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Line Chart Widget

Charts are a powerful way to visualize your data and discover insights. The Line Chart widget supports color customization, applying Formula, and changing the line shape (step or smooth), among other options.

Line chart examples

This widget also accepts features like metadata and groups, which can be set in your variable data.

On this page​

  1. 'Data Sources' Field
  2. Composing X-axis and Y-axis
  3. Filtering data

1. 'Data Sources' Field​

This field allows you to set the device and variable that will be used by the widget.

1.1 'Data Sources' for Normal Dashboards​

From the option Data Sources on the right menu, select one device from your list of devices and the variable that contains the data.

1.2 'Data Sources' for Blueprint Dashboards​

From the option Data Sources on the right menu, add the Blueprint device and input the name of the variable that contains the information. When using a Blueprint dashboard, the field Variable will list variables to be picked using the currently selected blueprint device.

2. Composing X-axis and Y-axis​

In the line chart widget, it is possible to customize how the data will be displayed in the horizontal and vertical axis.

2.1 X-axis​

By default, the X‑axis of the chart will be the time of the values, and you can customize the range of time. If you need to group your data through the X‑axis even if they don't have the same time, select a variable that contains the group; all data will then be grouped by groups.

Data is ordered by time ascending, but it is possible to change it to groups.

Image 5

It is also possible to define the X‑axis time range dynamically, using another variable data. The variable data should look like the following payload:

{
  "variable": "time_range",
  "value": "Any value",
  "metadata": {
    "start_date": "2021-06-17T00:00:00.000Z",
    "end_date": "2021-06-18T00:00:00.000Z"
  }
}

The start_date specifies the start of the range, and the end_date specifies the end of the range. In this case, the date and format should be in the ISO 8601 format.

2.2 Y-axis​

In the vertical axis, it is possible to customize the scaling behavior: apply metric prefixes and abbreviations, change the step value (represents the difference between each tick), and more. The Y‑axis will automatically find the best scale for your data; it is not necessary to customize it unless you want to do so.

3. Filtering data​

It is possible to pre‑set some date filters to be displayed, and these filters can be in minutes, hours, days, weeks, months, or custom by choosing a date in the calendar.

Image 7

4. Increasing performance​

For charts with a large number of data points, enable the Aggregate feature to improve widget performance and make the data easier to visualize. Learn more about the Aggregate feature.