D3 Brush and Tooltip I

Example for Cooperative Brushing and Tooltips in D3.

Scatterplot only - no tooltips or brush.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.point {
  fill: #2f225d;
  stroke: #afa2dc;
}

.selected {
  fill: #afa2dc;
  stroke: #2f225d;
}

.axis {
  font: 10px sans-serif;
}

p {
  font: 12px sans-serif;
  margin: 0 0 2px 0;
  padding: 0;
}

.clear-button {
  font: 14px sans-serif;
  cursor: pointer;
}

.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="https://d3js.org/d3.v3.min.js"></script>
<script>

var data = [];
var values = [];
for (var i = 2; i <= 50; i++) {
    var val = Math.floor(Math.random() * (50 - 5 + 1) + 5);
    data.push({index: i, value: val});
    values.push(val);
}

var margin = {top: 20, right: 20, bottom: 60, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()
    .range([0, width])
    .domain([0, 50]);

var y = d3.scale.linear()
    .range([height, 0])
    .domain([0, d3.max(values) + 5]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(11);

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("clip-path", "url(#clip)")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g")
    .attr("class", "y axis")
    .call(yAxis);

points = svg.selectAll(".point")
    .data(data)
  .enter().append("circle")
    .attr("class", "point")
    .attr("clip-path", "url(#clip)")
    .attr("r", function(d){return Math.floor(Math.random() * (20 - 5 + 1) + 5);})
    .attr("cx", function(d) { return x(d.index); })
    .attr("cy", function(d) { return y(d.value); });

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js