geom_Xisoprop {ggtern}

Fixed Value Isoproportion Lines

Description

Create fixed isoproportion lines for each of the ternary axes, geom_Xisoprop(...), (X = T, L, R) will draw an isoproportion line projecting from the T, L and R apex respectively.

Usage

geom_Tisoprop(
  mapping = NULL,
  data = NULL,
  ...,
  value,
  na.rm = FALSE,
  show.legend = NA
)

geom_Lisoprop(
  mapping = NULL,
  data = NULL,
  ...,
  value,
  na.rm = FALSE,
  show.legend = NA
)

geom_Risoprop(
  mapping = NULL,
  data = NULL,
  ...,
  value,
  na.rm = FALSE,
  show.legend = NA
)

Arguments

mapping

Set of aesthetic mappings created by aes(). If specified and inherit.aes = TRUE (the default), it is combined with the default mapping at the top level of the plot. You must supply mapping if there is no plot mapping.

data

The data to be displayed in this layer. There are three options:

If NULL, the default, the data is inherited from the plot data as specified in the call to ggplot().

A data.frame, or other object, will override the plot data. All objects will be fortified to produce a data frame. See fortify() for which variables will be created.

A function will be called with a single argument, the plot data. The return value must be a data.frame, and will be used as the layer data. A function can be created from a formula (e.g. ~ head(.x, 10)).

...

Other arguments passed on to layer(). These are often aesthetics, used to set an aesthetic to a fixed value, like colour = "red" or size = 3. They may also be parameters to the paired geom/stat.

value

the isoproportion ratio to draw

na.rm

If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.

show.legend

logical. Should this layer be included in the legends? NA, the default, includes if any aesthetics are mapped. FALSE never includes, and TRUE always includes. It can also be a named logical vector to finely select the aesthetics to display.

Aesthetics

geom_Tisopropunderstands the following aesthetics (required aesthetics are in bold):

• value

• alpha

• arrow

• colour

• linetype

• size

Author(s)

Nicholas Hamilton

Examples

data(Feldspar)
ggtern(data=Feldspar,aes(Ab,An,Or)) +
geom_Tisoprop(value=0.5) +
geom_Lisoprop(value=0.5) +
geom_Risoprop(value=0.5) +
geom_point()