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Rounded corner bar plot in R, we’ll show you how to use the ggchicklet package in the R programming language to make a ggplot2 bar chart with rounded bars.

The ggchicklet Package: An Overview

Bob Rudis’ ggchicklet package includes utilities for creating rounded rectangle segmented column charts (often known as “chicklets”).

Let’s dive into the topic.

Example 1: Barplot with Round Corners in R

We’ll teach you how to make rounded-corner barplots in R using the ggplot2 and ggchicklet package.

We must first create some data for this example.

df <- data.frame(value = 1:5,
                    group = LETTERS[1:5])
df
  value group
1     1     A
2     2     B
3     3     C
4     4     D
5     5     E

We constructed a data frame with a numeric and a character column by running the prior code.

The ggplot2 package must then be loaded.

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install.packages("ggplot2")                 
library("ggplot2")                               

We can now use the geom col method to create a conventional ggplot2 barplot, as illustrated below.

ggplot(data1, aes(group, value)) +      
geom_col()

 The barchart depicted in Figure 1 was constructed after executing the previous R programming code.

The corners of the bars are not yet rounded, as you can see.

We must also install and load the ggchicklet package in order to produce a bar graph with round corners.

install.packages("ggchicklet", repos = "https://cinc.rud.is")
library("ggchicklet")

We can now construct a barplot with round corners using the ggchicklet package’s geom chicklet function.

The radius argument in the geom chicklet function can be used to indicate how round the corners should be.

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ggplot(data1, aes(group, value)) + 
geom_chicklet(radius = grid::unit(3, "mm"))

As you can see, we’ve made another ggplot2 barplot, but this time we’ve rounded the edges of the bars.

Example 2: Stacked ggplot2 Barplot with Round Corners

When developing stacked barplots, we think rounded corners seem particularly petty.

To demonstrate this, we must first construct a new data set.

df2 <- data.frame(value = 1:16,
                   group = rep(LETTERS[1:4], each = 4),
                   sub = letters[1:4])
df2
   value group sub
1     1     A   a
2     2     A   b
3     3     A   c
4     4     A   d
5     5     B   a
6     6     B   b

The outcome of the previous code is shown above: A data frame with group and subgroup columns, as well as a values column.

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The geom chicklet function can then be used to create a stacked barplot of these data. Note that the fill parameter is also specified within the aesthetics of our plot.

ggplot(df2, aes(group, value, fill = sub)) +  
geom_chicklet(radius = grid::unit(3, "mm"))

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