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Re: how to save image in full size [message #48993]

Sun, 11 June 2006 09:32

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

> The coordinate system for a typical image is easy to set up,
> given a POSITION in the window, and XRANGE and YRANGE
> values that describe the extent of the coordinate system
> in X and Y. Here is the DRAW method of my coordinate object.

I probably should mention that the coordinate object
is "drawn" prior to any graphics (including the image)
being drawn into the window. This is so the data coordinate
system can be established. Once it is established, I can
convert from DEVICE or NORMAL coordinates to DATA coordinates
with the usual COORD_CONVERT. For example, if an overlay
position is chosen interactively in DEVICE coordinates
with the mouse, I can immediately convert it to DATA
coordinates when I save the overlay position in my program.

All output, then is done in DATA coordinates, which acts to
position overlays appropriately when displaying into a
window of any size. All that has to happen is that the
coordinate system is "drawn" prior to display.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: how to save image in full size By: David Fanning on Sun, 11 June 2006 09:32
		Re: how to save image in full size By: David Fanning on Sun, 11 June 2006 08:21
		Re: how to save image in full size By: heqjxiaoyao on Sun, 11 June 2006 17:54

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