TiTv Stacked Bar Plot Fails Unless Cairo is Bitmap Type

[DarioS]

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I take the example code from the documentation of titv. If I don't change any setting, it fails with

## Warning in xypolygon(xx, yy, lty = "blank", col = boxfill[i]): semi-
## transparency is not supported on this device: reported only once per page

and the plot is incomplete and also missing colours.

It's because

> getOption("bitmapType")
[1] "Xlib"

If I add options(bitmapType = "cairo") to the top of the R Markdown document and knit it again, I see the complete and correct plot. Perhaps this required setting should be documented. Or, this warning could be caught and solid colours automatically used instead of transparency.

> sessionInfo()
R version 3.5.2 (2018-12-20)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.1 LTS

Matrix products: default
BLAS: /usr/local/lib/R/lib/libRblas.so
LAPACK: /usr/local/lib/R/lib/libRlapack.so

[PoisonAlien]

Oh I see! Never encountered this till now. Thanks you for pointing, I will fix it.

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