Toan Hoang

Creating Half Circle Gauge Charts in Tableau

Toan Hoang

Requested from a friend, here is a nice and simple tutorial on creating Half Circle Gauge Charts in Tableau. In this tutorial, we are going to show the colour-coded percentage out of 100.

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

Load the following data into Tableau Desktop / Tableau Public.

Country,Value
United Kingdom,90
United States,70
Australia,50
France,30

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

Type,Path
Foreground,1
Foreground,182
Background,1
Background,182

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 two records for each Country 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 and Bins:

Create Path (bin)

Index

(INDEX()-1)*2

TC_Type

WINDOW_MAX(MAX([Type]))

TC_Value

WINDOW_MAX(MAX([Value]))/100

X

IF [TC_Type] = "Foreground" THEN
    IF [Index] <= 180 THEN
        COS(RADIANS([Index]*[TC_Value]))
    ELSE
        COS(RADIANS((362-[Index])*[TC_Value]))*2
    END
ELSE
    IF [Index] <= 180 THEN
        COS(RADIANS([Index]))
    ELSE
        COS(RADIANS(362-[Index]))*2
    END
END

Y

IF [TC_Type] = "Foreground" THEN
    IF [Index] <= 180 THEN
        SIN(RADIANS([Index]*[TC_Value]))
    ELSE
        SIN(RADIANS((362-[Index])*[TC_Value]))*2
    END
ELSE
    IF [Index] <= 180 THEN
        SIN(RADIANS([Index]))
    ELSE
        SIN(RADIANS(362-[Index]))*2
    END
END

Color

IF [TC_Type] = "Foreground" THEN
    IF [TC_Value] > 0.8 THEN
        "Green"
    ELSEIF [TC_Value] < 0.5 THEN
        "Red"
    ELSE
        "Orange"
    END
ELSE
    "Grey"
END

Zero

0

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 our data visualisation.

You should have the following:

We will now adjust the cosmetics.

Edit the filters and you should now hopefully have the following:

and boom, we are done, you can find my data visualisation on Tableau Public at https://public.tableau.com/profile/toan.hoang#!/vizhome/HalfCircleGaugeCharts/HalfCircleGaugeCharts

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.

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