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Re: undocumented IDL built-in TVRDC [message #2296 is a reply to message #2292]

Thu, 09 June 1994 22:21

landsman
Messages: 93
Registered: August 1991

Member

> In article <1994Jun9.182922.21061@noao.edu>,
> eharold@corona.sunspot.noao.edu (Elliotte Harold) wrote:
>
>> I recently ran across what appears to be an undocumented built-in
>> procedure in IDL 3.5 called TVRDC. I can't find a reference to it anywhere,

TVRDC is a synonym for the (documented) CURSOR command. Its origin goes
back to 1980's Version 1 IDL when the typical image processing environment
was a television display monitor controlled by a Tektronics or VT100 terminal.
Version 1 IDL then had a CURSOR command for reading the cursor off of a plot
on the Tektronics screen, and a TVRDC command to read the cursor on the
television display. In a workstation environment each window can be used
for image display or plotting, and the distinction between CURSOR and TVRDC
became unnecessary. CURSOR was chosen as the command for newer versions
of IDL, however TVRDC remained available as an undocumentd synonym. You
will find that TVRDC works exactly as documented under CURSOR.

--Wayne Landsman landsman@stars.gsfc.nasa.gov

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[Message index]

		Re: undocumented IDL built-in TVRDC By: velt on Mon, 13 June 1994 12:51
		Re: undocumented IDL built-in TVRDC By: jacobsen on Fri, 10 June 1994 14:07
		Re: undocumented IDL built-in TVRDC By: thompson on Fri, 10 June 1994 04:33
		Re: undocumented IDL built-in TVRDC By: landsman on Thu, 09 June 1994 22:21
		Re: undocumented IDL built-in TVRDC By: gurman on Thu, 09 June 1994 19:16

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