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October 13, 2015 11:55
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How to use the 'stroke' option of geom_point in ggplot2 R package
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| # For the moment, ggplot2 stable version cannot support the option 'geom_point(stroke = 2)' to change border size of points | |
| # To use it we need to install ggplot2 development version | |
| # To do that we first want to install 'devtools' package which makes packages installation from GitHub easier | |
| install.packages("devtools") | |
| # 'ggplot2' last version is at 'http://github.com/hadley/ggplot2/' | |
| # thus using devtools' function 'install_github()' (install from GitHub) the syntax is simple: | |
| devtools::install_github("hadley/ggplot2") # Note the use of '::' not to load the entire package | |
| # Plots | |
| ggplot(mtcars, aes(x = mpg, y = disp, colour = as.factor(vs), fill = as.factor(cyl)) + | |
| geom_point(size = 4, stroke = 5) | |
| # Does not work, why? Because the default circle shape for points does not have both 'fill' and 'colour' attributes | |
| # Only shapes with 'pch' between 21 and 25 do | |
| # Working plot | |
| ggplot(mtcars, aes(x = mpg, y = disp, colour = as.factor(vs), fill = as.factor(cyl)) + | |
| geom_point(size = 4, stroke = 5, pch = 21) |
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See I don't understand this