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Re: TVimage and PlotS [message #40781 is a reply to message #40780]

Thu, 26 August 2004 06:15

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

James writes:

> Perhaps you can help me. The problem is - I want to display
> an 2D-image and then overplot the data using PlotS. It looks
> like that:
>
> ....
> TVIMAGE, image, POSITION=pos, /KEEP_ASPECT_RATIO
> PLOTS, X,Y, COLOR=100
> ....
>
> I tried to apply DATA or DEVICE keywords but without success.
> How to make the data perfectly fitted with the image ?

PLOTS is used to draw a line in a graphics window.
If you want to draw a line on your image, you have
to know where your image *is* in the window. Since
you used TVIMAGE to display your image, you *do* know
where it is. It is positioned in the window, in
normalized coordinates, according to the "pos" variable.

So I would try to draw lines on it in the same
normalized coordinates. For example, to draw a line
from the lower-left corner of the image to the
upper-right corner:

PLOTS, [pos[0], pos[1]], [pos[1], pos[3]], /Normal

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: TVimage and PlotS By: David Fanning on Thu, 26 August 2004 07:32
		Re: TVimage and PlotS By: James[1] on Thu, 26 August 2004 07:03
		Re: TVimage and PlotS By: David Fanning on Thu, 26 August 2004 06:15

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