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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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svg { |
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font: 10px sans-serif; |
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padding: 10px; |
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} |
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.axis, |
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.frame { |
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shape-rendering: crispEdges; |
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} |
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.axis line { |
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stroke: #ddd; |
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} |
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.axis path { |
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display: none; |
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} |
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.cell text { |
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font-weight: bold; |
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text-transform: capitalize; |
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fill: black; |
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} |
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.frame { |
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fill: none; |
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stroke: #aaa; |
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} |
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circle { |
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fill-opacity: .7; |
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} |
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circle.hidden { |
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fill: #ccc !important; |
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} |
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.extent { |
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fill: #000; |
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fill-opacity: .125; |
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stroke: #fff; |
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} |
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.contour { |
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stroke-width: 1.5; |
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} |
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</style> |
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<body> |
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<script src="https://d3js.org/d3.v4.min.js"></script> |
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<script src="https://d3js.org/d3-hexbin.v0.2.min.js"></script> |
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<script> |
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// Computes boundaries of connected triangles, given an array of triangles. |
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// Jason Davies - http://bl.ocks.org/jasondavies/1554783 |
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function boundary(mesh) { |
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console.log(mesh) |
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var counts = {}, |
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edges = {}, |
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r, |
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result = []; |
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// Traverse the edges of all triangles and discard any edges that appear twice. |
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mesh.forEach(function(triangle) { |
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for (var i = 0; i < 3; i++) { |
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var edge = [triangle[i], triangle[(i + 1) % 3]].sort(ascendingCoords).map(String); |
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(edges[edge[0]] = (edges[edge[0]] || [])).push(edge[1]); |
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(edges[edge[1]] = (edges[edge[1]] || [])).push(edge[0]); |
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var k = edge.join(":"); |
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if (counts[k]) delete counts[k]; |
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else counts[k] = 1; |
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} |
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}); |
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while (1) { |
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var k = null; |
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// Pick an arbitrary starting point on a boundary. |
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for (k in counts) break; |
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if (k == null) break; |
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result.push(r = k.split(":").map(function(d) { return d.split(",").map(Number); })); |
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delete counts[k]; |
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var q = r[1]; |
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while (q[0] !== r[0][0] || q[1] !== r[0][1]) { |
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var p = q, |
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qs = edges[p.join(",")], |
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n = qs.length; |
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for (var i = 0; i < n; i++) { |
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q = qs[i].split(",").map(Number); |
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var edge = [p, q].sort(ascendingCoords).join(":"); |
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if (counts[edge]) { |
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delete counts[edge]; |
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r.push(q); |
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break; |
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} |
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} |
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} |
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} |
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return result; |
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} |
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function ascendingCoords(a, b) { |
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return a[0] === b[0] ? b[1] - a[1] : b[0] - a[0]; |
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} |
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function alphashape(sites, alpha){ |
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var dsq = function(a,b) { |
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var dx = a[0]-b[0], dy = a[1]-b[1]; |
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return dx*dx+dy*dy; |
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}, |
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asq = alpha*alpha, |
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sites2 = |
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d3.hexbin().radius(3)(sites) |
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.map(d => [d.x + 0.01 * (Math.random() - Math.random()), d.y + 0.01 * (Math.random() - Math.random())]) |
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, |
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mesh = d3.voronoi() |
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.triangles(sites2) |
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.filter(function(t) { |
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return dsq(t[0],t[1]) < asq && dsq(t[0],t[2]) < asq && dsq(t[1],t[2]) < asq; |
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}); |
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//mesh = mesh.map(d => d.map(e => e.map((Math.round)))) |
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return boundary(mesh); |
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} |
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function encircle_path(points) { |
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var a = alphashape(points, 60); |
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return a.map(d => d ? "M" + d.join(',') : null) |
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} |
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var width = 960, |
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size = 230, |
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padding = 20; |
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var x = d3.scaleLinear() |
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.range([padding / 2, size - padding / 2]); |
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var y = d3.scaleLinear() |
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.range([size - padding / 2, padding / 2]); |
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var xAxis = d3.axisBottom() |
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.scale(x) |
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.ticks(6); |
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var yAxis = d3.axisLeft() |
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.scale(y) |
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.ticks(6); |
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var color = d3.scaleOrdinal(d3.schemeCategory10); |
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d3.csv("flowers.csv", function(error, data) { |
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if (error) throw error; |
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var domainByTrait = {}, |
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traits = d3.keys(data[0]).filter(function(d) { return d !== "species"; }), |
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n = traits.length; |
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traits.forEach(function(trait) { |
