Toan Hoang

Creating Radial Column Charts in Tableau

Toan Hoang

This is a quick tutorial on creating a Radial Column Chart in Tableau. I have seen so many interesting ways that this has been used, so I really hope you enjoy this quick and simple tutorial.

Note: This is an alternative type of data visualisation, and sometimes pushed for by clients. Please always look at best practices for data visualisations before deploying this into production.

Data

We will start by loading the Sample Superstore data into Tableau.

OrdersDownload

Note: If you have Tableau Desktop, you can use the Sample data source, but if you are using Tableau Public, download and load the following data source.

Once your data is loaded into Tableau, right-click on the data source and click on Edit Data Source… with the Data Source Editor open, paste the following: 

Position
1
2

Note: If you are using Tableau 2020.2 or great i.e. have access to new Relationship Model, you will need to double-click on the originally pasted data source to open up before pasting in the Path Data.

You should get an error as there is no joining column, however, click on Add new join clause, go to Create Join Calculation, type 1 and click OK. Do this for the right-hand side as well. Ensure that you have Inner join selected and you should see the following:

Note: we need additional records as we are going to be drawing lines and using densification to get more points on our canvas. For more information, check out our article on Data Densification.

Calculated Fields

With our data set loaded into Tableau, we are going to create the following Calculated Fields:

Index

INDEX()-1

TC_Position

WINDOW_MAX(MAX([Position]))

TC_Sales

WINDOW_SUM(SUM([Sales]))/2

TC_Total Sales

WINDOW_SUM(SUM([Sales]))/2

TC_Percentage of Total Sales

[TC_Sales]/[TC_Total Sales]

TC_Distance

[TC_Percentage of Total Sales]/WINDOW_MAX([TC_Percentage of Total Sales])

TC_Step Size

(360-(360/WINDOW_MAX([Index])))/WINDOW_MAX([Index])

This nifty calculation spaces our lines so that each line is evenly distributed around the circle. This takes into account the total number of Dimensions so is dynamic.

X

IF MAX([Position]) = 1 THEN
    SIN(RADIANS([Index]*[TC_Step Size]))
ELSE
    SIN(RADIANS([Index]*[TC_Step Size]))*(1+[TC_Distance])
END

Y

IF MAX([Position]) = 1 THEN
    COS(RADIANS([Index]*[TC_Step Size]))
ELSE
    COS(RADIANS([Index]*[TC_Step Size]))*(1+[TC_Distance])
END

With this done, let us start creating our data visualisation.

Worksheet

We will now build our first worksheet:

If all goes well, you should now see the following:

We will now adjust the Table Calculation to get what we are looking for:

You should now see the following, how simple was that?

Now we will adjust the Cosmetics:

You will want to end up with something like the following:

and boom, we are done! I hope you enjoyed this tutorial, and as always, you can find this data visualisation on Tableau Public at https://public.tableau.com/profile/toan.hoang#!/vizhome/RadialColumnChart/RadialColumnChart

Summary

I hope you all enjoyed this article as much as I enjoyed writing it and as always do share the love. Do let me know if you experienced any issues recreating this Visualisation, and as always, please leave a comment below or reach out to me on Twitter @Tableau_Magic. Do also remember to tag me in your work if you use this tutorial.

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