element_blank doesn't seem to make panel.background blank when using gridExtra

[Scott Chamberlain]

Shouldn't panel.background = element_blank make a blank panel background?  It doesn't seem to work for me when trying to layer multiple plots using gridExtra. See example below. 

require(ggplot2); require(gridExtra)

a <- ggplot(mtcars, aes(mpg, cyl)) + 

geom_point() +

theme(panel.background = element_blank())

b <- ggplot(mtcars, aes(disp)) + 

geom_histogram() +

theme(panel.background = element_blank())

grid.newpage()

pushViewport(viewport(layout = grid.layout(2,1)))

vpa_ <- viewport(width = 0.9, height = 0.38, x = 0.5, y = 0.49)

vpb_ <- viewport(width = 0.9, height = 0.38, x = 0.5, y = 0.49)

print(a, vp = vpa_)

print(b, vp = vpb_)

## The attached figure shows the output where the second figure (b) just overlays a, whereas if there was not background wouldn't you be able to see the bottom figure through the top one?

> sessionInfo()

R version 2.15.1 (2012-06-22)

Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:

[1] C/en_US.UTF-8/C/C/C/C

attached base packages:

[1] grid      stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:

[1] gridExtra_0.9.1 ggplot2_0.9.2   sacbox_0.0.0    plyr_1.7.1      stringr_0.6.1   knitr_0.7      

[7] devtools_0.7.1 

loaded via a namespace (and not attached):

 [1] MASS_7.3-19        RColorBrewer_1.0-5 RCurl_1.91-1       SparseM_0.96       apTreeshape_1.4-4 

 [6] ape_3.0-5          bipartite_1.17     calibrate_1.7.1    colorspace_1.1-1   dichromat_1.2-4   

[11] digest_0.5.2       evaluate_0.4.2     formatR_0.6        gee_4.13-18        gtable_0.1.1      

[16] httr_0.1.1         igraph_0.6-2       labeling_0.1       lattice_0.20-6     memoise_0.1       

[21] msm_1.1.1          munsell_0.3        mvtnorm_0.9-9992   nlme_3.1-104       numDeriv_2012.3-1 

[26] phytools_0.1-9     proto_0.3-9.2      quantreg_4.81      reshape2_1.2.1     scales_0.2.2      

[31] splines_2.15.1     survival_2.36-14   tnet_3.0.7         tools_2.15.1       vegan_2.0-4  

[Brandon Hurr]

Even setting everything to NA doesn't work...

a <- ggplot(mtcars, aes(mpg, cyl)) +
geom_point() +

theme(panel.background = element_rect(fill = NA), panel.border= element_rect(fill=NA))

b <- ggplot(mtcars, aes(disp)) +
geom_histogram() +

theme(panel.background = element_rect(fill = NA), panel.border= element_rect(fill=NA))

It's the plot.background that is actually causing the issue though. 

theme(panel.background = element_blank(),  panel.border= element_blank(), and plot.background = element_blank())

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[Scott Chamberlain]

Ahhh, I see now. In the previous ggplot2 version I only needed panel.background = theme_blank(). 

Thanks, S