122 lines
4.7 KiB
HTML
122 lines
4.7 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 1-1
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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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//Time step
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var dt = .05;
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//Time
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var m = 1;
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//Parameter interval for spring
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var tStep = 0.1;
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//Relative position of canvas
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var xPos = 0;
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var yPos = 0;
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//Moves and scales canvas
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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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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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ctx.strokeStyle = "#000000";
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/*
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var i;
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for(i=-360; i<360; i+= 20/3){
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ctx.moveTo(0,i + (5/3));
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ctx.lineTo(0,i);
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}
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ctx.stroke();
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*/
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//Spinning line
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ctx.beginPath();
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ctx.moveTo(xPos, yPos);
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ctx.lineTo(xPos + 25 * Math.cos(dt * m), yPos + -25 * Math.sin(dt * m));
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ctx.stroke();
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//One-dimensional SHM
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ctx.strokeStyle = "#FF0000";
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ctx.beginPath();
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ctx.moveTo(xPos, yPos - 25);
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ctx.lineTo(xPos + 25 * Math.cos(dt * m), yPos - 25);
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ctx.stroke();
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ctx.strokeStyle = "#0000FF";
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//Mass on spring
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drawSpring(1, 3, 25 * Math.cos(dt * m) + 48, 5, 7, xPos - 50, yPos + 25, tStep);
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ctx.beginPath();
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ctx.arc(xPos + 25 * Math.cos(dt * m), yPos + 25, 2, 0, 2 * Math.PI);
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ctx.fill();
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m += 1;
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console.log(m);
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setTimeout(Update, 1000/60)
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}
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function drawSpring(a, b, xSize, ySize, numLoops, x, y, tStep)
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{
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//Draws coiled spring using prolate cycloid
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var tStart = Math.PI / 2;
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var tEnd = (3 * Math.PI / 2) + (2 * Math.PI * numLoops);
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var xEnd = a * tEnd - b * Math.sin(tEnd);
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var yEnd = a + b;
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var xFactor = xSize / xEnd;
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var yFactor = ySize / yEnd;
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var xShift = x - a * (Math.PI / 2) + b * Math.sin(Math.PI / 2);
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var yShift = y - a + b * Math.cos(Math.PI / 2);
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for (t = tStart; t <= tEnd; t += tStep)
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{
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ctx.beginPath();
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ctx.moveTo(xShift + xFactor * (a * t - b * Math.sin(t)), yShift + yFactor * (a - b * Math.cos(t)));
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ctx.lineTo(xShift + xFactor * (a * (t + tStep) - b * Math.sin(t + tStep)), yShift + yFactor * (a - b * Math.cos(t + tStep)));
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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(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> |