arcs: Function to plot a set of great circle arcs between points

In adamkocsis/icosa: Global Triangular and Penta-Hexagonal Grids Based on Tessellated Icosahedra

Function to plot a set of great circle arcs between points

Description

Low level plotting of great circle arcs with lines

Usage

arcs(x, ...)

## S4 method for signature 'matrix'
arcs(x, breaks = 100, breakAtDateline = TRUE, plot = TRUE, ...)

Arguments

x	A matrix of longitude and latitude points (WGS 84 longlat)
...	Arguments passed to lines (par)
breaks	the number of points inserted between every points to draw great circle arcs.
breakAtDateline	Logical to indicate whether the lines are to be broken at the dateline.
plot	Logical value whether the plotting should be done at all (in case returned values are needed).

Value

Invisible return of a matrix of coordinates. If breakAtDateline = TRUE, then NA missing values will be inserted between coordinates where the lines cross the dateline.

Examples

# generate random points
set.seed(0)
example <- rpsphere(10, output="polar")

# plotting
plot(NULL, NULL, xlim=c(-180, 180), ylim=c(-90,90))
points(example)
text(label=1:nrow(example), example, pos=2)
arcs(example, col="red", breaks=200)

adamkocsis/icosa documentation built on Aug. 20, 2024, 1:35 a.m.