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domainByTrait[trait] = d3.extent(data, function(d) { return d[trait]; }); |
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}); |
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xAxis.tickSize(size * n); |
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yAxis.tickSize(-size * n); |
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var brush = d3.brush() |
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.on("start", brushstart) |
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.on("brush", brushmove) |
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.on("end", brushend) |
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.extent([[0,0],[size,size]]); |
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var svg = d3.select("body").append("svg") |
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.attr("width", size * n + padding) |
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.attr("height", size * n + padding) |
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.append("g") |
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.attr("transform", "translate(" + padding + "," + padding / 2 + ")"); |
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svg.selectAll(".x.axis") |
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.data(traits) |
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.enter().append("g") |
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.attr("class", "x axis") |
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.attr("transform", function(d, i) { return "translate(" + (n - i - 1) * size + ",0)"; }) |
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.each(function(d) { x.domain(domainByTrait[d]); d3.select(this).call(xAxis); }); |
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svg.selectAll(".y.axis") |
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.data(traits) |
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.enter().append("g") |
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.attr("class", "y axis") |
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.attr("transform", function(d, i) { return "translate(0," + i * size + ")"; }) |
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.each(function(d) { y.domain(domainByTrait[d]); d3.select(this).call(yAxis); }); |
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var cell = svg.selectAll(".cell") |
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.data(cross(traits, traits)) |
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.enter().append("g") |
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.attr("class", "cell") |
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.attr("transform", function(d) { return "translate(" + (n - d.i - 1) * size + "," + d.j * size + ")"; }) |
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.each(plot); |
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// Titles for the diagonal. |
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cell.filter(function(d) { return d.i === d.j; }).append("text") |
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.attr("x", padding) |
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.attr("y", padding) |
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.attr("dy", ".71em") |
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.text(function(d) { return d.x; }); |
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cell.call(brush); |
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function plot(p) { |
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var cell = d3.select(this); |
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x.domain(domainByTrait[p.x]); |
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y.domain(domainByTrait[p.y]); |
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cell.append("rect") |
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.attr("class", "frame") |
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.attr("x", padding / 2) |
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.attr("y", padding / 2) |
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.attr("width", size - padding) |
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.attr("height", size - padding); |
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cell.selectAll("circle") |
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.data(data) |
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.enter().append("circle") |
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.attr("cx", function(d) { return x(d[p.x]); }) |
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.attr("cy", function(d) { return y(d[p.y]); }) |
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.attr("r", 4) |
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.style("fill", function(d) { return color(d.species); }); |
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var contours = d3.nest().key(d => d.species).entries(data) |
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.map(d => { |
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d.path = encircle_path(d.values.map(d => [x(d[p.x]) + Math.random(), y(d[p.y])])); |
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return d; |
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}) |
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cell.selectAll("path.contour") |
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.data(contours, d => d.key) |
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.enter() |
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.append('path') |
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.classed("contour", true) |
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.attr('d', d => d.path) |
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.attr('stroke', d => color(d.key)) |
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.attr('fill', d => color(d.key)) |
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.attr('fill-opacity', 0.3) |
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} |
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var brushCell; |
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// Clear the previously-active brush, if any. |
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function brushstart(p) { |
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if (brushCell !== this) { |
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d3.select(brushCell).call(brush.move, null); |
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brushCell = this; |
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x.domain(domainByTrait[p.x]); |
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y.domain(domainByTrait[p.y]); |
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} |
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} |
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// Highlight the selected circles. |
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function brushmove(p) { |
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var e = d3.brushSelection(this); |
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svg.selectAll("circle").classed("hidden", function(d) { |
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return !e |
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? false |
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: ( |
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e[0][0] > x(+d[p.x]) || x(+d[p.x]) > e[1][0] |
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|| e[0][1] > y(+d[p.y]) || y(+d[p.y]) > e[1][1] |
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); |
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}); |
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var con = cell.selectAll("path.contour") |
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.data((d,i,e) => { |
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var c = d3.select(e[i]).selectAll('circle:not(.hidden)'); |
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var p = d3.select(e[i]).data()[0]; |
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x.domain(domainByTrait[p.x]); |
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y.domain(domainByTrait[p.y]); |
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return d3.nest() |
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.key(d => d.species) |
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.entries(c.data()) |
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.map(d => { |
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d.path = encircle_path(d.values.map(d => [x(d[p.x]) + Math.random(), y(d[p.y])])); |
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return d; |
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}) |
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}, d => d.key) |
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.attr('d', d => d.path) |
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x.domain(domainByTrait[p.x]); |
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y.domain(domainByTrait[p.y]); |
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con.exit().attr('d', null) |
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} |
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// If the brush is empty, select all circles. |
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function brushend() { |
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var e = d3.brushSelection(this); |
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if (e === null) svg.selectAll(".hidden").classed("hidden", false); |
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} |
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}); |
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function cross(a, b) { |
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var c = [], n = a.length, m = b.length, i, j; |
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for (i = -1; ++i < n;) for (j = -1; ++j < m;) c.push({x: a[i], i: i, y: b[j], j: j}); |
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return c; |
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} |
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</script> |
