2b:null 2c:["$","title",null,{"children":"Walmart’s Growth | Russell Samora | Observable"}] 31:T57c,chart = { const svg = d3.create("svg") .attr("viewBox", [0, 0, 960, 600]); const zoom = d3.zoom() .scaleExtent([1, 8]) .on("zoom", zoomed); svg.call(zoom); svg.append("path") .datum(topojson.merge(us, us.objects.lower48.geometries)) .attr("fill", "#ddd") .attr("d", d3.geoPath()); svg.append("path") .datum(topojson.mesh(us, us.objects.lower48, (a, b) => a !== b)) .attr("fill", "none") .attr("stroke", "white") .attr("stroke-linejoin", "round") .attr("d", d3.geoPath()); const g = svg.append("g") .attr("fill", "none") .attr("stroke", "black"); const dot = g.selectAll("circle") .data(data) .join("circle") .attr("transform", d => `translate(${d})`); svg.append("circle") .attr("fill", "blue") .attr("transform", `translate(${data[0]})`) .attr("r", 3); let previousDate = -Infinity; function zoomed(event) { const {transform} = event; svg.attr("transform", transform); svg.attr("stroke-width", 1 / transform.k); } return Object.assign(svg.node(), { update(date) { dot // enter .filter(d => d.date > previousDate && d.date <= date) .transition().attr("r", 3); dot // exit .filter(d => d.date <= previousDate && d.date > date) .transition().attr("r", 0); previousDate = date; } }); }32:[{"id":"ce607f28cac52d17fe11f7a2dcff0a21c3b74465957841bc8ac390b900fae923b824a86762af12f1a96e0213d613636092a65c611bd6b256b4e729106d4612fe","href":"https://static.observableusercontent.com/files/ce607f28cac52d17fe11f7a2dcff0a21c3b74465957841bc8ac390b900fae923b824a86762af12f1a96e0213d613636092a65c611bd6b256b4e729106d4612fe","name":"walmart.tsv","type":"text/tab-separated-values","lastModified":1677001678890.538,"size":99253}] 2f:{"id":"16f2434edd1d7253","slug":null,"title":"Walmart’s Growth","thumbnail":"ca9cbff9f2e89d662792daabdf60db41a05196f6ab9323e69896be6e6ec0e815","access_level":"public","create_time":"$D2023-02-21T17:47:58.890Z","update_time":"$D2023-02-21T17:49:18.007Z","view_time":null,"first_public_time":"$D2023-02-21T17:47:58.890Z","has_unpublished_edits":null,"fork":{"id":"9fc7a290cf64994b","slug":"walmarts-growth","title":"Walmart’s growth","owner":{"id":"863951e3ebe4c0ae","login":"d3","name":"D3"}},"stars":0,"starred":false,"owner":{"type":"team","id":"6166fda182072050","login":"russellsamora","name":"Russell Samora","avatar_url":"https://avatars-next.observableusercontent.com/66209178c9902514b55efccbcb321e9a22b0eac36d49b9602ab600eb329db3a3","tier":"starter_2024"},"version":336,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"c8ac2186d9142520","login":"russellsamora","name":"Russell Samora","avatar_url":"https://avatars-next.observableusercontent.com/66209178c9902514b55efccbcb321e9a22b0eac36d49b9602ab600eb329db3a3","tier":null}],"members":[{"type":"individual","id":"c8ac2186d9142520","login":"russellsamora","name":"Russell Samora","avatar_url":"https://avatars-next.observableusercontent.com/66209178c9902514b55efccbcb321e9a22b0eac36d49b9602ab600eb329db3a3","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":1,"collection":null,"type":"notebook","body":{"title":"Walmart’s Growth","cells":[{"id":0,"value":"md`# Walmart’s Growth\n\nThis animation shows the expansion of Walmart over the last fifty years. On July 2, 1962 in [Rogers, Arkansas](https://en.wikipedia.org/wiki/Rogers,_Arkansas), the first Walton’s opened. [This dataset](http://users.econ.umn.edu/~holmes/data/WalMart/index.html) from 2006 includes about 3,100 Walmart locations in the continguous United States.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":288,"value":"viewof date = Scrubber(d3.utcWeek.every(2).range(...d3.extent(data, d => d.date)), {format: d3.utcFormat(\"%Y %b %-d\"), loop: false})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":14,"value":"$31","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":296,"value":"update = chart.update(date)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":16,"value":"data = (await FileAttachment(\"walmart.tsv\").tsv())\n .map(d => {\n const p = projection(d);\n p.date = parseDate(d.date);\n return p;\n })\n .sort((a, b) => a.date - b.date)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":275,"value":"parseDate = d3.utcParse(\"%m/%d/%Y\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":279,"value":"projection = d3.geoAlbersUsa().scale(1280).translate([480, 300])","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":8,"value":"us = {\n const us = await d3.json(\"https://cdn.jsdelivr.net/npm/us-atlas@1/us/10m.json\");\n us.objects.lower48 = {\n type: \"GeometryCollection\",\n geometries: us.objects.states.geometries.filter(d => d.id !== \"02\" && d.id !== \"15\")\n };\n return us;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"topojson = require(\"topojson-client@3\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":283,"value":"import {Scrubber} from \"@mbostock/scrubber\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W32","stdlib":"1","titling":"auto"}} 30:"$2f:body"