2e:null 2f:["$","title",null,{"children":"D3 Horizon Chart with transitions | John Clarke | Observable"}] 34:T5dc, chart = { let el = this if (!el) { el = DOM.svg(width, height) const svg = d3.select(el) svg.style("font", "10px sans-serif"); el.g = svg.append("g") .selectAll("g") .data(data) .enter().append("g") .attr("class", "chart-band-container") .attr("transform", (d, i) => `translate(0,${i * (step + 1) + margin.top})`); el.g.append("clipPath") .attr("id", d => (d.clip = DOM.uid("clip")).id) .append("rect") .attr("width", width) .attr("height", step); el.g.append("defs").append("path") .attr('class', 'area') .attr("id", d => (d.path = DOM.uid("path")).id) .attr("d", d => area(d.values)); el.g.append("g") .attr('class', 'area-container') .attr("clip-path", d => d.clip) .selectAll("use") .data(d => new Array(overlap).fill(d)) .enter().append("use") .attr("fill", (d, i) => color(i)) .attr("transform", (d, i) => `translate(0,${(i + 1) * step})`) .attr("xlink:href", d => d.path.href); el.g.append("text") .attr("class", 'label') .attr("x", 4) .attr("y", step / 2) .attr("dy", "0.35em") .text(d => d.key); svg.append("g") .call(xAxis) } else { //var debounce_wait = duration==0 ? 0 : 500; //console.log(debounce_wait) // debouncing to avoid transition collisions from too many slider events updateChart() } return el; }35:[] 32:{"id":"bdf744850ca73dfe","slug":"d3-horizon-chart-with-transitions","title":"D3 Horizon Chart with transitions","thumbnail":"1a9f2c7e57a31fcb0df19ebbf26f956f7462b1193125ce048f0a602d69a4bbde","access_level":"public","create_time":"$D2018-07-04T16:15:47.702Z","update_time":"$D2018-10-05T14:08:53.219Z","view_time":null,"first_public_time":"$D2018-07-05T14:39:29.543Z","has_unpublished_edits":null,"fork":true,"stars":11,"starred":false,"owner":{"type":"team","id":"d6f4905fa7e2825f","login":"john-clarke","name":"John Clarke","avatar_url":"https://avatars-next.observableusercontent.com/797cc850d46c4253e2b916cc5916cf130bc41038c773f98bbc26dcfdd8adbe13","tier":"starter_2024"},"version":431,"publish_version":431,"role":null,"authored":false,"authors":[{"type":"individual","id":"7aed0ff5358d0dad","login":"john-clarke","name":"John Clarke","avatar_url":"https://avatars-next.observableusercontent.com/797cc850d46c4253e2b916cc5916cf130bc41038c773f98bbc26dcfdd8adbe13","tier":null}],"members":[{"type":"individual","id":"7aed0ff5358d0dad","login":"john-clarke","name":"John Clarke","avatar_url":"https://avatars-next.observableusercontent.com/797cc850d46c4253e2b916cc5916cf130bc41038c773f98bbc26dcfdd8adbe13","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":8,"collection":null,"type":"notebook","body":{"title":"D3 Horizon Chart with transitions","cells":[{"id":0,"value":"md`# D3 Horizon Chart with transitions\n\n[D3 Horizon chart](/@mbostock/d3-horizon-chart) with transitions.\nHorizon charts are an alternative to [ridgeline plots](/@mbostock/d3-ridgeline-plot) and small-multiple area charts that allow greater precision for a given vertical space by using colored bands. These charts can also be used with diverging color scales to [differentiate positive and negative values](/@mbostock/d3-horizon-chart-ii).\n\nTheory behind horizon charts: [Sizing the Horizon: The Effects of Chart Size and Layering\non the Graphical Perception of Time Series Visualizations](https://idl.cs.washington.edu/files/2009-TimeSeries-CHI.pdf)\n\nData: [Moritz Klack](/@moklick)`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":370,"value":"viewof step = slider({\n min: 25, \n max: 100, \n step: 1, \n value: 23, \n title: \"Band height (px)\",\n cautious: true,\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":159,"value":"viewof overlap = slider({\n min: 1, \n max: d3.schemeBlues.length - 1, \n step: 1, \n value: 7, \n title: \"Overlap\", \n cautious: true\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":285,"value":"viewof scheme = html``","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":368,"value":"viewof duration = slider({\n min: 0, \n max: 2000, \n step: 100, \n value: 1000, \n title: \"Duration (ms)\",\n format: \",\",\n cautious: true\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":14,"value":"$34","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":366,"value":"updateChart = function(){\n \n const t = d3.transition().duration(duration);\n \n const update = d3.select('svg')\n console.log(update)\n // Maybe there is a better way to update akin to DOM.svg(width, height)\n update\n .attr('viewBox', `0,0,${width},${height}`)\n .attr('height', height)\n\n update.selectAll('.area')\n .transition(t)\n .attr(\"d\", d => area(d.values))\n\n update.selectAll('.chart-band-container')\n .transition(t)\n .attr(\"transform\", (d, i) => `translate(0,${i * (step + 1) + margin.top})`);\n\n update.selectAll(\"clipPath rect\")\n .transition(t)\n .attr(\"height\", step);\n\n update.selectAll('.area-container')\n .attr(\"clip-path\", d => d.clip)\n .selectAll(\"use\")\n .transition(t)\n .attr(\"transform\", (d, i) => `translate(0,${(i + 1) * step})`)\n .attr(\"fill\", function(d, i){return color(i)})\n\n update.selectAll('.label')\n .transition(t)\n .attr(\"y\", step / 2)\n\n }","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":43,"value":"height = data.length * (step + 1) + margin.top + margin.bottom","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":45,"value":"margin = ({top: 30, right: 10, bottom: 0, left: 10})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":234,"value":"color = i => d3[scheme][Math.max(3, overlap)][i + Math.max(0, 3 - overlap)]","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":392,"value":"[data[0].values[0].date, data[0].values[data[0].values.length - 1].date]\n","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":38,"value":"x = d3.scaleUtc()\n .domain([data[0].values[0].date, data[0].values[data[0].values.length - 1].date])\n .range([0, width])","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":67,"value":"y = d3.scaleLinear()\n .domain([0, d3.max(data, d => d3.max(d.values, d => d.value))])\n .range([0, -overlap * step])","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":52,"value":"xAxis = g => g\n .attr(\"transform\", `translate(0,${margin.top})`)\n .call(d3.axisTop(x).ticks(width / 80).tickSizeOuter(0))\n .call(g => g.selectAll(\".tick\").filter(d => x(d) < margin.left || x(d) >= width - margin.right).remove())\n .call(g => g.select(\".domain\").remove())","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":57,"value":"area = d3.area()\n .curve(d3.curveBasis)\n .defined(d => !isNaN(d.value))\n .x(d => x(d.date))\n .y0(0)\n .y1(d => y(d.value))","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":5,"value":"data = {\n const data = await d3.csv(\"https://gist.githubusercontent.com/chrtze/c74efb46cadb6a908bbbf5227934bfea/raw/c32d94689dd432609c55d1758d8e69c59f94f802/traffic_weekly.csv\", ({name, date, total_1, total_2}) => ({name, date: new Date(date * 1000), value: +total_1 + +total_2}));\n return d3.nest()\n .key(d => d.name)\n .sortValues((a, b) => a.date - b.date)\n .entries(data)\n .map(d => (d.sum = d3.sum(d.values, d => d.value), d))\n .sort((a, b) => b.sum - a.sum);\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":7,"value":"d3 = require(\"d3@5\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":361,"value":"import {slider} from \"@tmcw/inputs/2\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":363,"value":"_ = require(\"lodash\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W35","stdlib":"1","titling":"auto"}} 33:"$32:body"