How to make a rounded corner bar plot ?

General
2

You can't easily do this in ggplot, because rounded lines extend beyond the normal "limits" of the line:

ggplot(mtcars, aes(x = factor(cyl), xend = factor(cyl), yend = stat(count) - stat(count))) + 
    stat_count(geom = 'segment', size = 50)

Rplot

ggplot(mtcars, aes(x = factor(cyl), xend = factor(cyl), yend = stat(count) - stat(count))) + 
    stat_count(geom = 'segment', size = 50, lineend = 'round')

Rplot01

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