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How to create a transparent polygon using ggplot2 in R?
A transparent polygon just represents the border lines and a hollow area; thus, we can only understand the area covered but it becomes a little difficult to understand the scales. Hence, this visualisation technique is not as useful as others that fills the area with a different color. But it could be used if the range of the data is not large.
Consider the below data frame −
Example
set.seed(123) x<-sample(1:5,10,replace=TRUE) y<-sample(3:8,10,replace=TRUE) df<-data.frame(x,y) df
Output
x y 1 2 8 2 4 5 3 3 7 4 5 6 5 5 3 6 1 8 7 3 4 8 5 3 9 3 4 10 3 8
Loading ggplot2 package and creating a polygon using x and y −
Example
library(ggplot2) ggplot(df,aes(x,y))+geom_polygon()
Output
Creating a polygon using x and y with transparency −
Example
ggplot(df,aes(x,y))+geom_polygon(fill=NA,color="red")
Output
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