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Box Axes with Map Function [message #82209]

Sun, 02 December 2012 08:53

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Folks,

I *finally* discovered a way to create box axes with
the function graphics Map function that are labeled
in the way we expect box axes to be labeled. There
are two keys.

First, make sure you use a LIMIT keyword on your
map projection and make sure the LATITUDE limits
do not touch -90 or 90 degrees. Without this, you
will get extraneous labels on your map.

Second, use two map projections so you can label
the axes appropriately.

Here is the code.

mp1 = map('Equirectangular', CENTER_LONGITUDE=180, $
POSITION=[0.1,0.1,0.90,0.75], $
LABEL_POSITION = 0, BOX_AXES=1, $
GRID_LATITUDE = 30, GRID_LONGITUDE = 45, $
/CURRENT, ASPECT_RATIO=0, LIMIT=[-89.99, 0, 89.99, 360])
mp1['Latitudes'].label_angle=90
mp1['Longitudes'].label_angle=0

; A second map projection is required to create the
; box axes correctly.
mp2 = map('Equirectangular', CENTER_LONGITUDE=180, $
POSITION=[0.1,0.1,0.90,0.75], $
LABEL_POSITION = 1, BOX_AXES=1, $
GRID_LATITUDE = 30, GRID_LONGITUDE = 45, $
/CURRENT, ASPECT_RATIO=0, LIMIT=[-89.99, 0, 89.99, 360])
mp2['Latitudes'].label_angle=270
mp2['Longitudes'].label_angle=0

; Something to see on the map.
c = MapContinents(Color=cgColor('tomato', /Triple, /Row))

I believe this requires IDL 8.2.1 to work correctly, although
I am not certain of this.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Box Axes with Map Function By: David Fanning on Sun, 02 December 2012 08:53
		Re: Box Axes with Map Function By: Matt[2] on Tue, 04 December 2012 12:34
		Re: Box Axes with Map Function By: David Fanning on Tue, 04 December 2012 10:10
		Re: Box Axes with Map Function By: Fabzi on Tue, 04 December 2012 09:30
		Re: Box Axes with Map Function By: Paul Van Delst[1] on Tue, 04 December 2012 09:05
		Re: Box Axes with Map Function By: David Fanning on Tue, 04 December 2012 07:36

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