| Re: Plot to Image [message #3493 is a reply to message #3405] |
Fri, 27 January 1995 11:49   |
chase
Messages: 62
Registered: May 1993
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Member |
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>>>> > "ryba" == ryba <ryba@ll.mit.edu> writes:
ryba> Not to nitpick (I'm sure the Z-buffer works, though the comment
ryba> about fonts gives me pause), but I've had perfectly fine results using
ryba> the X driver and the following..
ryba> window, /pixmap ; Create a new graphics window as a pixmap
ryba> (etc., including TVRD, TVLCT, WRITE_GIF)
ryba> Any comments on the difference between a X pixmap and a Z-buffer? I
ryba> guess if you are running a remote X-terminal it may matter. Also,
ryba> given the clunkiness of various X servers (like Sun's), maybe having
ryba> IDL do the memory management is better.
I specifically use a Z-buffer when I want to run IDL as a
background/batch process to create a bunch of images. Generally for
this situation I am not connected to an X server (for example, it
might be a job that I am running during the night or that I start from
a remote telnet connection). If IDL was running in the background
using the pixmap method, you would not be able to end your X session
and leave whenever you want (you would have to leave the X session
running until IDL was finished - tying up the server or leaving it
unattended for someone else to accidentally/maliciously tamper with)
If the IDL session is not connected to an X server the pixmap option
will not work. Additionally as was pointed out, when the X server is on
a different host from the IDL process you may see a performance hit
using TVRD(). The Z-buffer method is also protable to MS Windows or
Macintosh versions of IDL.
I am not familiar with the font problem alluded to in the previous
posts.
Chris
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The Applied Physics Laboratory
The Johns Hopkins University
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chris.chase@jhuapl.edu
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