colorlegend {destiny} | R Documentation

## Color legend

### Description

Creates a color legend for a vector used to color a plot. It will use the current `palette()` or the specified `pal` as reference.

### Usage

    colorlegend(col, pal = palette(), log = FALSE, posx = c(0.9, 0.93),
      posy = c(0.05, 0.9), main = NULL, cex_main = par("cex.sub"),
      cex_axis = par("cex.axis"), col_main = par("col.sub"),
      col_lab = par("col.lab"), steps = 5, steps_color = 100, digit = 2,
      left = FALSE, ..., cex.main = NULL, cex.axis = NULL, col.main = NULL,
      col.lab = NULL)

### Arguments

`col` | Vector of factor, integer, or double used to determine the ticks.
`pal` | If `col` is double, pal is used as a continuous palette, else as categorical one
`log` | Use logarithmic scale?
`posx` | Left and right borders of the color bar relative to plot area (Vector of length 2; 0-1)
`posy` | Bottom and top borders of color bar relative to plot area (Vector of length 2; 0-1)
`main` | Legend title
`cex_main` | Size of legend title font (default: subtitle font size `par('cex.sub')`)
`cex_axis` | Size of ticks/category labels (default: axis font size `par('cex.axis')`)
`col_main` | Color of legend title (default: subtitle color `par('col.sub')`)
`col_lab` | Color of tick or category labels (default: axis color `par('col.lab')`)
`steps` | Number of labels in case of a continuous axis. If 0 or FALSE, draw no ticks
`steps_color` | Number of gradient samples in case of continuous axis
`digit` | Number of digits for continuous axis labels
`left` | logical. If TRUE, invert posx
`...` | Additional parameters for the text call used for labels
`cex.main, cex.axis, col.main, col.lab` | For compatibility with `par`

### Details

When passed a factor or integer vector, it will create a discrete legend, whereas a double vector will result in a continuous bar.

### Value

This function is called for the side effect of adding a colorbar to a plot and returns nothing/NULL.

### Examples

    color_data <- 1:6
    par(mar = par('mar') + c(0, 0, 0, 3))
    plot(sample(6), col = color_data)
    colorlegend(color_data)

[Package destiny version 2.12.0 Index]