D3.js: Panning with mouse wheel

This example demonstrate how to remap D3 events. MouseWheel event is used to pan the chart in x and y directions. This example was created as an answer to this SO question (Refer to it for detailed explanation).

<!DOCTYPE html>
<meta charset="utf-8">
<title>D3.js: Panning with mouse wheel</title>
<style>

.overlay {
  fill: none;
  pointer-events: all;
}

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

var width = 960,
    height = 500;

var randomX = d3.random.normal(width / 2, 80),
    randomY = d3.random.normal(height / 2, 80);

var data = d3.range(2000).map(function() {
  return [
    randomX(),
    randomY()
  ];
});
var zoomer = d3.behavior.zoom()
  .on("zoom", zoom)

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .call(zoomer)
      .on("wheel.zoom",pan)          
  .append("g");

svg.append("rect")
    .attr("class", "overlay")
    .attr("width", width)
    .attr("height", height);

svg.selectAll("circle")
    .data(data)
  .enter().append("circle")
    .attr("r", 2.5)
    .attr("transform", function(d) { return "translate(" + d + ")"; });

function zoom() {
    console.log(d3.select(this))
  svg.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
}

function pan() {
    current_translate = d3.transform(svg.attr("transform")).translate;
    dx = d3.event.wheelDeltaX + current_translate[0];
    dy = d3.event.wheelDeltaY + current_translate[1];
    
  svg.attr("transform", "translate(" + [dx,dy] + ")");
  d3.event.stopPropagation();
}

</script>

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

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