ggplot2 - R ggplot geom_tile without fill color -


i trying add geom_tile layer plot without filled color (just outline). there way transparent tile boundary visible?

thanks

i think after alpha parameter. minimal example:

  1. create plot dummy data set color (for "boundary") , no fill:

    p <- ggplot(pp(20)[sample(20*20, size=200), ], aes(x = x, y = y, color = z))

  2. add geom_tile() alpha set zero:

    p <- geom_tile(alpha=0)

  3. add theme_bw() transparent tiles lame dark gray background :)

    p + theme_bw()

enter image description here


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