WordCloud(words, {
width,
height: 500,
invalidation // a promise to stop the simulation when the cell is re-run
})
function WordCloud(text, {
size = group => group.length, // Given a grouping of words, returns the size factor for that word
word = d => d, // Given an item of the data array, returns the word
marginTop = 0, // top margin, in pixels
marginRight = 0, // right margin, in pixels
marginBottom = 0, // bottom margin, in pixels
marginLeft = 0, // left margin, in pixels
width = 640, // outer width, in pixels
height = 400, // outer height, in pixels
maxWords = 250, // maximum number of words to extract from the text
fontFamily = "sans-serif", // font family
fontScale = 15, // base font size
padding = 0, // amount of padding between the words (in pixels)
rotate = 0, // a constant or function to rotate the words
invalidation // when this promise resolves, stop the simulation
} = {}) {
const words = typeof text === "string" ? text.split(/\W+/g) : Array.from(text);
const data = d3.rollups(words, size, w => w)
.sort(([, a], [, b]) => d3.descending(a, b))
.slice(0, maxWords)
.map(([key, size]) => ({text: word(key), size}));
const svg = d3.create("svg")
.attr("viewBox", [0, 0, width, height])
.attr("width", width)
.attr("font-family", fontFamily)
.attr("text-anchor", "middle")
.attr("style", "max-width: 100%; height: auto; height: intrinsic;");
const g = svg.append("g").attr("transform", `translate(${marginLeft},${marginTop})`);
const cloud = d3Cloud()
.size([width - marginLeft - marginRight, height - marginTop - marginBottom])
.words(data)
.padding(padding)
.rotate(rotate)
.font(fontFamily)
.fontSize(d => Math.sqrt(d.size) * fontScale)
.on("word", ({size, x, y, rotate, text}) => {
g.append("text")
.attr("font-size", size)
.attr("transform", `translate(${x},${y}) rotate(${rotate})`)
.text(text);
});
cloud.start();
invalidation && invalidation.then(() => cloud.stop());
return svg.node();
}
words = source.split(/[\s.]+/g)
.map(w => w.replace(/^[“‘"\-—()\[\]{}]+/g, ""))
.map(w => w.replace(/[;:.!?()\[\]{},"'’”\-—]+$/g, ""))
.map(w => w.replace(/['’]s$/g, ""))
.map(w => w.substring(0, 30))
.map(w => w.toLowerCase())
words.filter(w => /\W/.test(w))
d3Cloud = require("d3-cloud@1")
import {howto} from "@d3/example-components"
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
