openmon.org | R - Making a simple treemap

R - Making a simple treemap

Hi !

I think you have understood that I find a representation of data in the form of a treemap very good.

But how to do it in a simple way with the R language? When I say simple, this is because I use the features in a basic way.

Here is the entire code:

#!/usr/local/bin/Rscript

library(treemap)

group <- c("Attacks on SSH","Attacks on Web","Attacks on Mail")
subgroup <- c("20","4","10")
value <- c(20,4,10)

ttitle=paste("demo_treemaps_some_attacks") 
OutputFilename <- sprintf("./demo_some-attacks_using_treemaps.png")
png(width=800,height=600,file=OutputFilename)

data <- data.frame(group,subgroup,value)

treemap(data,
    index=c("group","subgroup"), 
    vSize="value", 
    type="index",
     fontsize.labels=c(15,12),              
     fontcolor.labels=c("white","blue"),   
     fontface.labels=c(2,1),              
     overlap.labels=0.5,               
     inflate.labels=F,                 
     align.labels=list(
        c("center", "center"), 
        c("right", "bottom")
     ),                                 
     title=ttitle
)
dev.off()

Let’s try to break down the process I use.

First, here is the standard way to launch a script under Unix (here the R interpreter instead of any shell).

#!/usr/local/bin/Rscript

We declare the use of the treemap library (I pass on the installation of this one).

library(treemap)

The definition of the image:

The image title ;
The name of the generated file ;
The definition of the file (in the sense of image format/size).

ttitle=paste("demo_treemap_some_attacks") 
OutputFilename <- sprintf("./demo_treemap_some_attacks.png")
png(width=800,height=600,file=OutputFilename)

We are now getting down to business, the definition of treemap data. Simply three vectors made up of:

The group indicates the title of each of the blocks ;
The subgroup represents what the group is ;
The values of each group (which will influence the size of the groups).

group <- c("Attacks on SSH","Attacks on Web","Attacks on Mail")
subgroup <- c("20","4","10")
value <- c(20,4,10)

We define a dataframe with the content of the values of the three vectors previously defined.

data <- data.frame(group,subgroup,value)

We call the treemap() function with different parameters. I’m not going to go into detail about everything that’s available.

"help(treemap)" is your friend within the R interpreter.

treemap package:treemap R Documentation

Create a treemap

Description:

      A treemap is a space-filling visualization of hierarchical
      structures. This function offers great flexibility to draw
      treemaps. Required is a data.frame ('dtf') that contains one or
      more hierarchical index columns given by ‘index’, a column that
      determines the rectangle area sizes (‘vSize’), and optionally a
      column that determines the rectangle colors (‘vColor’). The way
      how rectangles are colored is determined by the argument ‘type’.

Use:

      treemap(
        dtf,
        index,
        .
        .
        .
      )

Here is the detail about the call to the function.

treemap(data,
    index=c("group","subgroup"), 
    vSize="value", 
    type="index",
     fontsize.labels=c(15,12),              
     fontcolor.labels=c("white","blue"),   
     fontface.labels=c(2,1),              
     overlap.labels=0.5,               
     inflate.labels=F,                 
     align.labels=list(
        c("center", "center"), 
        c("right", "bottom")
     ),                                 
     title=ttitle
)

We close the image.

dev.off()

Here is the result:

Example image

In a future post, we will move on to making a slightly more complex treemap.

Regards

Tree Of Things

R - Making a simple treemap