Defining an arrow
zenarrow(turn, angle = 80, length = 1, coord.scale = 1)The direction in which the arrow will point ("l", "r", "d", "u")
The angle
The length of the arrow in [0,1] from tip to base
Scale the coordinates of the arrow
A 3-column matrix containing the (x,y) coordinates of the left edge end point, the arrow head and the right edge end point
Other graphical tools:
l_ispace_config(),
na_omit_loon(),
plot_region(),
vport()