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Re: Top 10 IDL Requests [message #20912 is a reply to message #20666]

Mon, 31 July 2000 00:00

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

> "Kristian Kjaer" <Kristian.Kjaer@Risoe.Dk> wrote in message
news:3981DA40.F3BC8FC9@Risoe.Dk...
>
> A print button (and an equivalent cmd-line command) which would work
> on (direct) graphics already rendered to the screen (using std. direct
> graphics commands) would null _the_ major quirk in IDL, IMHO.

And how would it be done?

Once a direct graphics command has sent output to an output device, the only
"memory" IDL has of that command is the changed state of the output device.
At that point the system (or the user) has two ways of recreating the output
to a different device:

1. Switch devices & re-issue the same commands
2. Read the output back off the device and send it to the new device.

Number 1 is the method that users normally employ. It's hard to automate
because the graphics commands may well have change the state of the system
in all sorts of unknown ways. This is the method employed by David Fanning's
direct graphics objects. It's a brilliant idea but it has a major
limitation: it requires the user to bundle the graphics command in a single
routine that is "well-behaved", i.e. it can be run repeatedly & is
responsible for recreating all its data every time it is called.

Number 2 is already available for graphics windows via TVRD or the "copy to
clipboard" functionality on Windows. The graphics output is read back from
the output device as a raster image. This is pretty much useless when
redirected to a device with a different resolution.

The "directness" of IDL direct graphics is one of the main reasons for its
speed but also the source of fundamental limitations. It's because of these
fundamental limitations that RSI invented object graphics.

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield/
National Institute for Water and Atmospheric Research
PO Box 14-901, Wellington, New Zealand

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[Message index]

		Top 10 IDL Requests By: davidf on Sun, 16 July 2000 00:00
		Re: Top 10 IDL Requests By: Harvey Rarback on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Phillip David on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: promashkin on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Liam E. Gumley on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Struan Gray on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Martin Schultz on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Bruce Bowler on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Larry Ashim on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Richard Tyc on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Richard Tyc on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: anne on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: wmc on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Luis Alonso on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: Olivier ARCHER on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: hcp on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: richard hilton on Tue, 18 July 2000 00:00
		Re: Top 10 IDL Requests By: dsreyn on Mon, 24 July 2000 00:00
		Re: Top 10 IDL Requests By: Jeff Guerber on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: robert.m.candey.1[2] on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: noymer on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: promashkin on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Eric Vella on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Michael Asten on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Michael Asten on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: Michael Asten on Fri, 21 July 2000 00:00
		Re: Top 10 IDL Requests By: promashkin on Wed, 19 July 2000 00:00
		Re: Top 10 IDL Requests By: wmc on Wed, 19 July 2000 00:00
		Re: Top 10 IDL Requests By: kashyap on Wed, 19 July 2000 00:00
		Re: Top 10 IDL Requests By: Joseph B. Gurman on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: dsreyn on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: Larry Ashim on Wed, 26 July 2000 00:00
		Re: Top 10 IDL Requests By: kashyap on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: wmc on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: bradgom on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		LINUX Installation Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: Michael Asten on Tue, 25 July 2000 00:00
		Re: Top 10 IDL Requests By: Kristian Kjaer on Fri, 28 July 2000 00:00
		Re: Top 10 IDL Requests By: Nicolas Decoster on Thu, 27 July 2000 00:00
		Re: Top 10 IDL Requests By: Paul van Delst on Mon, 31 July 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Mon, 31 July 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Sun, 30 July 2000 00:00
		Re: Top 10 IDL Requests By: Liam E. Gumley on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: Paul van Delst on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Liam E. Gumley on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Liam E. Gumley on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Michael Plonski on Tue, 01 August 2000 00:00
		Multiple Inheritance (Top 10 IDL Requests) By: Martin Schultz on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Alex Schuster on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Fardal on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Tue, 01 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Mon, 31 July 2000 00:00
		Re: Top 10 IDL Requests By: Paul van Delst on Mon, 31 July 2000 00:00
		Re: Top 10 IDL Requests By: Paul van Delst on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: Benno Puetz on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: Michael Plonski on Wed, 02 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: promashkin on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Stephen Serjeant on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Nicolas Decoster on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Mark Hadfield on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Nick Bower on Fri, 04 August 2000 00:00
		Re: Top 10 IDL Requests By: Jeff Guerber on Thu, 03 August 2000 00:00
		Re: Top 10 IDL Requests By: dominik on Mon, 07 August 2000 00:00
		Re: Top 10 IDL Requests By: ottehoman on Fri, 11 August 2000 00:00
		Re: Top 10 IDL Requests By: Craig Markwardt on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: John-David T. Smith on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: ottehoman on Thu, 10 August 2000 00:00
		Re: Top 10 IDL Requests By: davidf on Sat, 12 August 2000 00:00
		Bottom 10 IDL requests ;-) was: Re: Top 10 IDL Requests By: wmc on Fri, 11 August 2000 00:00

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