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Setting data coordinates [message #35924]

Tue, 29 July 2003 15:33

mperrin+news
Messages: 81
Registered: May 2001

Member

I must confess to not fully understanding the "behind-the-scenes"
details of how IDL handles converting between device, data, and normal
coordinates in object graphics. I'd like to be able to explicitly
set the conversion to data coordinates myself sometimes, and I'm not
clear on how to do this. It's probably some system variable I need to
set, I assume, but the docs have been less than forthcoming with which one...

The application I have in mind is to display an image on screen, then
set the data-to-device coordinate conversion properly so that I can
then overplot points on my image (providing the points in data coordinates)
and have them appear in the correct location on screen (in device coordinates).
Should be simple, right? Any tips greatly appreciated.

- Marshall

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