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May 18, 2023 16:27
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An animated observable line plot
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Interactive Observable Plot</title> | |
| <script type="module" src="/main.js"></script> | |
| </head> | |
| <style> | |
| :root { | |
| font-family: sans-serif; | |
| } | |
| .inputs { | |
| display: flex; | |
| flex-direction: column; | |
| max-width: 20rem; | |
| margin-top: 1rem; | |
| } | |
| .inputs > * { | |
| margin-bottom: 1rem; | |
| } | |
| </style> | |
| <body> | |
| <div id="vis"></div> | |
| <div class="inputs"> | |
| <label for="amplitude">Amplitude</label> | |
| <input type="range" id="amplitude" min="0" max="100" value="50" step="1"> | |
| <label for="frequency">Frequency</label> | |
| <input type="range" id="frequency" min="0" max="100" value="50" step="1"> | |
| <button id="button">Random</button> | |
| </div> | |
| </body> | |
| </html> |
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| import * as d3 from "https://esm.sh/d3@7"; | |
| import * as Plot from "https://esm.sh/@observablehq/[email protected]"; | |
| /** | |
| * Creates a `Plot.line` with a transition method that animates the line. | |
| * | |
| * @param {Array} data - the data to plot | |
| * @param {Object} options - the options to pass to `Plot.line` | |
| */ | |
| function lineY(data, options) { | |
| const base = Plot.lineY(data, options); | |
| const { render } = base; | |
| let renderGroups = []; | |
| let plotConfig; | |
| // overrides the render method to store the plot config and the rendered groups | |
| // so we can access them later in the transition method | |
| base.render = function (I, scales, channels, dimensions) { | |
| plotConfig = { scales, dimensions, channels }; | |
| let el = render.apply(this, arguments); | |
| renderGroups.push(el); | |
| return el; | |
| }; | |
| let line = d3.line(); | |
| base.transition = (update, { delay = 0, duration = 0 } = {}) => { | |
| let data = update.map((d, i) => [plotConfig.scales.x(i), plotConfig.scales.y(d)]); | |
| let paths = d3 | |
| .selectAll(renderGroups) | |
| .selectAll("path"); | |
| // if delay or duration is set, transition the path, otherwise set the path immediately | |
| if (delay > 0 || duration > 0) { | |
| paths = paths.transition().delay(delay).duration(duration); | |
| } | |
| paths.attr("d", line(data)); | |
| }; | |
| return base; | |
| } | |
| function main() { | |
| let amplitude = document.querySelector("#amplitude"); | |
| let frequency = document.querySelector("#frequency"); | |
| let button = document.querySelector("#button"); | |
| amplitude.value = 100; | |
| frequency.value = 100; | |
| // sine wave | |
| function y() { | |
| let freq = +frequency.value; | |
| let amp = +amplitude.value; | |
| return Array.from({ length: 500 }, (_, i) => amp * Math.sin(i / freq)); | |
| } | |
| let plot = lineY(y()); | |
| amplitude.addEventListener("input", () => plot.transition(y())); | |
| frequency.addEventListener("input", () => plot.transition(y())); | |
| button.addEventListener("click", () => { | |
| amplitude.value = Math.random() * 100; | |
| frequency.value = Math.random() * 100; | |
| plot.transition(y(), { delay: 200, duration: 1000 }); | |
| }); | |
| document.querySelector("#vis").appendChild(plot.plot()); | |
| } | |
| main(); |
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