equivalent of JdiskReport on Ubuntu

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http://askubuntu.com – I have used JDiskReport published by JGoodies to analyse the file size distribution on Windows. I am wondering if there is anything that is an equivalent of JDiskReport for ubuntu. I ask this not for finding the file sizes on a particular system, I have used a shell script to find all the file sizes, but I would like to understand the file size distribution in a pictorial format. So that it is easy not only for me to understand but it is easy for me to explain this too. Due to my low reputation points I cannot post a picture, but I am looking for something like the figure 2 in this link (HowTos)