167 lines
5.6 KiB
HTML
167 lines
5.6 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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Problem 5-23
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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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.dropbtn {
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background-color: #04AA6D;
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color: white;
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padding: 16px;
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font-size: 16px;
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border: none;
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}
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.dropbtnm {
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background-color: #04AA6D;
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color: white;
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padding: 16px;
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font-size: 16px;
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border: none;
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}
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.dropdown {
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position: absolute;
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display: inline-block;
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}
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.dropdown-content {
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display: none;
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position: relative;
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background-color: #f1f1f1;
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box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
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z-index: 1;
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}
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.dropdown-content button {
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color: black;
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padding: 12px 16px;
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width: 100px;
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text-decoration: none;
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display: block;
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}
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#m {
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left: 110px;
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}
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.dropdown-content a:hover {background-color: #ddd;}
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.dropdown:hover .dropdown-content {display: block;}
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.dropdown:hover .dropbtn {background-color: #3e8e41;}
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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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ctx.canvas.width = window.innerWidth;
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ctx.canvas.height = window.innerHeight;
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var n = 10;
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var g = 20;
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var h = 55;
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var r1 = 50;
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var rf = 0.25;
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var dr = 0.2;
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var drc = 0.1;
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var ballPositions = new Array(n);
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var ballVelocities = new Array(n);
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var t = 0;
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var dt = 0.025;
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var xPos = 0;
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var yPos = -200;
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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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ballPositions[0] = h;
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ballVelocities[0] = 0;
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for (i = 1; i < ballPositions.length; i++)
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{
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ballPositions[i] = ballPositions[i-1] + (rf ** (i-1)) * r1 + (rf ** i) * r1 + dr;
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ballVelocities[i] = 0;
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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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t += dt;
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for (i = 0; i < ballPositions.length; i++)
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{
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ballVelocities[i] -= g * dt;
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ballPositions[i] += ballVelocities[i] * dt;
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}
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for (i = 0; i < ballPositions.length; i++)
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{
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if (i == 0 && ballPositions[i] - r1 < drc)
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{
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ballVelocities[i] = -ballVelocities[i];
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ballPositions[i] += ballVelocities[i] * dt;
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} else if (i != 0 && ballPositions[i] - r1 * (rf ** i) < ballPositions[i - 1] + r1 * (rf ** (i - 1)) + drc)
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{
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ballVelocities[i] = -ballVelocities[i] + 2 * ballVelocities[i - 1];
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ballPositions[i] += ballVelocities[i] * dt;
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}
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}
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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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ctx.beginPath();
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ctx.moveTo(-c.width, yPos);
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ctx.lineTo(c.width, yPos);
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ctx.stroke();
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for (i = 0; i < ballPositions.length; i++)
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{
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ctx.beginPath();
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ctx.arc(0, ballPositions[i] + yPos, r1 * (rf ** i), 0, Math.PI * 2);
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ctx.stroke();
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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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}, 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> |