r - ggplot alter map fill opacity by second variable -


i'm creating cloropleth map of u.s each county colored proportion of 2012 votes obama. i'd vary opacity of county overlays population (similar done here). i've tried adding alpha = populationvariable geom_map aes, without luck.

here current code. can point me in right direction?

gg <- ggplot() gg <- gg + geom_map(data=mapc, map=mapc, aes(x=long, y=lat, map_id=id, group=group, fill=mapc$proportionobama)) gg = gg+ scale_fill_gradient2(limits= c(0,100), name="proportion of votes obama", low="#e5000a", high="#0012bf",mid="#720964", midpoint=50) gg = gg + theme_map() +coord_equal() gg <- gg + geom_path(data = maps,  aes(long,lat, group=group), colour="gray50", size=.25) gg = gg + theme(legend.position="right") gg

i think alpha needs variable that's mapped between 0 , 1. ggplot documentation shows fractional value.

you don't have reproducible code, here quick test seemed work.

library(data.table) library(ggplot2)   tmp = data.table(   'x'=c(1,2,3),   'y'=c(1,2,3),   'z'=c(.1,.5,.8) )  p = ggplot() p = p + geom_point( data=tmp , aes(x=x,y=y,alpha=z)) print(p)

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