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Re: IDL graphics w/ no display [message #41496 is a reply to message #41354]

Wed, 27 October 2004 05:48

btt
Messages: 345
Registered: December 2000

Senior Member

Ken Mankoff wrote:

>
>>> I think I cannot use object graphics because I am working with map
>>> projections, map_continents, etc. and these don't work with object
>>> graphics, right?
>>
>>

Hi,

(1) About OG without a display device.

I think you canuse the IDLgrBuffer as the destination drawing device. The
following works without X11 (MacOSX).

x = findgen(361)*!dtor
y = sin(x)
oplot = obj_new('IDLgrPlot', x,y)
omodel = obj_new('idlgrModel')
omodel->Add, oplot
oview = obj_new('idlgrview', viewplane_rect = [0,-1,!pi*2,2])
oview->Add, omodel
obuffer = obj_new('idlgrbuffer')
obuffer->draw, oview
oimage = obuffer->Read()
oimage->GetProperty, data = img
write_png, 'bufferimage.png', img

(2) I think that the iMap might be disguising how easy it can be to transform
map polygons into the OG realm. I recall a thread on this newsgroup where
somebody tessalated the Polygons for Alaska and then threw them into an object
graphics destination. (I think it was Karl - but I haven't found that thread.)
With the advent of the MAP_PROJ_***** routines, it sure seems like RSI has
freed mapping from the DG world. So, somewhere in iMap, the CIA map data (or
the Shape file data) that comes with IDL is unpacked and then formed into OG
polygons. That said, I have no experience with OG mapping although I started
down that path once in an idle moment.

Cheers,
Ben

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[Message index]

		Re: IDL graphics w/ no display By: David Fanning on Wed, 27 October 2004 01:25
		Re: IDL graphics w/ no display By: David Fanning on Wed, 27 October 2004 01:16
		Re: IDL graphics w/ no display By: Ken Mankoff on Tue, 26 October 2004 18:29
		Re: IDL graphics w/ no display By: Jeff Guerber on Tue, 26 October 2004 15:57
		Re: IDL graphics w/ no display By: David Fanning on Tue, 26 October 2004 14:57
		Re: IDL graphics w/ no display By: Jeff Guerber on Tue, 26 October 2004 13:57
		Re: IDL graphics w/ no display By: K. Bowman on Mon, 25 October 2004 07:06
		Re: IDL graphics w/ no display By: David Fanning on Mon, 25 October 2004 03:20
		Re: IDL graphics w/ no display By: btt on Wed, 27 October 2004 05:48

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