130 lines
4.4 KiB
HTML
130 lines
4.4 KiB
HTML
<html>
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<head>
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<title>
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Waves: Chladni plates
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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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<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="x">X mode</label>
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<input type="number" id="x" min="0" max="10" step="1" value="1">
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<br>
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<label for="y">Y mode</label>
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<input type="number" id="y" min="0" max="10" step="1" value="1">
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</form>
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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 xMode = document.getElementById("x").value;
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var yMode = document.getElementById("y").value;
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var step = 0.01;
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var sandThreshold = 0.01;
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var plateSize = 53;
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var xPos = 0;
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var yPos = 0;
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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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setTimeout(Update, 1000/60);
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if (xMode != document.getElementById("x").value)
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{
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xMode = parseFloat(document.getElementById("x").value);
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sandThreshold = 0.065 + 0.055 * (1.02 ** (xMode + yMode));
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Clear(ctx);
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Draw();
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}
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if (yMode != document.getElementById("y").value)
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{
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yMode = parseFloat(document.getElementById("y").value);
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sandThreshold = 0.065 + 0.055 * (1.02 ** (xMode + yMode));
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Clear(ctx);
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Draw();
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}
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}
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Update();
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function Draw()
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{
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ctx.beginPath();
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ctx.moveTo(xPos - plateSize, yPos - plateSize);
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ctx.lineTo(xPos + plateSize, yPos - plateSize);
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ctx.lineTo(xPos + plateSize, yPos + plateSize);
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ctx.lineTo(xPos - plateSize, yPos + plateSize);
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ctx.lineTo(xPos - plateSize, yPos - plateSize);
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ctx.stroke();
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for (x = -1; x <= 0; x += step)
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{
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for (y = -1; y <= 0; y += step)
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{
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if (Math.random() >= 0)
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{
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phi = (Math.cos(xMode * x * Math.PI) * Math.cos(yMode * y * Math.PI)) + (Math.cos(xMode * y * Math.PI) * Math.cos(yMode * x * Math.PI));
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console.log(phi);
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if (phi <= sandThreshold && phi >= -sandThreshold)
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{
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ctx.beginPath();
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ctx.arc(x * plateSize + xPos, y * plateSize + yPos, step * plateSize, 0, Math.PI * 2);
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ctx.fill();
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ctx.beginPath();
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ctx.arc(-x * plateSize + xPos, y * plateSize + yPos, step * plateSize, 0, Math.PI * 2);
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ctx.fill();
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ctx.beginPath();
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ctx.arc(x * plateSize + xPos, -y * plateSize + yPos, step * plateSize, 0, Math.PI * 2);
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ctx.fill();
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ctx.beginPath();
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ctx.arc(-x * plateSize + xPos, -y * plateSize + yPos, step * plateSize, 0, Math.PI * 2);
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ctx.fill();
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console.log("point");
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}
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}
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}
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}
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}
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Draw();
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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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Clear(ctx);
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Draw();
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}, true);
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</script>
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</body>
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</html> |