[R] ggplot2 fill problem in colour shading

[David Winsemius]

> On Aug 11, 2019, at 9:13 AM, Troels Ring <tring using gvdnet.dk> wrote:
> 
> Dear friends - I have 2  problems with ggplot2
> 
> Here is the code for illustration
> 
> 
> 
> x <- seq(1,10,length=10000)
> 
> y <- x^2
> 
> fill <- rep(0,length(x))
> 
> fill[(5<x)&(x<7.5)] <- "red"
> 
> ddf <- data.frame(x,y,fill)
> 
> ggplot(data=ddf,aes(x=x,y=y)) + geom_area(aes(fill=fill)) + geom_line()
> 
> 
> 
> First the embarrassing one: I would really like no fill except from x from 5
> to 7.5 or transparency so the background is still visible. Have tried NULL
> and NA with no effect.
> 
> The other thing is that it appears that above the blue area some of the
> other color spills true - reddish on my system.
> 

I'm not exactly clear on the request, but perhaps this will help clarify. Need to extract the desired portion of the ddf object to give to the geom_area function:

ggplot(data=ddf,aes(x=x,y=y)) + geom_line(color="blue") + geom_area(data=ddf[(5<ddf$x)&(ddf$x<7.5),], inherit.aes=FALSE, aes(x=x,y=y,fill=fill) )

-- 
David.
> 
> 
> Windows 10 
> 
> R version 3.6.1 
> 
> 
> 
> All best wishes
> 
> Troels Ring
> 
> Aalborg, Denmark
> 
> 
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> 
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David Winsemius
Alameda, CA, USA

'Any technology distinguishable from magic is insufficiently advanced.'   -Gehm's Corollary to Clarke's Third Law