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@vlandham
Forked from mbostock/.block
Created Jan 11, 2013
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What would you like to do?

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.

<!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="http://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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