showColors: Show colors from a vector or list

In jamba: Just Analysis Methods Base

Show colors from a vector or list

Description

Show colors from a vector or list

Usage

showColors(
  x,
  labelCells = NULL,
  transpose = FALSE,
  srtCellnote = NULL,
  adjustMargins = TRUE,
  makeUnique = FALSE,
  doPlot = TRUE,
  ...
)

Arguments

x	one of these input types: character vector of colors function to produce colors, for example circlize::colorRamp2() list with any combination of character or function
labelCells	logical whether to label colors atop the color itself. If NULL (default) it will only display labels with 40 or fewer items on either axis.
transpose	logical whether to transpose the colors to display top-to-bottom, instead of left-to-right.
srtCellnote	numeric angle to rotate text when labelCells=TRUE. When set to NULL, labels are vertical srtCellnote=90 when transpose=FALSE and horizontal srtCellnote=0 when transpose=TRUE.
adjustMargins	logical indicating whether to call adjustAxisLabelMargins() to adjust the x- and y-axis label margins to accomodate the label size. Note when an axis is hidden by using xaxt="n" or xaxt="n", the respective margin will not be adjusted. The arguments in ... take precedence over graphics::par(), when deciding whether to adjust margins. However if xaxt="s" and graphics::par("xaxt"="n") the margin will be adjusted but not displayed. In this way the axes can be adjusted without displaying the labels, so the labels can be rendered later if needed.
makeUnique	logical indicating whether to display only the first unique color. When x is supplied as a list this operation will display the first unique color for each list element. Also, when x is a list, just to be fancy, makeUnique is recycled to length(x) so certain list elements can display unique values, while others display all values.
doPlot	logical indicating whether to produce a visual plot. Note this function returns the color matrix invisibly.
...	additional parameters are passed to imageByColors().

Details

This function simply displays colors for review, using imageByColors() to display colors and labels across the plot space.

When supplied a list, each row in imageByColors() represents an entry in the list. Nothing fancy.

Value

invisible color matrix used by imageByColors(). When the input x is empty, or cannot be converted to colors when x contains a function, the output returns NULL.

See Also

Other jam plot functions: adjustAxisLabelMargins(), coordPresets(), decideMfrow(), drawLabels(), getPlotAspect(), groupedAxis(), imageByColors(), imageDefault(), minorLogTicksAxis(), nullPlot(), plotPolygonDensity(), plotRidges(), plotSmoothScatter(), shadowText(), shadowText_options(), sqrtAxis(), usrBox()

Other jam color functions: alpha2col(), applyCLrange(), col2alpha(), col2hcl(), col2hsl(), col2hsv(), color2gradient(), fixYellow(), fixYellowHue(), getColorRamp(), hcl2col(), hsl2col(), hsv2col(), isColor(), kable_coloring(), makeColorDarker(), rainbow2(), rgb2col(), setCLranges(), setTextContrastColor(), unalpha(), warpRamp()

Examples

x <- color2gradient(list(Reds=c("red"), Blues=c("blue")), n=c(4,7));
showColors(x);

showColors(getColorRamp("firebrick3"))

if (requireNamespace("RColorBrewer", quietly=TRUE)) {
   RColorBrewer_namelist <- rownames(RColorBrewer::brewer.pal.info);
   y <- lapply(nameVector(RColorBrewer_namelist), function(i){
      n <- RColorBrewer::brewer.pal.info[i, "maxcolors"]
      j <- RColorBrewer::brewer.pal(n, i);
      nameVector(j, seq_along(j));
   });
   showColors(y, cexCellnote=0.6, cex.axis=0.7, main="Brewer Colors");
}
if (requireNamespace("viridisLite", quietly=TRUE)) {
   # given one function name it will display discrete colors
   showColors(viridisLite::viridis)
   # a list of functions will show each function output
   showColors(list(viridis=viridisLite::viridis,
      inferno=viridisLite::inferno))

   # grab the full viridis color map
   z <- rgb2col(viridisLite::viridis.map[,c("R","G","B")]);
   # split the colors into a list
   viridis_names <- c(A="magma",
      B="inferno",
      C="plasma",
      D="viridis",
      E="cividis",
      F="rocket",
      G="mako",
      H="turbo")
   y <- split(z,
      paste0(viridisLite::viridis.map$opt, ": ",
      viridis_names[viridisLite::viridis.map$opt]));
   showColors(y, labelCells=TRUE, xaxt="n", main="viridis.map colors");
}

# demonstrate makeUnique=TRUE
j1 <- getColorRamp("rainbow", n=7);
names(j1) <- seq_along(j1);
j2 <- rep(j1, each=3);
names(j2) <- makeNames(names(j2), suffix="_rep");
j2
showColors(list(
   j1=j1,
   j2=j2,
   j3=j2),
   makeUnique=c(FALSE, FALSE, TRUE))

jamba documentation built on April 4, 2025, 5:14 a.m.