D3 Examples - Simple Circle Pack (d3 v4; CSV; 50 Lines)

Simple Circle Pack (d3 v4; CSV; 50 Lines)

This is the simplest circle pack diagram I could create. Let me know if you think I can make it tighter.

Build notes:

It pulls data from a csv file. It uses d3.stratify() to reform links into a hierarchy. (NOTE: I ran into a challenge with d.size when moving from json to csv. While size is a feature of my data, I had to now access it from d.data.size.)

To differentiate between local variables and framework objects, I prefix variables with lowercase 'v'.

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<!DOCTYPE html>
<meta charset="utf-8">
<head>
    <title>Simple Circle Pack (d3 v4; CSV; 50 Lines)</title>
    <script src="https://d3js.org/d3.v4.min.js"></script>
</head>
​
<style>
    circle {
        stroke: white;
        fill: #05668D;
        opacity: 0.3;
        stroke-width: 2px;
    }
</style>
<svg>
    <g></g>
</svg>
​
<script>
    var vWidth = 300;
    var vHeight = 200;
​
    // Prepare our physical space
    var g = d3.select('svg').attr('width', vWidth).attr('height', vHeight).select('g');
​
    // Get the data from our CSV file
    d3.csv('data.csv', function(error, vCsvData) {
        if (error) throw error;
​
        vData = d3.stratify()(vCsvData);
        drawViz(vData);
    });
​
    function drawViz(vData) {
        // Declare d3 layout
        var vLayout = d3.pack().size([vWidth, vHeight]);
​
        // Layout + Data
        var vRoot = d3.hierarchy(vData).sum(function (d) { return d.data.size; });
        var vNodes = vRoot.descendants();
        vLayout(vRoot);
        var vSlices = g.selectAll('circle').data(vNodes).enter().append('circle');
​
        // Draw on screen
        vSlices.attr('cx', function (d) { return d.x; })
            .attr('cy', function (d) { return d.y; })
            .attr('r', function (d) { return d.r; });
    }
</script>
​
    