Creating a dependency wheel chart with the Chart Config Editor

A dependency wheel chart is similar to a Sankey chart, but a dependency wheel displays flow between states around a circle rather than in a linear direction. In Looker, each dimension value is represented as a state, and the size of the flow is determined by a numeric measure value.

Using the Chart Config Editor, you can create dependency wheel charts by starting from a column chart in Looker.

Dependency wheel charts require at least two dimensions and exactly one measure.

For example, you can create a dependency wheel chart that shows the Order Item Count measure values over several Seasonal Collection dimension values, which flow into Category dimension values. Each dimension value is represented by a color-coded arc on the outside of the circle. The width of a line connecting two arcs corresponds to the values of the Order Item Count measure for that dimension pair. The higher the value, the wider the line.

Prerequisites

To access the Chart Config Editor, you must have the can_override_vis_config permission.

Writing the JSON snippet

To create a dependency wheel chart, start from the following JSON snippet:

{
  chart: {
    type: 'dependencywheel'
  }
}

Creating a dependency wheel chart

To create a dependency wheel chart, follow these steps:

1. View a column chart in an Explore, or edit a column chart in a Look or dashboard.

   Start from a column chart with at least two dimensions and exactly one measure. Your starting chart might look something like this example:

   

2. Open the Edit menu in the visualization.

3. In the Plot tab, click the Edit Chart Config button. Looker displays the Edit Chart Config dialog.

4. Select the Chart Config (Override) section, and enter the HighCharts JSON from the Writing the JSON snippet section of this page.

5. To let Looker properly format your JSON, click <> (Format code).

6. To test your changes, click Preview.

7. To apply your changes, click Apply. The visualization will be displayed using the custom JSON values.

Once you've customized your visualization, you can save it.

Limitations and requirements

When you're using dependency wheel charts, keep the following limitations and requirements in mind:

• Dependency wheel charts require at least two dimensions and exactly one measure.
• Dependency wheel charts can display a maximum of 50 rows of data.
• Dependency wheel charts don't support pivoted dimensions.