Brushing makes more sense for quantitative dimensions. It’s possible to use a brush to select categorical values, as shown here, though I’d recommend using per-value toggles instead. This way, users can pick arbitrary sets of values, rather than being forced to pick contiguous ranges.
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Ordinal Brushing
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/ordinal-brushing |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| svg { | |
| font: 10px sans-serif; | |
| } | |
| path { | |
| -webkit-transition: fill-opacity 250ms linear; | |
| } | |
| .selecting path { | |
| fill-opacity: .2; | |
| } | |
| .selecting path.selected { | |
| stroke: #f00; | |
| stroke-width: 2px; | |
| } | |
| .axis path, .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .brush .extent { | |
| stroke: #fff; | |
| fill-opacity: .125; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var data = d3.svg.symbolTypes; | |
| var margin = {top: 210, right: 10, bottom: 210, left: 10}, | |
| width = 960 - margin.right - margin.left, | |
| height = 500 - margin.top - margin.bottom; | |
| var x = d3.scale.ordinal() | |
| .domain(data) | |
| .rangePoints([0, width], 1); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.right + margin.left) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(d3.svg.axis().scale(x).orient("bottom")); | |
| var symbol = svg.append("g").selectAll("path") | |
| .data(data) | |
| .enter().append("path") | |
| .attr("transform", function(d) { return "translate(" + x(d) + "," + (height / 2) + ")"; }) | |
| .attr("d", d3.svg.symbol().type(String).size(200)); | |
| svg.append("g") | |
| .attr("class", "brush") | |
| .call(d3.svg.brush().x(x) | |
| .on("brushstart", brushstart) | |
| .on("brush", brushmove) | |
| .on("brushend", brushend)) | |
| .selectAll("rect") | |
| .attr("height", height); | |
| function brushstart() { | |
| svg.classed("selecting", true); | |
| } | |
| function brushmove() { | |
| var s = d3.event.target.extent(); | |
| symbol.classed("selected", function(d) { return s[0] <= (d = x(d)) && d <= s[1]; }); | |
| } | |
| function brushend() { | |
| svg.classed("selecting", !d3.event.target.empty()); | |
| } | |
| </script> |
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