annoXaxis {plotgardener} | R Documentation

## Add an x-axis to a plot

### Description

Add an x-axis to a plot

### Usage

    annoXaxis(
        plot,
        at = NULL,
        label = TRUE,
        main = TRUE,
        scipen = 999,
        axisLine = FALSE,
        params = NULL,
        ...
    )

### Arguments

`plot` | Plot object to annotate with x-axis.
`at` | A numeric vector of x-value locations for tick marks.
`label` | A logical value indicating whether to draw the labels on the tick marks, or an expression or character vector which specify the labels to use. If not logical, must be the same length as the `at` argument.
`main` | A logical value indicating whether to draw the x-axis at the bottom of the plot. Default value is `main = TRUE`. Options are: `TRUE`: x-axis is drawn at the bottom of the plot. `FALSE`: x-axis is drawn at the top of the plot.
`scipen` | An integer indicating the penalty to be applied when deciding to print numeric values in fixed or exponential notation. Default value is `scipen = 999`.
`axisLine` | A logical value indicating whether to show the axis line. Default value is `axisLine = FALSE`.
`params` | An optional pgParams object containing relevant function parameters.
`...` | Additional grid graphical parameters. See gpar.

### Value

Returns a `xaxis` object containing relevant grob information.

### Examples

    ## Load transcript information
    library("TxDb.Hsapiens.UCSC.hg19.knownGene")
    library("org.Hs.eg.db")

    ## Create page
    pageCreate(width = 7.5, height = 4.5, default.units = "inches")

    ## Plot gene transcripts
    transcriptPlot <- plotTranscripts(
        chrom = "chr1",
        chromstart = 1000000,
        chromend = 2000000,
        assembly = "hg19",
        x = 0.5, y = 0,
        width = 6.5, height = 4,
        just = c("left", "top"),
        default.units = "inches"
    )

    ## Add standard x-axis to transcript plot
    annoXaxis(
        plot = transcriptPlot,
        at = c(1000000, 1250000, 1500000, 1750000, 2000000),
        fontsize = 8
    )
    plotText(
        label = "Basepairs", fontsize = 10, fontface = "bold",
        x = 3.75, y = 4.3, just = "top"
    )

    ## Hide page guides
    pageGuideHide()

[Package plotgardener version 1.0.17 Index]