EON Charts

Realtime animated graphs with PubNub and C3.

Examples

Quickstart

<script type="text/javascript" src="//pubnub.github.io/eon/v/eon/0.0.10/eon.js"></script>
<link type="text/css" rel="stylesheet" href="//pubnub.github.io/eon/v/eon/0.0.10/eon.css"/>
<div id="chart"></div>
<script>
  var pubnub = PUBNUB.init({
    publish_key:   'demo', // replace with your own pub-key
    subscribe_key: 'demo' // replace with your own sub-key
  });

  eon.chart({
    pubnub: pubnub,
    channel: "c3-spline", // the pubnub channel for real time data
    generate: {           // c3 chart object
      bindto: '#chart'
    }
  });
</script>

Parameter	Value	Default
channel	Your PubNub channel name.	`false`
generate	Your C3 chart generation config.	`undefined`
flow	Used to update spline charts over time series.	`false`
limit	The size of your buffer. How many values to display on the chart before shifting the first value off and appending a new value. This is not native to C3.	`10`
history	Fill the buffer by using PubNub history call to retrieve last `limit` messages. Requires PubNub storage to be enabled.	`false`
x_type	Your x axis configuration. Can be `"auto"`, `"custom"`, or `false`. Read more about `x_type` below.	`"auto"`
x_id	Your x axis source if `x_type == "custom"`	`"x"`
message	A function to call everytime a PubNub message is recieved. See PubNub subscribe	function(message, env, channel){}
transform	Method for changing the payload format of your stream. See example	`function(m){return m}`
connect	A function to call when PubNub makes a connection. See PubNub subscribe	`function(){}`
pubnub	An instance of the PUBNUB javascript global. This is required when using your own keys. See the `subscribe_key` example.	`false`
debug	Log EON events to console as they happen	`false`

Simple Example

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>
  var pubnub = PUBNUB.init({
    publish_key:   'demo', // replace with your own pub-key
    subscribe_key: 'demo' // replace with your own sub-key
  });

  eon.chart({
    pubnub: pubnub,
    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', // replace with your own pub-key
  subscribe_key: 'demo' // replace with your own sub-key
});

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.

More on Publishing Messages

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/

Customize Your Graph

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.

X Axis Configuration

Automatic

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".

Custom

If you'd like to supply your own Javascript timestamp, set x_type to custom. Then, set x_id to the x value that appears within your published messages. Any custom x must be a microtime date like 1465417017340.

var pubnub = PUBNUB.init({
  publish_key:   'demo', // replace with your own pub-key
  subscribe_key: 'demo' // replace with your own sub-key
});

eon.chart({
  pubnub: pubnub,
  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)
    }
  }
});

Multiple Points Per Payload

It is possible to publish multiple plot points per payload. Rather than using the object name eon use the name eons and supply an Array. Because you use the eons property name, the library will know to loop through the array and plot each point.

Note that if publishing multiple points per payload, you must use x_type: "custom" and supply an x_id.

eons: [
  {
    x: new Date().getTime(),
    value: 1
  },
  {
    x: new Date().getTime(),
    value: 2
  }
]

Here's an example of data collected at 100ms increments, but only publishes every 1,000ms. Every payload includes 10 points with 100ms resolution. See a full example here.

setInterval(function(){
  var data = [];
  var date = new Date().getTime();

  for(var i = 0; i < 10; i++) {
      data.push({
          'pub_time': date + (100 * i),
          'Austin': Math.floor(Math.random() * 99)
      });
  }

  pubnub.publish({
    channel: channel,
    message: {
      eons: data
    }
  });

}, 1000);

Disable

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...).

Distributed Systems

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.

Asepdadan/eon-chart