How to draw venn pie-agram (multi-layer pie chart) in R?

September 25, 2014
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I was wondering how to draw a venn diagram like pie chart in R, to show the distribution of my RNA-seq reads mapped onto different annotation regions (e.g. intergenic, intron, exons etc.). A google search returns several options, including the nice one from Xiaopeng’s bam2x (see below). However, he told me it’s not released yet. And it’s javascript based.

Why not I just make one in R? 
Here is the design scratch:
And here is example code:

Here is output:

You can also use par(mfrow=c(n,m)) to put multiple venn pieagram in one figure. 

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