D3's general update pattern with a Voronoi diagram & rapidly updating data.
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September 30, 2022 16:15
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Voronoi Jiggle
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| license: gpl-3.0 |
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| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| .control { | |
| position: absolute; | |
| right: 5px; | |
| top: 5px; | |
| } | |
| .control .label { | |
| font-family: sans-serif; | |
| text-align: center; | |
| } | |
| .control input { | |
| display: inline-block; | |
| vertical-align: middle; | |
| } | |
| .control .value { | |
| display: inline-block; | |
| font-family: monospace; | |
| vertical-align: middle; | |
| } | |
| .voronoi { | |
| stroke: black; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="control"> | |
| <div class="label">Jiggle</div> | |
| <div class="range"> | |
| <input type="range" min="0.1" step="0.1" max="9.9" value="1.5"> | |
| <div class="value"></div> | |
| </div> | |
| </div> | |
| <div class="jiggle"></div> | |
| <script src="https://unpkg.com/[email protected]"></script> | |
| <script type="module"> | |
| import { Delaunay } from "https://cdn.skypack.dev/d3-delaunay@6"; | |
| import { interpolateLab } from "https://cdn.skypack.dev/d3-interpolate@3"; | |
| import { polygonArea } from "https://cdn.skypack.dev/d3-polygon@3"; | |
| import { randomUniform } from "https://cdn.skypack.dev/d3-random@3"; | |
| import { scaleLinear, scaleSequential } from "https://cdn.skypack.dev/d3-scale@4"; | |
| import { select } from "https://cdn.skypack.dev/d3-selection@3"; | |
| import { interval } from "https://cdn.skypack.dev/d3-timer@3"; | |
| import { transition } from "https://cdn.skypack.dev/d3-transition@3"; | |
| const { abs, max, min } = Math; | |
| const width = window.innerWidth; | |
| const height = window.innerHeight; | |
| const duration = 12; // milliseconds of transition duration | |
| const radius = 5; // circle radius | |
| const x = randomUniform(radius, width - radius); | |
| const y = randomUniform(radius, height - radius); | |
| const data = Array.from({ length: 64 }) | |
| .map((_, id) => ({ id, x: x(), y: y() })); | |
| const color = scaleSequential() | |
| .domain([0, width * height / data.length * 2]) | |
| .interpolator(interpolatePalette(["#fc8d62", "#ffd92f", "#66c2a5", "#8da0cb"])); | |
| const input = document.querySelector(".control input"); | |
| const value = document.querySelector(".control .value"); | |
| const svg = select(".jiggle").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| function redraw(data){ | |
| const voronoi = Array.from( | |
| Delaunay | |
| .from(data.map(({x, y}) => [x, y])) | |
| .voronoi([0, 0, width, height]) | |
| .cellPolygons(), | |
| (p, i) => Object.assign(p, { data: data[i] }) | |
| ); | |
| // transition | |
| const t = transition() | |
| .duration(duration); | |
| // JOIN | |
| const polygon = svg.selectAll(".voronoi") | |
| .data(voronoi, d => d.data.id); | |
| const circle = svg.selectAll(".dot") | |
| .data(data, d => d.id); | |
| // UPDATE | |
| polygon | |
| .transition(t) | |
| .attrTween("d", (d, i, e) => { | |
| const prev = select(e[i]).attr("d"); | |
| const curr = `M${d.join("L")}Z`; | |
| return flubber.interpolate(prev, curr); | |
| }) | |
| .style("fill", d => color(abs(polygonArea(d)))); | |
| circle | |
| .transition(t) | |
| .attr("cx", d => d.x) | |
| .attr("cy", d => d.y); | |
| // ENTER | |
| polygon.enter().append("path") | |
| .attr("class", "voronoi") | |
| .attr("d", d => `M${d.join("L")}Z`) | |
| .style("fill", d => color(abs(polygonArea(d)))); | |
| circle.enter().append("circle") | |
| .attr("class", "dot") | |
| .attr("r", 5) | |
| .attr("cx", d => d.x) | |
| .attr("cy", d => d.y); | |
| } | |
| redraw(data); | |
| interval(() => { | |
| const jiggle = +input.value; | |
| const random = randomUniform(-jiggle, jiggle); | |
| value.innerHTML = jiggle.toFixed(1); | |
| data.forEach(d => { | |
| d.x = min(width - radius, max(radius, d.x + random())); | |
| d.y = min(height - radius, max(radius, d.y + random())); | |
| return d; | |
| }); | |
| redraw(data); | |
| }, duration * 2); | |
| // https://observablehq.com/@harrystevens/roll-your-own-color-palette-interpolator | |
| function interpolatePalette(palette){ | |
| const domain = [0]; | |
| for (let i = 1, l = palette.length - 1; i <= l; i++){ | |
| domain[i] = i / l; | |
| } | |
| const scale = scaleLinear(domain, palette) | |
| .interpolate(interpolateLab) | |
| .clamp(true); | |
| return t => scale(t); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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