NSarrow {GEOmap}R Documentation

North-South Weather Vane Arrow

Description

Add north-south weather vane arrow figure

Usage

NSarrow(x = NULL, y = NULL, R = 1, col.arrow = 1, col.N = 1, col.circ = 1, rot = 0, PMAT = NULL)

Arguments

x X-location vector, if list, include both x and y values
y Y-location vector, not needed if x is a list
R radius, in plot coordinates
col.arrow color for arrow, default="black"
col.N color for N symbol
col.circ color for circle
rot rotation angle, degrees
PMAT projection matrix, output of persp

Details

The location list should have 2 values for x and y each, the second value for y determines the radius R if it is not provided. The first element of y is the center of the weather vane. If no x-list is provided, the interactive locator function is invoked and a list is returned for future work.

Value

x x-location
y y-location

Author(s)

Jonathan M. Lees<jonathan.lees@unc.edu>

See Also

zebra

Examples


plot(c(1:10), c(1:10), type='n')

x=c(2,2)
y = c(8,9)

NSarrow(list(x=x, y=y))

##### move over and repeat, with rotation of 25 degrees west

x=c(5,5)
y = c(8,9)

NSarrow(list(x=x, y=y), rot=25)




[Package GEOmap version 1.4-2 Index]