Gviz change color of groups
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@franceschinigianmarco-16472
Last seen 14 months ago

I am trying to plot two groups within a single track using Gviz.


sample_tissue = DataTrack(data = all_beta, start = sg_tissue$start,
                            end = sg_tissue$end, chromosome = chr, 
genome = gen, name = "Tissue Beta",
                            groups = tissue_all_class, degree = .8, family = c("symmetric", "gaussian"), evaluation = 100,
                            background.title = "brown", type = c("smooth", "p"), cex.legend = 0.7,     
                            cex.title = .6, cex.axis = .6, ylim = c(0,100))

I would like to change default colours (magenta and cyan), is it possible?

I've read the manual and it describes a step involving the use of feature, and the possibility of overwriting the default fill color, but I can't sort it out.

Moreover, I would like to know if it is possible to set different alphas for different elements in the track. In this case, I would like to have alpha = 1 for the "smooth" and alpha=0.5 for the "p", for example.

Thank you for your help,

gviz-package gviz • 1.7k views
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@florianhahnenovartiscom-3784
Last seen 3.1 years ago
Switzerland

Have you tried the obvious?

dat <- matrix(runif(400), nrow=4)
dtTrack <- DataTrack(start=seq(1,1000, len=100), width=10, data=dat, chromosome=1, genome="mm9", name="random data")    
library(GenomicRanges)
gr <- GRanges(seqnames="chr1", ranges=IRanges(seq(1,1000, len=100), width=10))
values(gr) <- t(dat)
dtTrack <- DataTrack(range=gr, genome="mm9", name="random data", groups=c(1,1,2,2), col=c("red", "orange"), degree = .8, family = c("symmetric", "gaussian"))
plotTracks(dtTrack, type=c("smooth", "p"))​

For different alpha settings you will indeed need to use the more flexible OverlayTrack functionality.

 

 

 

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Thank you for your answer, I don't know how I managed to miss this very basic attempt

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What if there were two DataTracks with data containing the same groups but appearing in a different order (because it is different data) and I want to have the groups to be the same colours? Is there a way to force colours to specific groups?

Using the above example I guess it would be equivalent to:

`dtTrack1 <- DataTrack(range=gr, genome="mm9", name="random data", groups=c(1,1,2,2), col=c("red", "orange"), degree = .8, family = c("symmetric", "gaussian"))

dtTrack2 <- DataTrack(range=gr, genome="mm9", name="random data", groups=c(2,1,1,2), col=c("red", "orange"), degree = .8, family = c("symmetric", "gaussian"))

plotTracks(dtTrack1, dtTrack2, type=c("smooth", "p"))`

And yes - I know that 'col=c("orange", "red")' would solve it with this example but I have many more groups, so this is not what I am after.

Thank you.

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Hi Kristian,

You can achieve it with defining group as a factor.

Best Robert

library(Gviz)

set.seed(123)
gr <- GRanges("chr1", IRanges(sort(sample(999, 100)), width=1))
mcols(gr) <- matrix(runif(400), ncol=4)

dtTrack1 <- DataTrack(range=gr, genome="mm9", name="random data", groups=factor(c(1,1,2,2), levels=c(1,2)), col=c("red", "orange"), degree = .8, family = c("symmetric", "gaussian"))

dtTrack2 <- DataTrack(range=gr, genome="mm9", name="random data", groups=factor(c(2,1,1,2), levels=c(1,2)), col=c("red", "orange"), degree = .8, family = c("symmetric", "gaussian"))

plotTracks(list(dtTrack1, dtTrack2), type=c("smooth", "p"))
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Thanks. It works when both levels and col are specified, but not if one of them is missing.

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@franceschinigianmarco-16472
Last seen 14 months ago

The best workaround I've found is to use overalyed tracks, plotting for each single track only one element, being points or line. In that way the color can be specified for each track. However I am still not able to set different alphas for overlaying tracks, probably because I'm missing something.

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