tissot_map: Get last plot projection

In mdsumner/tissot: The Tissot Indicatrix

Get last plot projection

Description

'tissot_map()' will add the [world] coastline to any map.

Usage

tissot_map(..., add = TRUE)

tissot_abline(lambda, phi = NULL, ..., proj.in = NULL)

tissot_get_proj()

Arguments

...	graphical parameters for [lines()] if 'add = TRUE', or for [plot()] if 'add = FALSE'
add	logical, default 'TRUE' add to existing plot or create new
lambda	longitude at which to draw a vertical line
phi	latitude at which to draw a horizontal line
proj.in	projection for expert use

Details

'tissot_get_proj()' When the indicatrix is plotted it registers its projection. This string can be obtained with this getter function.

'tissot_abline()' will draw a vertical and horizontal line at a give longitude latitude (where they intersect is the actual lon,lat location)

Value

'tissot_map()' returns the internal world map data (projected if one is current) as a matrix

'tissot_abline()' called for its side effect of drawing on the plot

'tissot_get_proj()' returns the value of the current projection, or NULL

mdsumner/tissot documentation built on Jan. 16, 2024, 4:10 a.m.