Check and manipulate colors

Check and manipulate the default color values.

Usage

edma_colors(n,
    type=c("diverging", "sequential", "qualitative"),
    alpha=1, rev=FALSE)

plot_edma_colors(n=9, maxq=9)

Arguments

n: the number of colors (>0) to be in the palette.
type: the type of palette.
alpha: the alpha transparency, a number in [0,1].
rev: logical, should colors be reversed.
maxq: maximum number of qualitative colors to plot.

Details

edma_colors create a vector of n colors based on the settings in getOption("edma_options").

The options can be set via options (see Examples). The options can either be the name of a palette hcl.colors. When the option is set to multiple values, those are treated as colors to be interplolated with colorRampPalette. For qualitative palettes, the color values are used directly (recycled as needed).

Sequential palettes are produced as the higher half of the diverging palette for consistency.

Value

edma_colors returns a vector of hax color codes, plot_edma_colors produces a plot with the diverging, sequential, and qualitative default palettes given settings in getOption("edma_options").

Author

Peter Solymos

Examples

## default palettes
plot_edma_colors(101)


## change default palettes
op <- options("edma_options" = list(
    diverging = "Green-Orange",
    qualitative = "Dark 2"))
plot_edma_colors(101)


## use color names
options("edma_options" = list(
    diverging = c("black", "grey", "pink"),
    qualitative = "Warm"))
plot_edma_colors(101)


## reset defaults
options(op)
plot_edma_colors(101)