D3 Examples - Brush Handles

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
svg {
  font: 10px sans-serif;
}
​
circle {
  -webkit-transition: fill-opacity 250ms linear;
}
​
.selecting circle {
  fill-opacity: .2;
}
​
.selecting circle.selected {
  stroke: #f00;
}
​
.resize path {
  fill: #666;
  fill-opacity: .8;
  stroke: #000;
  stroke-width: 1.5px;
}
​
.axis path, .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.brush .extent {
  fill-opacity: .125;
  shape-rendering: crispEdges;
  pointer-events:none;
}
​
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>
​
var data = d3.range(800).map(Math.random);
​
var margin = {top: 194, right: 50, bottom: 214, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
var x = d3.scale.linear()
    .range([0, width]);
​
var y = d3.random.normal(height / 2, height / 8);
​
var brush = d3.svg.brush()
    .x(x)
    .extent([.3, .5])
    .on("brushstart", brushstart)
    .on("brush", brushmove)
    .on("brushend", brushend);
​
var arc = d3.svg.arc()
    .outerRadius(height / 2)
    .startAngle(0)
    .endAngle(function(d, i) { return i ? -Math.PI : Math.PI; });
​
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .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 circle = svg.append("g").selectAll("circle")
    .data(data)
  .enter().append("circle")
    .attr("transform", function(d) { return "translate(" + x(d) + "," + y() + ")"; })
    .attr("r", 3.5);
​
var brushg = svg.append("g")
    .attr("class", "brush")
    .call(brush);
​
brushg.selectAll(".resize").append("path")
    .attr("transform", "translate(0," +  height / 2 + ")")
    .attr("d", arc);
​
brushg.selectAll("rect")
    .attr("height", height);
​
brushstart();
brushmove();
​
function brushstart() {
  svg.classed("selecting", true);
}
​
function brushmove() {
  var s = brush.extent();
  circle.classed("selected", function(d) { return s[0] <= d && d <= s[1]; });
}
​
function brushend() {
  svg.classed("selecting", !d3.event.target.empty());
}
​
</script>
​
    