Scatter plot with zoom

Scatter plot zoom of the brushed region. Double-click to zoom out.

<!DOCTYPE html>
<meta charset="utf-8">
<p id="g1"></p>
<head>
    <style>
        body {
            font-family: "Helvetica Neue", Helvetica, sans-serif;
            font-size: 14px;
        }
             
    </style>
</head>
<body>

// Create data
        function randomData(samples) {
            var data = [],
                random = d3.randomNormal();
                
            for (i = 0; i < samples; i++) {
                data.push({
                    x: random(),
                    y: random()
                });
            }
            return data;
        }

var data = randomData(300);

var margin = { top: 20, right: 20, bottom: 30, left: 30 };
        width = 900 - margin.left - margin.right,
        height = 480 - margin.top - margin.bottom;

var tooltip = d3.select("body").append("div")
            .attr("class", "tooltip")
            .style("opacity", 0);

var x = d3.scaleLinear()          
              .range([0, width])
              .nice();

var y = d3.scaleLinear()
            .range([height, 0]);

var xAxis = d3.axisBottom(x).ticks(12),
            yAxis = d3.axisLeft(y).ticks(12 * height / width);

var brush = d3.brush().extent([[0, 0], [width, height]]).on("end", brushended),
            idleTimeout,
            idleDelay = 350;
     
        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 + ")");

var clip = svg.append("defs").append("svg:clipPath")
            .attr("id", "clip")
            .append("svg:rect")
            .attr("width", width )
            .attr("height", height )
            .attr("x", 0) 
            .attr("y", 0);

var scatter = svg.append("g")
             .attr("id", "scatterplot")
             .attr("clip-path", "url(#clip)");
            
        scatter.selectAll(".dot")
            .data(data)
          .enter().append("circle")
            .attr("class", "dot")
            .attr("r", 4)
            .attr("cx", function (d) { return x(d.x); })
            .attr("cy", function (d) { return y(d.y); })
            .attr("opacity", 0.5)
            .style("fill", "#4292c6");

// x axis
        svg.append("g")
           .attr("class", "x axis")
           .attr('id', "axis--x")
           .attr("transform", "translate(0," + height + ")")
           .call(xAxis);

svg.append("text")
         .style("text-anchor", "end")
            .attr("x", width)
            .attr("y", height - 8)
         .text("X Label");

// y axis
        svg.append("g")
            .attr("class", "y axis")
            .attr('id', "axis--y")
            .call(yAxis);

svg.append("text")
            .attr("transform", "rotate(-90)")
            .attr("y", 6)
            .attr("dy", "1em")
            .style("text-anchor", "end")
            .text("Y Label");

scatter.append("g")
            .attr("class", "brush")
            .call(brush);

function brushended() {

function idled() {
            idleTimeout = null;
        }

function zoom() {

var t = scatter.transition().duration(750);
            svg.select("#axis--x").transition(t).call(xAxis);
            svg.select("#axis--y").transition(t).call(yAxis);
            scatter.selectAll("circle").transition(t)
            .attr("cx", function (d) { return x(d.x); })
            .attr("cy", function (d) { return y(d.y); });
        }

</script>
</body>

https://d3js.org/d3.v4.min.js