Gviz data track - how to color points, add horizontal line?

Question

[bsmith030465]

Hi,

I was trying to color code the data points in the DataTrack, and add a horizontal line. I couldn't find the information in the vignette. Here is what I want to do:

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library(Gviz)
values <- runif(15,0,1)
gr <- GRanges(seqnames=rep('chr1',15),ranges=IRanges(start=1:15,end=1:15))
mcols(gr) <- values
colnames(mcols(gr)) <- 'values'
mycols <- ifelse(values < 0.5,"red","blue")
dtrack <- DataTrack(gr,col=mycols)
plotTracks(dtrack)

==========

I only get one color for all the dots. Also, how can I add a horizontal line in this track?

many thanks!

[natasha.sernova]

Hopefully it will help:

http://watson.nci.nih.gov/bioc_mirror/packages/release/bioc/manuals/Gviz/man/Gviz.pdf

"

col="#0080FF": Integer or character scalar. Default line color setting for all plotting ele-

ments, unless there is a more specific control defined elsewhere.

col.axis="white": Integer or character scalar. The font and line color for the y axis, if any.

col.frame="lightgray": Integer or character scalar. The line color used for the panel frame, if frame==TRUE

col.grid="#808080": Integer or character scalar. Default line color for grid lines, both

when type=="g" in DataTracks and when display parameter grid==TRUE.

col.line=NULL: Integer or character scalar. Default colors for plot lines. Usually the same as the global col parameter

"