Toan Hoang

Creating Spiral Column Charts in Tableau

Toan Hoang

This is something that I have been wanting to create for a while, but alas, I put this on my backlog until I could figure it out. As such, I hope that you enjoy this tutorial on creating a Spiral Radial Column Chart in Tableau.

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 Desktop / Tableau Public.

Orders Data Source

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
0
0.01

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 Parameter and Calculated Fields:

Size Parameter

Spacing Parameter

Index

(INDEX()-1)*[Spacing]

TC_Sales

WINDOW_MAX(SUM([Sales]))/2

TC_Max Sales

WINDOW_MAX(SUM([Sales]))/2

TC_Percentage

[TC_Sales]/[TC_Max Sales]*[Size]

TC_Position

WINDOW_MAX(MAX([Position]))

TC_Starting Point

[TC_Position]+10+([Index]/100)

Note: I found that +10 worked well as a starting point. the ([Index]/100) creates a gradual increase in distance from the center

X

SIN(RADIANS([Index]))*(([TC_Position]*[TC_Percentage])+[TC_Starting Point])

Y

COS(RADIANS([Index]))*(([TC_Position]*[TC_Percentage])+[TC_Starting Point])

TC_Color

[TC_Percentage]/[Size]

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

Worksheet

We will now build our worksheet:

If all goes well, you should see the following:

We will now make some adjustments to the Table Calculations:

You should now see the following:

Now we will adjust the cosmetics:

You should now have the following:

Note: Try adjusting the Size and Spacing parameters, and also the TC_Starting Point calculated field

and boom, we are done! I hope you enjoyed creating this data visualization and learned some cool techniques as well. As always, you can find this data visualisation on Tableau Public at https://public.tableau.com/profile/toan.hoang#!/vizhome/SpiralRadialColumnCharts/SpiralRadialColumnChart

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 Visualization, 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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