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.
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 westx=c(5,5)y = c(8,9)NSarrow(list(x=x, y=y), rot=25)