn][m % mm] + 40);
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ctx.stroke();
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ctx.beginPath();
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ctx.moveTo(xPos + 10 + 80 * n / nmax, yPos + y1[n % nn][m % mm] + y2[(nn + n - nth - nn4) % nn][m % mm] + 75);
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ctx.lineTo(xPos + 10 + 80 * (n+1) / nmax, yPos + y1[(n+1) % nn][m % mm] + y2[(nn + n - nth - nn4 + 1) % nn][m % mm] + 75);
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ctx.stroke();
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}
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for (n = nn; n <= nmax; n++)
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{
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ctx.beginPath();
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ctx.moveTo(xPos + 10 + 80 * n / nmax, yPos + t * y1[(n + nth) % nn][m % mm] + 15);
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ctx.lineTo(xPos + 10 + 80 * (n + 1) / nmax, yPos + t * y1[(n + nth + 1) % nn][m % mm] + 15);
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ctx.stroke();
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ctx.beginPath();
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ctx.moveTo(xPos + 10 + 80 * n / nmax, yPos + t * y1[(n + nth) % nn][m % mm] + 75);
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ctx.lineTo(xPos + 10 + 80 * (n + 1) / nmax, yPos + t * y1[(n + nth + 1) % nn][m % mm] + 75);
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ctx.stroke();
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}
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var n = nn;
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ctx.beginPath();
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ctx.arc(xPos + 10 + 80 * n / nmax, yPos + t * y1[(n + nth) % nn][m % mm] + 75, 1, 0, Math.PI * 2);
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ctx.fill();
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var i;
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}
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function Case1()
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{
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je = 0;
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var th = Math.atan(eps[je] / 2);
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var r = eps[je] / Math.sqrt(4 + Math.pow(eps[je], 2));
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var t = 2 / Math.sqrt(4 + Math.pow(eps[je], 2));
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var nth = (nn * th / 2 / Math.PI);
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for (n = 0; n < nn + 1; n++)
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{
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for (m = 0; m < mm + 1; m++)
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{
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y1[n][m] = 10 * Math.cos(2 * Math.PI * (n / nn - m / mm));
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y2[n][m] = 10 * r * Math.cos(2 * Math.PI * (n / nn + m / mm));
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}
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}
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}
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function Case2()
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{
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je = 1;
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var th = Math.atan(eps[je] / 2);
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var r = eps[je] / Math.sqrt(4 + Math.pow(eps[je], 2));
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var t = 2 / Math.sqrt(4 + Math.pow(eps[je], 2));
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var nth = (nn * th / 2 / Math.PI);
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for (n = 0; n < nn + 1; n++)
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{
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for (m = 0; m < mm + 1; m++)
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{
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y1[n][m] = 10 * Math.cos(2 * Math.PI * (n / nn - m / mm));
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y2[n][m] = 10 * r * Math.cos(2 * Math.PI * (n / nn + m / mm));
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}
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}
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}
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function Case3()
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{
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je = 2;
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var th = Math.atan(eps[je] / 2);
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var r = eps[je] / Math.sqrt(4 + Math.pow(eps[je], 2));
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var t = 2 / Math.sqrt(4 + Math.pow(eps[je], 2));
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var nth = (nn * th / 2 / Math.PI);
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for (n = 0; n < nn + 1; n++)
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{
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for (m = 0; m < mm + 1; m++)
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{
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y1[n][m] = 10 * Math.cos(2 * Math.PI * (n / nn - m / mm));
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y2[n][m] = 10 * r * Math.cos(2 * Math.PI * (n / nn + m / mm));
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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(3, -3);
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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>
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