27:null 28:["$","title",null,{"children":"Modifying a Force-Directed Graph | LiangweiOIO | Observable"}] 2d:T4d7,viewof graph = { const form = html``; const graphs = {1: graph1, 2: graph2, 3: graph3}; const timeout = setInterval(() => { form.value = graphs[form.radio.value = (+form.radio.value) % 3 + 1]; form.dispatchEvent(new CustomEvent("input")); }, 2000); form.onchange = () => form.dispatchEvent(new CustomEvent("input")); // Safari form.oninput = event => { if (event.isTrusted) clearInterval(timeout), form.onchange = null; form.value = graphs[form.radio.value]; }; form.value = graphs[form.radio.value]; invalidation.then(() => clearInterval(timeout)); return form; }2e:T6e8,chart = { const svg = d3.create("svg") .attr("width", width) .attr("height", height) .attr("viewBox", [-width / 2, -height / 2, width, height]); const simulation = d3.forceSimulation() .force("charge", d3.forceManyBody().strength(-1000)) .force("link", d3.forceLink().id(d => d.id).distance(200)) .force("x", d3.forceX()) .force("y", d3.forceY()) .on("tick", ticked); let link = svg.append("g") .attr("stroke", "#000") .attr("stroke-width", 1.5) .selectAll("line"); let node = svg.append("g") .attr("stroke", "#fff") .attr("stroke-width", 1.5) .selectAll("circle"); function ticked() { node.attr("cx", d => d.x) .attr("cy", d => d.y) link.attr("x1", d => d.source.x) .attr("y1", d => d.source.y) .attr("x2", d => d.target.x) .attr("y2", d => d.target.y); } // Terminate the force layout when this cell re-runs. invalidation.then(() => simulation.stop()); return Object.assign(svg.node(), { update({nodes, links}) { // Make a shallow copy to protect against mutation, while // recycling old nodes to preserve position and velocity. const old = new Map(node.data().map(d => [d.id, d])); nodes = nodes.map(d => Object.assign(old.get(d.id) || {}, d)); links = links.map(d => Object.assign({}, d)); simulation.nodes(nodes); simulation.force("link").links(links); simulation.alpha(1).restart(); node = node .data(nodes, d => d.id) .join(enter => enter.append("circle") .attr("r", 8) .attr("fill", d => color(d.id))); link = link .data(links, d => `${d.source.id}\t${d.target.id}`) .join("line"); } }); }2f:[] 2b:{"id":"7d514bb4d323a324","slug":null,"title":"Modifying a Force-Directed Graph","thumbnail":"242ad260a3a16d56b9e9d9d3878dcb9bcedee42fff5b9d87c82bde23a332eaff","access_level":"public","create_time":"$D2023-03-29T10:53:18.669Z","update_time":"$D2023-03-29T11:01:02.135Z","view_time":null,"first_public_time":"$D2023-03-29T10:53:18.669Z","has_unpublished_edits":null,"fork":{"id":"8ed1d2f680151f48","slug":"modifying-a-force-directed-graph","title":"Modifying a Force-Directed Graph","owner":{"id":"863951e3ebe4c0ae","login":"d3","name":"D3"}},"stars":0,"starred":false,"owner":{"type":"team","id":"5b1f845af070d16a","login":"liangweioio","name":"LiangweiOIO","avatar_url":"https://avatars-next.observableusercontent.com/3b431401e188c19af0c2179ded1d97a2859f4388e4169e94bc8ebec04b269a41","tier":"starter_2024"},"version":136,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"d8b9f18ecdde6a17","login":"liangweioio","name":"LiangweiOIO","avatar_url":"https://avatars-next.observableusercontent.com/3b431401e188c19af0c2179ded1d97a2859f4388e4169e94bc8ebec04b269a41","tier":null}],"members":[{"type":"individual","id":"d8b9f18ecdde6a17","login":"liangweioio","name":"LiangweiOIO","avatar_url":"https://avatars-next.observableusercontent.com/3b431401e188c19af0c2179ded1d97a2859f4388e4169e94bc8ebec04b269a41","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"Modifying a Force-Directed Graph","cells":[{"id":0,"value":"md`# Modifying a Force-Directed Graph\n\nThis notebook demonstrates how to update a live [force-directed graph](/@d3/force-directed-graph). We use [*selection*.join](/@d3/selection-join) with a key function to add and remove elements as the graph changes; and we update the simulation’s nodes and links before restarting.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":15,"value":"$2d","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":25,"value":"$2e","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":29,"value":"update = chart.update(graph)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":5,"value":"graph1 = ({\n nodes: [\n {id: \"o\"},\n {id: \"a\"},\n {id: \"b\"},\n {id: \"c\"},\n {id: \"a1\"},\n {id: \"a2\"},\n {id: \"a3\"},\n {id: \"b1\"},\n {id: \"b2\"},\n {id: \"b3\"},\n {id: \"c1\"},\n {id: \"c2\"},\n {id: \"c3\"},\n ],\n links: []\n})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":7,"value":"graph2 = ({\n nodes: [\n {id: \"o\"},\n {id: \"a\"},\n {id: \"b\"},\n {id: \"c\"},\n \n {id: \"a1\"},\n {id: \"a2\"},\n {id: \"a3\"},\n {id: \"b1\"},\n {id: \"b2\"},\n {id: \"b3\"},\n {id: \"c1\"},\n {id: \"c2\"},\n {id: \"c3\"},\n ],\n links: [\n {source: \"o\", target: \"a\"},\n {source: \"o\", target: \"b\"},\n {source: \"o\", target: \"c\"},\n\n {source: \"a1\", target: \"a\"},\n {source: \"a2\", target: \"a\"},\n {source: \"a3\", target: \"a\"},\n\n {source: \"b1\", target: \"b\"},\n {source: \"b2\", target: \"b\"},\n {source: \"b3\", target: \"b\"},\n \n {source: \"c1\", target: \"c\"},\n {source: \"c2\", target: \"c\"},\n {source: \"c3\", target: \"c\"},\n ]\n})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":10,"value":"graph3 = ({\n nodes: [\n {id: \"a\"},\n {id: \"b\"}\n ],\n links: [\n {source: \"a\", target: \"b\"}\n ]\n})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":33,"value":"color = d3.scaleOrdinal(d3.schemeTableau10)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":21,"value":"height = 400","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W2f","stdlib":"1","titling":"auto"}} 2c:"$2b:body"