kpText {karyoploteR} | R Documentation

## kpText

### Description

Plots the text given in `labels` at the positions defined by chr, x and y along the genome.

### Usage

    kpText(karyoplot, data=NULL, chr=NULL, x=NULL, y=NULL, labels=NULL, ymin=NULL, ymax=NULL, data.panel=1, r0=NULL, r1=NULL, clipping=TRUE, ...)

### Arguments

`karyoplot` | (a `KaryoPlot` object) This is the first argument to all data plotting functions of `karyoploteR`. A KaryoPlot object referring to the currently active plot.
`data` | (a `GRanges`) A GRanges object with the data. If `data` is present, `chr` will be set to `seqnames(data)` and `x` to the midpoints of the rages in data. If no parameter `y` is specified and `data` has a column named `y` or `value` this column will be used to define the `y` value of each data point. (defaults to NULL)
`chr` | (a charecter vector) A vector of chromosome names specifying the chromosomes of the data points. If `data` is not NULL, `chr` is ignored. (defaults to NULL)
`x` | (a numeric vector) A numeric vector with the positions (in base pairs) of the data points in the chromosomes. If `data` is not NULL, `x` is ignored. (defaults to NULL)
`y` | (a numeric vector) A numeric vector with the values of the data points. If `y` is not NULL, it is used instead of any data column in `data`. (defaults to NULL)
`labels` | (a character vector) The labels to be plotted. (defaults to NULL)
`ymin` | (numeric) The minimum value of `y` to be plotted. If NULL, it is set to the min value of the selected data panel. (defaults to NULL)
`ymax` | (numeric) The maximum value of `y` to be plotted. If NULL, it is set to the max value of the selected data panel. (defaults to NULL)
`data.panel` | (numeric) The identifier of the data panel where the data is to be plotted. The available data panels depend on the plot type selected in the call to `plotKaryotype`. (defaults to 1)
`r0` | (numeric) r0 and r1 define the vertical range of the data panel to be used to draw this plot. They can be used to split the data panel in different vertical ranges (similar to tracks in a genome browser) to plot differents data. If NULL, they are set to the min and max of the data panel, it is, to use all the available space. (defaults to NULL)
`r1` | (numeric) r0 and r1 define the vertical range of the data panel to be used to draw this plot. They can be used to split the data panel in different vertical ranges (similar to tracks in a genome browser) to plot differents data. If NULL, they are set to the min and max of the data panel, it is, to use all the available space. (defaults to NULL)
`clipping` | (boolean) Only used if zooming is active. If TRUE, the data representation will be not drawn out of the drawing area (i.e. in margins, etc) even if the data overflows the drawing area. If FALSE, the data representation may overflow into the margins of the plot. (defaults to TRUE)
`...` | The ellipsis operator can be used to specify any additional graphical parameters. Any additional parameter will be passed to the internal calls to the R base plotting functions.

### Details

This is one of the functions from karyoploteR implementing the adaptation to the genome context of basic plot functions from R base graphics. Given a set of positions on the genome (chromosome and base), a value (y) for each of them and a label, it plots the label at the position specified by the data point. Data can be provided via a `GRanges` object (`data`), independent parameters for chr, x and y or a combination of both. A number of parameters can be used to define exactly where and how the text is drawn. In addition, via the ellipsis operator (`...`), `kpText` accepts any parameter valid for `text` (e.g. `cex`, `col`, ...)

### Value

Returns the original karyoplot object, unchanged.

### See Also

`plotKaryotype`, `kpLines`, `kpPoints`

`kpPlotRegions`

### Examples

    set.seed(1000)
    data.points <- sort(createRandomRegions(nregions=500, mask=NA))
    mcols(data.points) <- data.frame(y=runif(500, min=0, max=1))

    kp <- plotKaryotype("hg19", plot.type=2, chromosomes=c("chr1", "chr2"))
      kpDataBackground(kp, data.panel=1)
      kpDataBackground(kp, data.panel=2)

      kpLines(kp, data=data.points, col="red")

      #Three ways of specifying the exact same data.points
      kpPoints(kp, data=data.points)
      kpPoints(kp, data=data.points, y=data.points$y, pch=16, col="#CCCCFF", cex=0.6)
      kpPoints(kp, chr=as.character(seqnames(data.points)),
               x=(start(data.points)+end(data.points))/2,
               y=data.points$y, pch=".", col="black", cex=1)

      #plotting in the data.panel=2 and using r0 and r1, ymin and ymax
      kpLines(kp, data=data.points, col="red", r0=0, r1=0.3, data.panel=2)
      kpText(kp, data=data.points, labels=as.character(1:500), r0=0, r1=0.3, data.panel=2, pch=".", cex=3)

      kpLines(kp, data=data.points, col="blue", r0=0.4, r1=0.7, data.panel=2)
      kpLines(kp, data=data.points, col="blue", y=-1*(data.points$y), ymin=-1, ymax=0, r0=0.7, r1=1, data.panel=2)
      #It is also possible to "flip" the data by giving an r0 > r1
      kpPoints(kp, data=data.points, col="red", y=(data.points$y), r0=1, r1=0.7, data.panel=2, pch=".", cex=2)

[Package karyoploteR version 1.12.4 Index]