# How to make a rounded corner bar plot in R?

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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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