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Geologic pattern fill scale

Source: R/patterns.R
scale_fill_geopattern.Rd

Fill scale using the FGDC Digital Cartographic Standard for Geologic Map Symbolization. Fill values should correspond to specific pattern codes (see "Details").

Usage

scale_fill_geopattern(na.value = "grey50", ...)

Arguments

na.value

The aesthetic value to use for missing (NA) values. May be either a color or a GridPattern object (such as that returned by geo_pattern()).

...

Arguments passed on to ggplot2::discrete_scale

scale_name

[Deprecated] The name of the scale that should be used for error messages associated with this scale.

name

The name of the scale. Used as the axis or legend title. If waiver(), the default, the name of the scale is taken from the first mapping used for that aesthetic. If NULL, the legend title will be omitted.

breaks

One of:

  • NULL for no breaks

  • waiver() for the default breaks (the scale limits)

  • A character vector of breaks

  • A function that takes the limits as input and returns breaks as output. Also accepts rlang lambda function notation.

minor_breaks

One of:

  • NULL for no minor breaks

  • waiver() for the default breaks (none for discrete, one minor break between each major break for continuous)

  • A numeric vector of positions

  • A function that given the limits returns a vector of minor breaks. Also accepts rlang lambda function notation. When the function has two arguments, it will be given the limits and major break positions.

labels

One of the options below. Please note that when labels is a vector, it is highly recommended to also set the breaks argument as a vector to protect against unintended mismatches.

  • NULL for no labels

  • waiver() for the default labels computed by the transformation object

  • A character vector giving labels (must be same length as breaks)

  • An expression vector (must be the same length as breaks). See ?plotmath for details.

  • A function that takes the breaks as input and returns labels as output. Also accepts rlang lambda function notation.

limits

One of:

  • NULL to use the default scale values

  • A character vector that defines possible values of the scale and their order

  • A function that accepts the existing (automatic) values and returns new ones. Also accepts rlang lambda function notation.

na.translate

Unlike continuous scales, discrete scales can easily show missing values, and do so by default. If you want to remove missing values from a discrete scale, specify na.translate = FALSE.

drop

Should unused factor levels be omitted from the scale? The default, TRUE, uses the levels that appear in the data; FALSE includes the levels in the factor. Please note that to display every level in a legend, the layer should use show.legend = TRUE.

guide

A function used to create a guide or its name. See guides() for more information.

call

The call used to construct the scale for reporting messages.

Details

For specific codes, see the "pattern numbers" in the full pattern chart for valid code values. Daven Quinn has also assembled more accessible documentation of the map patterns/codes and lithology patterns/codes. rmacrostrat::def_lithologies() can also be used to look up pattern codes for various lithologies (see the "fill" column). Note that codes associated with color variants (e.g., "101-M") are supported but will result in the default color variant instead (usually black and white, e.g., "101-K").

These patterns were originally processed and optimized by Daven Quinn and are hosted on GitHub.

Warning

Pattern fills are not supported on all graphics devices. Not all devices are under active development, and such devices are unlikely to add support for new features (such as pattern fills). The new features have only been implemented on a subset of graphics devices so far: cairo_pdf(), cairo_ps(), x11(type="cairo"), png(type="cairo"), jpeg(type="cairo"), tiff(type="cairo"), svg(), and pdf(). Although there is no support yet for quartz() or windows(), almost all of the graphics devices above will work on all major platforms. Further, the ragg and svglite packages contain graphics devices that support patterns. When using a graphics device where patterns are not supported, closed shapes will be rendered with a transparent fill. Note that, at least on Windows machines, the default device in RStudio and in the knitr package is png(), which does not support patterns. In RStudio, you can go to ‘Tools > Global Options > General > Graphics’ and choose the ‘Cairo PNG’ device from the dropdown menu to display patterns. Similar issues may arise when using RStudio on other operating systems.

See also

FGDC patterns: geo_pattern(), grid.pattern_geo()

Examples

library(ggplot2)
vals <- c("101", "313", "603", "733")
ggplot(mpg, aes(factor(cyl), fill = vals[factor(cyl)])) +
  geom_bar() +
  scale_fill_geopattern(name = NULL)