271 lines
8.7 KiB
HTML
271 lines
8.7 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: Lens
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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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.slideContainer {
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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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<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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<form>
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<label for="toggle">Position indicators</label>
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<input type="checkbox" id="toggle" onclick="toggleClick()">
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</form>
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<div class="slidecontainer">
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<t>X position</t>
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<input type="range" min="-350" max="350" value="0" step = "1" id="xSlider">
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<br>
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<t>Y position</t>
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<input type="range" min="-150" max="150" value="0" step = "1" id="ySlider">
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<br>
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<t>Focal length</t>
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<input type="range" min="-50" max="100" value="50" step = "1" id="fSlider">
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</div>
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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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ctx.canvas.width = window.innerWidth;
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ctx.canvas.height = window.innerHeight;
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var f = 50;
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var cll = "#000000";
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var clb = "#0000ff";
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var nxb = 3;
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var nyb = 3;
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var dt = .03;
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var a = new Array(6);
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for (i = 0; i < 6; i++)
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{
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a[i] = new Array(6);
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}
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var xAdj = 0;
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var x0 = xAdj - c.width / (2 * 1.5);
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var y0 = 0;
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var x1 = 0;
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var y1 = 30;
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var xs = c.width / (2 * 1.5);
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var dx = 5;
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var dy = 5;
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var t = 0;
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var m = 1;
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var toggle = false;
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var xPos = 0;
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var yPos = 0;
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var xSlider = document.getElementById("xSlider");
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var ySlider = document.getElementById("ySlider");
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var fSlider = document.getElementById("fSlider");
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xSlider.max = c.width / (2 * 1.5) - 30;
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if (xAdj > xSlider.max)
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{
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xAdj = xSlider.max;
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}
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x0 = xAdj - c.width / (2 * 1.5) - 5;
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xs = c.width / (2 * 1.5);
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xSlider.oninput = function()
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{
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xAdj = parseFloat(this.value);
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x0 = xAdj - c.width / (2 * 1.5);
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}
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ySlider.oninput = function()
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{
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y0 = parseFloat(this.value);
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}
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fSlider.oninput = function()
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{
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f = parseFloat(this.value);
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}
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function fnys(pxs, pf, px0, py0, px1, py1)
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{
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return ((py1 - py0) / (px1 - px0) - py1 / pf) * (pxs - px1) + py1;
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}
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ctx.translate(ctx.canvas.width / 2, ctx.canvas.height / 2);
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ctx.scale(1.5, -1.5);
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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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setTimeout(Update, 1000/60);
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}
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function Draw()
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{
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ys = fnys(xs, f, x0, y0, x1, y1);
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ctx.strokeStyle = cll;
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ctx.beginPath();
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ctx.moveTo(xPos + x1, yPos + y1);
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ctx.lineTo(xPos + x1, yPos - y1);
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ctx.stroke();
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ctx.beginPath();
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ctx.arc(xPos + x0, yPos + y0, 4, 0, Math.PI * 2);
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ctx.stroke();
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v = fnys(xs, f, x0, y0, x1, -y1) - fnys(xs, f, x0, y0, x1, y1) + 2 * y1;
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if (f != 0)
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{
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console.log("f != 0");
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xv = 2 * y1 * (xs - x1) / v;
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yv = y1 + xv * (fnys(xs, f, x0, y0, x1, y1) - y1) / (xs - x1);
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ctx.strokeStyle = clb;
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ctx.beginPath();
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ctx.arc(xPos + xv, yPos + yv, 4, 0, Math.PI * 2);
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ctx.stroke();
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}
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ray(xs, f, x0, y0, x1, y1, clb, xv, yv);
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ray(xs, f, x0, y0, x1, -y1, clb, xv, yv);
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ray(xs, f, x0, y0, x1, 0, clb, xv, yv);
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/*ray(xs, f, x0, 0, x1, y1, "#00ffff");
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ray(xs, f, x0, 0, x1, -y1, "#00ffff");
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ray(xs, f, x0, 0, x1, 0, "#00ffff");*/
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if (toggle)
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{
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for (j = -150; j <= 140; j += 10)
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{
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ctx.strokeStyle = "#000000";
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ctx.beginPath();
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ctx.moveTo(xPos + xv, yPos + j);
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ctx.lineTo(xPos + xv, yPos + j + 5);
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ctx.stroke();
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ctx.beginPath();
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ctx.moveTo(xPos + x0, yPos + j);
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ctx.lineTo(xPos + x0, yPos + j + 5);
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ctx.stroke();
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}
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}
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}
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function ray(pxs, pf, px0, py0, px1, py1, pclb, pxv, pyv)
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{
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if (px0 <= px1)
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{
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ctx.strokeStyle = pclb;
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ctx.beginPath();
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ctx.moveTo(xPos + px0, yPos + py0);
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ctx.lineTo(xPos + px1, yPos + py1);
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ctx.stroke();
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} else
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{
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ctx.strokeStyle = pclb;
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ctx.beginPath();
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ctx.moveTo(xPos - pxs, yPos + py1 - pxs * (py1 - py0) / (px1 - px0));
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ctx.lineTo(xPos + px1, yPos + py1);
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ctx.stroke();
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}
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ctx.strokeStyle = "#00ffff";
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ctx.beginPath();
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ctx.moveTo(xPos + xs, yPos + fnys(pxs, pf, px0, py0, px1, py1));
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ctx.lineTo(xPos + px1, yPos + py1);
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ctx.stroke();
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console.log(pxs, px1);
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if (pxv < px1)
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{
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ctx.strokeStyle = "#000000";
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ctx.setLineDash([5, 5]);
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ctx.beginPath();
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ctx.moveTo(xPos + px1, yPos + py1);
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ctx.lineTo(xPos + pxv, yPos + pyv);
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ctx.stroke();
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ctx.setLineDash([]);
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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(1.5, -1.5);
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xSlider.max = c.width / (2 * 1.5) - 30;
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if (xAdj > xSlider.max)
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{
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xAdj = xSlider.max;
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}
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x0 = xAdj - c.width / (2 * 1.5);
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xs = c.width / (2 * 1.5);
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}, true);
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/*document.onkeydown = checkKey;
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function checkKey(e) {
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e = e || window.event;
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if (e.keyCode == '38') {
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yplus();
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}
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else if (e.keyCode == '40') {
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yminus();
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}
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else if (e.keyCode == '37') {
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xminus();
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}
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else if (e.keyCode == '39') {
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xplus();
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}
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else if (e.keyCode == '49') {
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//togglec();
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}
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else if (e.keyCode == '50') {
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toggled();
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}
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else if (e.keyCode == '51') {
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//togglee();
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}
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}*/
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function toggleClick()
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{
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checkBox = document.getElementById("toggle");
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toggle = checkBox.checked;
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Clear(ctx);
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}
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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> |