Example representing Chicago wards as a cartogram, boundaries, and bar chart with path tween transitions. Using a modified version of the Wall Street Journal's Squaire library and MinnPost's aRanger to produce the cartogram layout.
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Chicago Ward Shape Transitions
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| license: mit | |
| height: 800 | |
| border: no |
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| .DS_Store |
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| license: mit |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>D3 Maps</title> | |
| <meta name="viewport" content="initial-scale=1.0, user-scalable=no" /> | |
| <meta charset='utf-8' /> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-queue.v3.min.js"></script> | |
| <script src="http://d3js.org/colorbrewer.v1.min.js"></script> | |
| <style> | |
| * { | |
| font-family: "Verdana"; | |
| font-size: 10; | |
| } | |
| #container { | |
| margin-left: 15px; | |
| margin-top: 15px; | |
| } | |
| #map-container { | |
| display: block; | |
| } | |
| path { | |
| stroke: black; | |
| stroke-width: 0.3; | |
| } | |
| g text { | |
| alignment-baseline: central; | |
| text-anchor: middle; | |
| font-size: 10px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="container"> | |
| <input name="toWards" | |
| type="button" | |
| value="To Wards" | |
| onclick="toWards()" /> | |
| <input name="toSquares" | |
| type="button" | |
| value="To Squares" | |
| onclick="toSquares()" /> | |
| <input name="toBars" | |
| type="button" | |
| value="To Bars" | |
| onclick="toBars()" /> | |
| <svg id="map-container"></svg> | |
| </div> | |
| <script src="script.js"></script> | |
| </body> | |
| </html> |
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| // Pulled from cartograms/chi_ward_cartogram_layout.json | |
| // Created with http://code.minnpost.com/aranger/ and Squaire WSJ library | |
| var chi_ward_layout = [[0,0,"41"],[3,0,"50"],[4,0,"49"],[1,1,"45"],[2,1,"39"],[3,1,"40"],[4,1,"48"],[0,2,"38"],[1,2,"30"],[2,2,"35"],[3,2,"33"],[4,2,"47"],[5,2,"46"],[1,3,"29"],[2,3,"36"],[3,3,"31"],[4,3,"32"],[5,3,"44"],[2,4,"37"],[3,4,"26"],[4,4,"1"],[5,4,"2"],[6,4,"43"],[3,5,"24"],[4,5,"28"],[5,5,"27"],[6,5,"42"],[3,6,"22"],[4,6,"12"],[5,6,"25"],[6,6,"11"],[1,7,"23"],[2,7,"14"],[3,7,"16"],[4,7,"15"],[5,7,"20"],[6,7,"3"],[7,7,"4"],[2,8,"13"],[3,8,"18"],[4,8,"17"],[5,8,"21"],[6,8,"6"],[7,8,"5"],[4,9,"19"],[5,9,"34"],[6,9,"8"],[7,9,"7"],[6,10,"9"],[7,10,"10"]]; | |
| var SQ_SIZE = 50; | |
| var ease = d3.easeQuadInOut; | |
| var transitionTime = 500; | |
| var transitionDelay = 15; | |
| var projection, path, geoData, centered, maxData, svg; | |
| var active = d3.select(null); | |
| // Margin convention from https://bl.ocks.org/mbostock/3019563 | |
| var margin = {top: 20, right: 10, bottom: 20, left: 10}; | |
| var width = 550 - margin.left - margin.right; | |
| var height = 650 - margin.top - margin.bottom; | |
| var svg = d3.select("#map-container") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| function convertRectPath(x, y, w, h) { | |
| return "M" + [[x,y], [x+w,y], [x+w, y+h], [x, y+h], [x,y]].join("L"); | |
| } | |
| // Pulled from Mike Bostock example here: https://bl.ocks.org/mbostock/3916621 | |
| // Example without continuous update: http://bl.ocks.org/sarahob/707cb381d48f57abba57 | |
| function pathTween(d1, precision) { | |
| return function() { | |
| var path0 = this, | |
| path1 = path0.cloneNode(), | |
| n0 = path0.getTotalLength(), | |
| n1 = (path1.setAttribute("d", d1), path1).getTotalLength(); | |
| // Uniform sampling of distance based on specified precision. | |
| var distances = [0], i = 0, dt = precision / Math.max(n0, n1); | |
| while ((i += dt) < 1) distances.push(i); | |
| distances.push(1); | |
| // Compute point-interpolators at each distance. | |
| var points = distances.map(function(t) { | |
| var p0 = path0.getPointAtLength(t * n0), | |
| p1 = path1.getPointAtLength(t * n1); | |
| return d3.interpolate([p0.x, p0.y], [p1.x, p1.y]); | |
| }); | |
| return function(t) { | |
| return t < 1 ? "M" + points.map(function(p) { return p(t); }).join("L") : d1; | |
| }; | |
| }; | |
| } | |
| // Zoom to ward on click, pulled from https://bl.ocks.org/mbostock/4699541 | |
| function reset() { | |
| active.classed("active", false); | |
| active = d3.select(null); | |
| svg.transition() | |
| .duration(transitionTime) | |
| .style("stroke-width", "1.5px") | |
| .attr("transform", ""); | |
| } | |
| function clicked(d) { | |
| if (active.node() === this) return reset(); | |
| active.classed("active", false); | |
