<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<title>Brush</title>
<script type="text/javascript" src="../../d3.js"></script>
<style type="text/css">
svg {
font: 10px sans-serif;
}
circle {
-webkit-transition: fill-opacity 250ms linear;
}
.selecting circle {
fill-opacity: .2;
}
.selecting circle.selected {
stroke: #f00;
}
.axis path, .axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.brush .extent {
stroke: #fff;
fill-opacity: .125;
shape-rendering: crispEdges;
}
</style>
</head>
<body>
<script type="text/javascript">
var data = d3.range(800).map(Math.random);
var m = [10, 10, 20, 10],
w = 960 - m[1] - m[3],
h = 100 - m[0] - m[2];
var x = d3.scale.linear().range([0, w]),
y = d3.random.normal(h / 2, h / 8);
var svg = d3.select("body").append("svg:svg")
.attr("width", w + m[1] + m[3])
.attr("height", h + m[0] + m[2])
.append("svg:g")
.attr("transform", "translate(" + m[3] + "," + m[0] + ")");
svg.append("svg:g")
.attr("class", "x axis")
.attr("transform", "translate(0," + h + ")")
.call(d3.svg.axis().scale(x).orient("bottom"));
var circle = svg.selectAll("circle")
.data(data)
.enter().append("svg:circle")
.attr("transform", function(d) { return "translate(" + x(d) + "," + y() + ")"; })
.attr("r", 3.5);
svg.append("svg:g")
.attr("class", "brush")
.call(d3.svg.brush().x(x)
.on("brushstart", brushstart)
.on("brush", brush)
.on("brushend", brushend))
.selectAll("rect")
.attr("height", h);
function brushstart() {
svg.classed("selecting", true);
}
function brush() {
var s = d3.event.target.extent();
circle.classed("selected", function(d) { return s[0] <= d && d < s[1]; });
}
function brushend() {
svg.classed("selecting", !d3.event.target.empty());
}
</script>
</body>
</html>