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Ternary Plots in JavaScript

How to create D3.js-based ternary plots. Examples of Ternary Plots with plotly.


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Plotly is a free and open-source graphing library for JavaScript. We recommend you read our Getting Started guide for the latest installation or upgrade instructions, then move on to our Plotly Fundamentals tutorials or dive straight in to some Basic Charts tutorials.

var rawData = [
    {journalist:75,developer:25,designer:0,label:'point 1'},
    {journalist:70,developer:10,designer:20,label:'point 2'},
    {journalist:75,developer:20,designer:5,label:'point 3'},
    {journalist:5,developer:60,designer:35,label:'point 4'},
    {journalist:10,developer:80,designer:10,label:'point 5'},
    {journalist:10,developer:90,designer:0,label:'point 6'},
    {journalist:20,developer:70,designer:10,label:'point 7'},
    {journalist:10,developer:20,designer:70,label:'point 8'},
    {journalist:15,developer:5,designer:80,label:'point 9'},
    {journalist:10,developer:10,designer:80,label:'point 10'},
    {journalist:20,developer:10,designer:70,label:'point 11'},
];

Plotly.newPlot('myDiv', [{
    type: 'scatterternary',
    mode: 'markers',
    a: rawData.map(function(d) { return d.journalist; }),
    b: rawData.map(function(d) { return d.developer; }),
    c: rawData.map(function(d) { return d.designer; }),
    text: rawData.map(function(d) { return d.label; }),
    marker: {
        symbol: 100,
        color: '#DB7365',
        size: 14,
        line: { width: 2 }
    },
}], {
    ternary: {
        sum: 100,
        aaxis: makeAxis('Journalist', 0),
        baxis: makeAxis('<br>Developer', 45),
        caxis: makeAxis('<br>Designer', -45),
        bgcolor: '#fff1e0'
    },
    annotations: [{
      showarrow: false,
      text: 'Replica of Tom Pearson\'s <a href="http://bl.ocks.org/tomgp/7674234">block</a>',
        x: 1.0,
        y: 1.3,
        font: { size: 15 }
    }],
    paper_bgcolor: '#fff1e0',
});

function makeAxis(title, tickangle) {
    return {
      title: title,
      titlefont: { size: 20 },
      tickangle: tickangle,
      tickfont: { size: 15 },
      tickcolor: 'rgba(0,0,0,0)',
      ticklen: 5,
      showline: true,
      showgrid: true
    };
}
Inspired from Tom Pearson's block
var url = 'https://gist.githubusercontent.com/davenquinn/988167471993bc2ece29/raw/f38d9cb3dd86e315e237fde5d65e185c39c931c2/data.json';

Plotly.d3.json(url, function(err, rawData) {
    if(err) throw err;

    plot(rawData);
});

function plot(rawData) {
    var data = Object.keys(rawData).map(function(k) {
        var pts = rawData[k];

        return {
            type: 'scatterternary',
            mode: 'lines',
            name: k,
            a: pts.map(function(d) { return d.clay }),
            b: pts.map(function(d) { return d.sand }),
            c: pts.map(function(d) { return d.silt }),
            line: { color: '#c00' }
        };
    });

    var layout = {
        ternary: {
            sum: 100,
            aaxis: makeAxis('Clay'),
            baxis: makeAxis('Sand'),
            caxis: makeAxis('Silt')
        },
        showlegend: false,
        width: 700,
        annotations: [{
            showarrow: false,
            text: 'Replica of Daven Quinn\'s <a href="http://bl.ocks.org/davenquinn/988167471993bc2ece29">block</a>',
            x: 0.15,
            y: 1.1
        }]
    };

    Plotly.newPlot('myDiv', data, layout);
}

function makeAxis(title) {
  return {
      title: title,
      ticksuffix: '%',
      min: 0.01,
      linewidth: 2,
      ticks: 'outside',
      ticklen: 8,
      showgrid: true,
  };
}
Inspired from Daven Quinn's block