Change Color of Bars in Barchart using ggplot2 in R

Showing data values on stacked bar chart in ggplot2 in R

Last Updated : 29 Jun, 2021

In this article, you'll learn how to show data values on a stacked bar chart in ggplot2 in R Programming Language.

To show the data into the Stacked bar chart you have to use another parameter called geom_text().

Syntax:

geom_text(size, position = position_stack(vjust = value), colour)

Here the size represents the size of the font that will appear on the plot and position_stack() will automatically add values to the plot at their respective positions.

Example 1:

R

# Creating the Data
Subject = c(rep(c("Hindi", "English", "Math", "Science",
                  "Computer Science"), times = 4))

Year = c(rep(c("2017-18", "2018-19", "2019-20",
               "2020-21"), each = 5))

Students_Passed = c(67,34,23,66,76,66,90,43,45,78,54,73,
                    45,76,88,99,77,86,56,77)

# Passing the Data to DataFrame
Students_Data = data.frame(Subject,Year,Students_Passed)

# loading the Library
library(ggplot2)

# Plotting the Data in ggplot2
ggplot(Students_Data, aes(x = Year, y = Students_Passed, 
                          fill = Subject, label = Students_Passed)) +
geom_bar(stat = "identity") + geom_text(
  size = 3, position = position_stack(vjust = 0.5))

Output:

It is also possible to change the color of data values using geom_text() itself. For this just pass the font color to the color attribute.

Example 2:

R

# Creating the Data
Subject = c(rep(c("Hindi", "English", "Math", "Science",
                  "Computer Science"), times = 4))
Year = c(rep(c("2017-18", "2018-19", "2019-20",
               "2020-21"), each = 5))
Students_Passed = c(67,34,23,66,76,66,90,43,45,78,54,
                    73,45,76,88,99,77,86,56,77)

# Passing the Data to DataFrame
Students_Data = data.frame(Subject,Year,Students_Passed)

# loading the Library
library(ggplot2)

# Plotting the Data in ggplot2
ggplot(Students_Data, aes(x = Year, y = Students_Passed, 
                          fill = Subject, label = Students_Passed)) +
geom_bar(stat = "identity") + geom_text(
  size = 5, position = position_stack(vjust = 0.5),colour = "white")

Output

Change Color of Bars in Barchart using ggplot2 in R

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