r - ggplot2: geom_bar stacked barplot, specify bar outline color -

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I am trying to figure out how to specify the outline color on a stacked barplot in ggplot2. In the code below I specify color = "green" which gives a green outline for each time, I would like to specify a different outline color for each bar (like cut = fair will be filled with yellow and outlined with orange, cut = good will be light green and underlined with dark green, etc.). 

  ggplot (diamond) + geom_bar (AES (clarity, fill = cut)) + scale_fill_manual (values ​​= c ("fair" = "yellow", "good" = "light green I have tried  scale_color_manual ("very good" = "light blue", "premium" = "pink", "ideal" = "purple"))  )  and  geom_bar ()  specify a vector of colors in aesthetics, neither has worked.   
 
 
 You have to map both the sensations in the  cut  variable, and then you You can use  scale_colour_manual . This is an (ugly) example:  
  ggplot (diamond) + geom_bar (AES (clarity, fill = cut, color = cut)) + scale_colour_manual (values ​​= c ("fair" = "Brown", "good" = "blue", "very good" = "green", "premium" = "red", "ideal" = "yellow")) + scale_fil_manual (values ​​= c ("fair "=" Yellow "," good "=" light green "," very good "=" light blue "," premium "=" pink "," ideal "=" purple "))   
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