Get and set options for shadowText

Get and set options for shadowText

shadowText_options(
  r = getOption("jam.shadow.r", 0.15),
  n = getOption("jam.shadow.n", 8),
  outline = getOption("jam.outline", TRUE),
  alphaOutline = getOption("jam.alphaOutline", 0.4),
  shadow = getOption("jam.shadow", FALSE),
  shadowColor = getOption("jam.shadowColor", "black"),
  alphaShadow = getOption("jam.alphaShadow", 0.2),
  r_ex = 1,
  alpha_ex = 1,
  preset = c("none", "default", "bold", "bold white", "bold black", "both", "shadow",
    "bold shadow", "bold white shadow", "bold black shadow", "bold both"),
  verbose = FALSE,
  ...
)

Arguments

r

numeric radius used for outline or shadow

n

numeric number of shadow steps to render around each text label

outline

logical indicating whether to render shadowText as an outline (default), or when outline=FALSE it renders a drop shadow offset using offset which by default is slightly down and to the right of the text labels.

alphaOutline

numeric value for alpha transparency used for label outlines when outline=TRUE, with values expected between 0 (fully transparent) and 1 (not transparent).

shadow

logical indicating whether to render shadowText as a shadow, or not (default).

shadowColor

character R color which defines the color used for the outline or shadow for each text label.

alphaShadow

numeric value for alpha transparency used for label shadows when shadow=TRUE, with values expected between 0 (fully transparent) and 1 (not transparent).

r_ex

numeric expansion factor used to adjust the radius r. The value for r is defined based upon the arguments provided, then is multiplied by the r_ex expansion factor. The result is stored in option "jam.shadow.r".

alpha_ex

numeric expansion factor used to adjust the alpha transparency of both alphaOutline and alphaShadow. Values will be maintained no lower than 0 and no higher than 1. The values for alphaOutline and alphaShadow are defined based upon the arguments provided, then are multiplied by the alpha_ex expansion factor. The result is clipped to range 0,1 using jamba::noiseFloor(). The resulting values are stored in options "jam.alphaOutline" and "jam.alphaShadow", respectively.

preset

character string which defines a preset with associated settings. Any value other than "none" will cause all other options to use the preset settings.

• "none": no preset settings are applied

• "default": reverts all options to the original default values, which produces an outline, and not a drop shadow. The color will use shadowColor which allows using all other settings from this preset, except with custom color.

• "bold": makes output produce visibly more distinct outline, with no drop shadow. The color will use shadowColor which allows using all other settings from this preset, except with custom color.

• "bold white": same as "bold" except default text color is white

• "bold black": same as "bold" except default text color is black

• "both": applies "default" and enables drop shadow

• "shadow": uses suggested default values to produce a drop shadow, and not an outline. The color will use shadowColor which allows using all other settings from this preset, except with custom color.

• "bold shadow": same as "shadow" except the shadow is more distinct. The color will use shadowColor which allows using all other settings from this preset, except with custom color.

• "bold white shadow": same as "bold shadow" with white shadow

• "bold black shadow": same as "bold shadow" with black shadow

• "bold both": same as "bold" except also enables bold shadow

verbose

logical indicating whether to print verbose output

...

additional arguments are ignored.

reset

logical indicating whether to reset values to their respective defaults, prior to applying any other updates

Value

list with the following options for shadowText():

• jam.shadow.r

• jam.shadow.n

• jam.outline

• jam.alphaOutline

• jam.shadow

• jam.shadowColor

• jam.alphaShadow

Details

This function is intended to be a convenient method to get and set options to be used with jamba::shadowText(). This function stores the resulting values in options() for use by shadowText().

See also

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

Examples

nullPlot(doBoxes=FALSE, xlim=c(-1, 4), ylim=c(-1, 4), asp=1);
usrBox(fill="grey")
cex <- 1.2
axis(1);axis(2, las=2)
shadowText_options(preset="default")
shadowText(x=0, y=3, "default", cex=cex)
shadowText_options(preset="bold")
shadowText(x=0, y=2, "bold", cex=cex)
shadowText_options(preset="bold white")
shadowText(x=0, y=1, col="black", "bold white", cex=cex)
shadowText_options(preset="bold black")
shadowText(x=0, y=0, col="white", "bold black", cex=cex)
shadowText_options(preset="shadow")
shadowText(x=3, y=3, "shadow", cex=cex)
shadowText_options(preset="bold shadow")
shadowText(x=3, y=2, "bold shadow", cex=cex)
shadowText_options(preset="bold white shadow")
shadowText(x=3, y=1, col="black", "bold white shadow", cex=cex)
shadowText_options(preset="bold black shadow")
shadowText(x=3, y=0, col="white", "bold black shadow", cex=cex)
shadowText_options(preset="both")
shadowText(x=1.5, y=3, col="white", "both", cex=cex)
shadowText(x=1.5, y=2.5, col="black", "both", cex=cex)
shadowText_options(preset="bold both")
shadowText(x=1.5, y=2, col="white", "bold both", cex=cex)
shadowText(x=1.5, y=1, col="black", "bold both", cex=cex)
shadowText(x=1.5, y=0.5, col="blue3", "bold both", cex=cex, font=2)
shadowText(x=1.5, y=0, col="indianred1", "bold both", cex=cex, font=2)

shadowText_options(preset="default")