r - Colour just the top border of geom_bar -

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a chart lot of bars looks squished, instance - 

ggplot(data.frame(x = 1:1000, y = (rnorm(1000)), fill = sample(c('a','b','c'), 1000, replace = t)), aes(x, y, fill = fill)) +  geom_bar(stat = 'identity')

i have chart similar dataset feel able make more sense out of colouring top border of bar. i'm unable achieve this. closest can incorporate geom_step adds vertical lines y value changes , crowds chart more. geom_point sizes aren't synced separation on x axis spill on side small x values. sure shot solution i'm able think of manipulate data such i'm able draw geom_segments work me. there other way

ps: need stick format reasons.

you use geom_errorbar() , set ymin= , ymax= y values. can play width= , size= need.

ggplot(data.frame(x = 1:1000, y = (rnorm(1000)), fill = sample(c('a','b','c'), 1000, replace = t))) +         geom_errorbar(aes(x=x,ymin=y,ymax=y,color=fill),size=0.5,width=3)

enter image description here


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