styleColorBar_divergent {GeneTonic} | R Documentation

## Style DT color bars

### Description

Style DT color bars for values that diverge from 0.

### Usage

    styleColorBar_divergent(data, color_pos, color_neg)

### Arguments

`data` | The numeric vector whose range will be used for scaling the table data from 0-100 before being represented as color bars. A vector of length 2 is acceptable here for specifying a range possibly wider or narrower than the range of the table data itself.
`color_pos` | The color of the bars for the positive values
`color_neg` | The color of the bars for the negative values

### Details

This function draws background color bars behind table cells in a column, width the width of bars being proportional to the column values and the color dependent on the sign of the value.

A typical usage is for values such as `log2FoldChange` for tables resulting from differential expression analysis. Still, the functionality of this can be quickly generalized to other cases - see in the examples.

The code of this function is heavily inspired from styleColorBar, and borrows at full hands from an excellent post on StackOverflow - https://stackoverflow.com/questions/33521828/stylecolorbar-center-and-shift-left-right-dependent-on-sign/33524422#33524422

### Value

This function generates JavaScript and CSS code from the values specified in R, to be used in DT tables formatting.

### Examples

    data(res_de_macrophage, package = "GeneTonic")
    res_df <- deseqresult2df(res_macrophage_IFNg_vs_naive)
    library("magrittr")
    library("DT")
    DT::datatable(res_df [1:50, ],
                  options = list(
                    pageLength = 25,
                    columnDefs = list(
                      list(className = "dt-center", targets = "_all")
                    )
                  )
    ) %>%
      formatRound(columns = c("log2FoldChange"), digits = 3) %>%
      formatStyle(
        "log2FoldChange",
        background = styleColorBar_divergent(res_df$log2FoldChange,
                                             scales::alpha("navyblue", 0.4),
                                             scales::alpha("darkred", 0.4)),
        backgroundSize = "100% 90%",
        backgroundRepeat = "no-repeat",
        backgroundPosition = "center"
      )

    simplest_df <- data.frame(
      a = c(rep("a",9)),
      value = c(-4, -3, -2, -1, 0, 1, 2, 3, 4)
    )

    # or with a very simple data frame
    DT::datatable(simplest_df) %>%
      formatStyle(
        'value',
        background = styleColorBar_divergent(simplest_df$value,
                                             scales::alpha("forestgreen", 0.4),
                                             scales::alpha("gold", 0.4)),
        backgroundSize = "100% 90%",
        backgroundRepeat = "no-repeat",
        backgroundPosition = "center"
      )

[Package GeneTonic version 1.0.1 Index]