ternary_crosshairs: Add Cross-Hairs to a Ternary Plot

In isopleuros: Ternary Plots

Add Cross-Hairs to a Ternary Plot

Description

Draw lines that intersect at a point.

Usage

ternary_crosshairs(x, y, z, ...)

## S4 method for signature 'numeric,numeric,numeric'
ternary_crosshairs(x, y, z, x_mark = TRUE, y_mark = TRUE, z_mark = TRUE, ...)

## S4 method for signature 'ANY,missing,missing'
ternary_crosshairs(x, x_mark = TRUE, y_mark = TRUE, z_mark = TRUE, ...)

Arguments

x, y, z	A numeric vector giving the x, y and z ternary coordinates of a set of points. If y and z are missing, an attempt is made to interpret x in a suitable way (see grDevices::xyz.coords()).
...	Further graphical parameters (see graphics::par()) may also be supplied as arguments, particularly, line type, lty, line width, lwd and color, col. Also the line characteristics lend, ljoin and lmitre.
x_mark, y_mark, z_mark	A logical scalar: should the x, y or z axis component be drawn?

Value

ternary_crosshairs() is called it for its side-effects.

Author(s)

N. Frerebeau

See Also

Other geometries: ternary_arrows(), ternary_image(), ternary_labels(), ternary_lines(), ternary_points(), ternary_polygon(), ternary_segments(), ternary_text()

Examples

## Add cross-hairs
## Data from Aitchison 1986
ternary_plot(lava, panel.first = ternary_grid())
ternary_crosshairs(lava)

ternary_plot(lava, panel.first = ternary_grid())
ternary_crosshairs(lava, y_mark = FALSE, z_mark = FALSE, col = "red")

ternary_plot(lava, panel.first = ternary_grid())
ternary_crosshairs(lava, x_mark = FALSE, z_mark = FALSE, col = "green")

ternary_plot(lava, panel.first = ternary_grid())
ternary_crosshairs(lava, x_mark = FALSE, y_mark = FALSE, col = "blue")

isopleuros documentation built on April 3, 2025, 7:40 p.m.