r - Pie chart in ggplot2 with different sections apart -

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i trying make pie chart in ggplot2 figure below. each section of pie separated.

enter image description here

now want use ggplot2 make similar figure. 

a = c("cell","cell part","response stimulus") b = c('155','166','100') tmp = as.data.frame(cbind(a,b)) ggplot(tmp2, aes(x=a,y=b, fill=a)) + geom_bar(stat='identity') + scale_fill_brewer(palette='dark2') + coord_polar(start=0)

the figure got this: enter image description here

the radius of each section not equal. hope me find out how make radius equal.


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