makeColorDarker: make R colors darker (or lighter)

In jmw86069/jamba: Jam Base Methods

make R colors darker (or lighter)

Description

Makes R colors darker or lighter based upon darkFactor

Usage

makeColorDarker(
  hexColor,
  darkFactor = 2,
  sFactor = 1,
  fixAlpha = NULL,
  verbose = FALSE,
  keepNA = FALSE,
  useMethod = 1,
  ...
)

Details

This function was originally intended to create border colors, or to create slightly darker colors used for labels. It is also useful for for making colors lighter, in adjusting color saturation up or down, or applying alpha transparency during the same step.

Note when colors are brightened beyond value=1, the saturation is gradually reduced in order to produce a visibly lighter color. The saturation minimu is set to 0.2, to maintain at least some amount of color.

See Also

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

Examples

colorV <- c("red","orange","purple","blue");
colorVdark2 <- makeColorDarker(colorV, darkFactor=2);
colorVlite2 <- makeColorDarker(colorV, darkFactor=-2);
showColors(cexCellnote=0.7,
   list(
   `darkFactor=2`=colorVdark2,
   `original colors`=colorV,
   `darkFactor=-2`=colorVlite2
   ));

# these adjustments work really well inside a network diagram
# when coloring nodes, and providing an outline of comparable
# color.
plot(x=c(1,2,1,2), y=c(1,2,2,1), pch=21,
   xaxt="n", yaxt="n", xlab="", ylab="",
   xlim=c(0.5,2.5), ylim=c(0.5,2.5),
   bg=colorV, col=colorVdark2, cex=4, lwd=2);
points(x=c(1,2,1,2), y=c(1,2,2,1), pch=20, cex=4,
   col=colorVlite2);

# Making a color lighter can make it easier to add labels
# The setTextContrastColor() function also helps.
text(x=c(1,2,1,2), y=c(1,2,2,1), 1:4,
   col=setTextContrastColor(colorVlite2));

jmw86069/jamba documentation built on March 26, 2024, 5:26 a.m.