When it comes to shapes , there are studies that suggest humans are more inclined to slight curves. It comes as no surprise with the popularity of  visualization that has curves or arcs in it. It gives a WOW factor. The usability  of such charts may be questionable, but I bet you will like a curved bump chart more than an ordinary bump chart.

Curved lines are not available in tableau and creating them requires some effort. So lets start simple. Draw a circle ? . Learn the basics and go on to create some stunning custom charts!!!!!!!!

This blog will give a basic understanding of creating custom charts using the X and Y Coordinates. Most of the custom charts like Radial bar chart, Polar chart, curved Bump chart  etc. use the  X and Y coordinates to plot arcs or curves or circle in tableau.

We are just using a dummy dataset for this.


For this we will use  1 dummy  record

Name Value
Circle 1

Import the data into tableau. Union the data with itself. This is known as data densification. With just 2 rows we get enough points to plot a circle !!!!

Create calculated field


if [Table Name]=’Sheet1′

then 1

ELSE 360


–This field is for creating 360 points. We will be creating (X,Y) values for 360 points and plot the circle.

The (X,Y) coordinates of a circle with radius R is

   X= R COS θ  ,Y= R SIN θ

Lets create the required fields in tableau now. From Path, Create Path Bin with size of bin as 1.


Create calculated field


INDEX()-1               — set compute using to Path(bin). This will give value from 0-259 for Index.  For each of the Index points , we will create Radian(or angle), X and Y value


[index]*PI()/180    — angle in radians at which each point is plotted.


2*cos([Radians])    — 2 is the radius of the circle.



Its time to create the circle. Drag and drop Path Bin to Rows . Right click and ‘Show Missing Values’.

Drag path(bin) to details. Drag X to rows and Y to Columns. Set compute using to Path(bin). Change the mark type to circle. And we have the circle 🙂

Watch this space for more custom charts!!!!!!!!!!!!

Asha Surabhi
Author: Asha Surabhi

Asha is a Computer Science graduate with 8+ years of experience as a BI Developer. She worked on different reporting tools, databases and have good understanding of data warehouse concepts. Her previous experiences were in Healthcare and Banking domain. She started learning Tableau after a long career break and instantly got hooked to the creative visualisations in the Tableau community. She loves to create custom charts and loves the flexibility of Tableau to create stunning visualisations. She also dived into data analytics and found bringing meaning to raw data and finding new insight interesting. She came to know about Data School while doing Makeover Monday projects and found it the perfect opportunity to work on real life situations. In her free time, she loves reading and painting.