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Re: Display two images on one position [message #28627]

Wed, 02 January 2002 14:57

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"Emmler, Oliver" <oemmler@ix.urz.uni-heidelberg.de> writes:

>> But this goes even further afield from "easy" than my
>> previous example, so I'm not sure it would meet
>> your criteria. :-)
>
> Thanks. I tried using your procedures. The scaling of the colortable/images
> will cause the picture to lose details. I think i have to use the following
> loop. Is there any way to speed it up ?
>
> FOR x = 0,510 DO BEGIN
> FOR y = 0,510 DO BEGIN
> IF highlight(x,y) NE 0 THEN TV, highlight(x:x+1,y:y+1),x,y
> ENDFOR
> ENDFOR

This may seem obvious, but if you only want to update a part of an
image, but keep the rest the same, why don't you keep a copy of the
preexisting screen image in memory. I.e., if you want to keep the
rest the same, then you better keep your own copy of the "rest." You
could wrap this in your own TV-like function.

pro mytv, img, highlight
common mytv_common, screenimg

if n_elements(screenimg) EQ 0 then begin
screenimg = img
endif else begin
wh = where(highlight, ct)
if ct then screenimg(wh) = img(wh)
endelse

tv, screenimg
end

Of course this is all toy code here, you have to deal with cases like
the image size changes, etc. Another possibility is to read the
screen image every time using TVRD() but that can get to be hairy with
true color, and/or a performance bottleneck.

Good luck,
Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: Display two images on one position By: Craig Markwardt on Wed, 02 January 2002 14:57
		Re: Display two images on one position By: Emmler, Oliver on Wed, 02 January 2002 07:14
		Re: Display two images on one position By: David Fanning on Mon, 24 December 2001 09:37
		Re: Display two images on one position By: Emmler, Oliver on Mon, 24 December 2001 00:51
		Re: Display two images on one position By: David Fanning on Sun, 23 December 2001 18:27
		Re: Display two images on one position By: David Fanning on Sun, 23 December 2001 14:57

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