Realtime animated graphs with PubNub and C3.

• Spline Chart
• Bar Chart
• Donut Chart
• Gauge Chart

<script type="text/javascript" src="//pubnub.github.io/eon/v/eon/0.0.9/eon.js"></script>
<link type="text/css" rel="stylesheet" href="//pubnub.github.io/eon/v/eon/0.0.9/eon.css"/>
<div id="chart"></div>
<script>
  eon.chart({
    channel: "c3-spline", // the pubnub channel for real time data
    generate: {           // c3 chart object
      bindto: '#chart'
    }
  });
</script>

Plug your normal C3 config into the generate param. Supply a PubNub channel in channel param. eon.chart returns the normal c3 chart object.

<div id="chart"></div>
<script>
  eon.chart({
    channel: "c3-spline",
    generate: {
      bindto: '#chart',
      data: {
        labels: true
      }
    }
  });
</script>

That's it! Now you can publish messages to the same channel and they'll render in the graph.

var pubnub = PUBNUB.init({
  publish_key: 'demo',
  subscribe_key: 'demo'
});
setInterval(function(){
  
  pubnub.publish({
    channel: 'c3-spline',
    message: {
      eon: {
        'Austin': Math.floor(Math.random() * 99),
        'New York': Math.floor(Math.random() * 99),
        'San Francisco': Math.floor(Math.random() * 99),
        'Portland': Math.floor(Math.random() * 99)
      }
    }
  });

}, 1000);

All chart data must exist within an object called eon. Also notice how the channel matches in both examples.

This uses the included PubNub library to pubnub.publish() packets to the pubnub.subscribe() call waiting inside the C3 framework.

You probably want to publish data from the back-end instead. Check out our docs for more info:

http://www.pubnub.com/documentation/

eon-chart works will all supported graph types in C3. Just check out the examples above.

You can learn more about customizing your graph from the official C3 docs.

eon-chart will automatically use the PubNub message timestamp for chart x values. This timestamp is recorded when a message is published to the PubNub data stream network. This is the case when x_type is set to "auto".

If you'd like to supply your own timestamp (or other x value), set x_type to custom. Then, set x_id to the x value that appears within your published messages.

eon.chart({
  channel: "c3-spline", // the pubnub channel for real time data
  generate: {           // c3 chart object
    bindto: '#chart',
    x_type: 'custom',
    x_id: 'x'
  }
});

Notice how the code below publishes a key value pair called x with every message.

pubnub.publish({
  channel: 'c3-spline',
  message: {
    eon: {
      'x': new Date().getTime(),
      'Austin': Math.floor(Math.random() * 99)
    }
  }
});

You can disable eon-chart modifications by setting x_type to false. By default C3 will use an incremental x axis (1,2,3,4...).

You can publish from multiple sources into one chart. For example, you can graph the individual memory usage from 3 servers by supplying the same channel to your PubNub publish requests.

Check out our distributed chart example.