| active = d3.select(this).classed("active", true); | |
| var bounds = path.bounds(d), | |
| dx = bounds[1][0] - bounds[0][0], | |
| dy = bounds[1][1] - bounds[0][1], | |
| x = (bounds[0][0] + bounds[1][0]) / 2, | |
| y = (bounds[0][1] + bounds[1][1]) / 2, | |
| scale = .9 / Math.max(dx / width, dy / height), | |
| translate = [width / 2 - scale * x, height / 2 - scale * y]; | |
| svg.transition() | |
| .duration(transitionTime) | |
| .style("stroke-width", 1.5 / scale + "px") | |
| .attr("transform", "translate(" + translate + ")scale(" + scale + ")"); | |
| } | |
| function transitionShapes(el, idx, tween){ | |
| d3.select(el) | |
| .transition() | |
| .delay(idx*transitionDelay) | |
| .duration(transitionTime) | |
| .ease(ease) | |
| .attrTween('d', pathTween(tween, 5)); | |
| } | |
| function drawCartogram(el, data, w, h){ | |
| var color = d3.scaleQuantize().domain([0,maxData]).range(colorbrewer['OrRd'][5]); | |
| var g = el.append("g"); | |
| g.selectAll("path") | |
| .data(data) | |
| .enter().append("path") | |
| .attr("d", function(d){return convertRectPath(d.x*w, d.y*h, w, h);}) | |
| .attr("fill", function(d){return color(d.val);}); | |
| var textG = el.append("g"); | |
| textG.selectAll("text") | |
| .data(data) | |
| .enter().append("text") | |
| .attr("x", function(d) { return (d.x*w)+(w/2); }) | |
| .attr("y", function(d) { return (d.y*h)+(h/2); }) | |
| .text(function(d){ return d.properties.ward; }); | |
| }; | |
| function toWards() { | |
| if (centered) { | |
| clicked(); | |
| } | |
| svg.selectAll("g path") | |
| .style("opacity", "1") | |
| .each(function(d, i) { transitionShapes(this, i, path(d)); }) | |
| .on("click", clicked); | |
| svg.selectAll("g text") | |
| .transition() | |
| .delay(function(d, i) { return i*transitionDelay; }) | |
| .duration(transitionTime) | |
| .ease(ease) | |
| .attr("x", function(d) { return path.centroid(d)[0]; }) | |
| .attr("y", function(d) { return path.centroid(d)[1]; }); | |
| } | |
| function toSquares() { | |
| if (centered) { | |
| clicked(); | |
| } | |
| svg.selectAll("g path") | |
| .each(function(d, i) { transitionShapes(this, i, convertRectPath(d.x*SQ_SIZE, d.y*SQ_SIZE, SQ_SIZE, SQ_SIZE)); }) | |
| .on("click", null); | |
| svg.selectAll("g text") | |
| .transition() | |
| .delay(function(d, i) { return i*transitionDelay; }) | |
| .duration(transitionTime) | |
| .ease(ease) | |
| .attr("x", function(d) { return (d.x*SQ_SIZE)+(SQ_SIZE/2); }) | |
| .attr("y", function(d) { return (d.y*SQ_SIZE)+(SQ_SIZE/2); }); | |
| } | |
| function toBars() { | |
| if (centered) { | |
| clicked(); | |
| } | |
| var y = d3.scaleLinear().range([width-50, 0]); | |
| var x = d3.scaleBand().rangeRound([0, height], .1); | |
| y.domain([0, maxData]); | |
| x.domain(geoData.map(function(d) { return d.properties.ward; })); | |
| svg.selectAll("g path") | |
| .each(function(d, i) { | |
| transitionShapes(this, i, convertRectPath(25, x(d.properties.ward), width-y(d.val), x.bandwidth())); | |
| }) | |
| .on("click", null); | |
| svg.selectAll("g text") | |
| .transition() | |
| .delay(function(d, i) { return i*transitionDelay; }) | |
| .duration(transitionTime) | |
| .ease(ease) | |
| .attr("x", 10) | |
| .attr("y", function(d) { return x(d.properties.ward)+(x.bandwidth()/2); }); | |
| } | |
| (function() { | |
| projection = d3.geoMercator().scale(1).translate([0,0]); | |
| path = d3.geoPath().projection(projection); | |
| d3.queue() | |
| .defer(d3.json, "chi_wards_calls.geojson") | |
| .await(function(error, json) { | |
| var bounds = path.bounds(json); | |
| var s = 0.95 / Math.max((bounds[1][0] - bounds[0][0]) / width, (bounds[1][1] - bounds[0][1]) / height); | |
| var t = [(width - s * (bounds[1][0] + bounds[0][0])) / 2, (height - s * (bounds[1][1] + bounds[0][1])) / 2]; | |
| projection.scale(s).translate(t); | |
| maxData = d3.max(json.features, function(d) { return d.properties.wib_calls; }); | |
| geoData = json.features.map(function(d) { | |
| var wardRow = chi_ward_layout.filter(function(w) { return w[2] === d.properties.ward; }); | |
| if (wardRow.length) { | |
| d.x = wardRow[0][0]; | |
| d.y = wardRow[0][1]; | |
| d.val = d.properties.wib_calls; | |
| } | |
| return d; | |
| }); | |
| // Sort on ward strings | |
| geoData = geoData.sort(function(a, b) { | |
| a = parseInt(a.properties.ward); | |
| b = parseInt(b.properties.ward); | |
| if (a < b) { | |
| return -1; | |
| } | |
| else if (a > b) { | |
| return 1; | |
| } | |
| return 0; | |
| }); | |
| drawCartogram(svg, geoData, SQ_SIZE, SQ_SIZE); | |
| }); | |
| })() |
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