north.pointer {blighty} | R Documentation |
Function for drawing a north pointer on a blighty map
north.pointer(pos="AUTO")
pos |
Can be AUTO , select , or a vector with the coords. AUTO places the North pointer in the North-East corner of the map. select allows the user to select the centre of the N manually. Otherwise a vector of coordinates can be sent.
|
No return value
Draws a simple North pointer on a map. The postion refers to the centre of the N on the pointer.
You can't use this with other high level plotting commands (such as oz
) because blighty()
stores the mapping parameters from it's last invocation in an object called blighty.mapinfo
from which the position, and size, of the scale is calculated.
David Lucy <d.lucy@lancaster.ac.uk>http://www.maths.lancs.ac.uk/~lucy/
blighty() # draw coastline north.pointer(pos="AUTO") # automatic placing north.pointer() # same as above ## Not run: north.pointer(pos="select") # uses locator to find the position north.pointer(pos=c(500,500)) # vector to determine the centre of the # N of the pointer