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Re: Moving an ROI [message #28408 is a reply to message #28325]

Wed, 05 December 2001 08:55

Pavel A. Romashkin
Messages: 531
Registered: November 2000

Senior Member

Nobody replied. I guess a routine is not there. But it seems simple to
write one. Once you have a ROI, all it is is just a polygon. With motion
events on, just add delta X and Y to its Data property and redraw the view.
Edges need a special thought, seems to me. First, have you decided how
do *you* want them treated? If you trim the ROI, you need to redefine
Data because IDLgrPolygon has no *Range properties. I did this by
keeping the original ROI data in Uvalue, then trimming Data as Data =
[[X_min < Data[0,*] < X_max], [Y_min < Data[1,*] < Y_max], [Data[2,*]],
then redrawing.
If you want to expand the plot range as ROI gets dragged past the edge,
you need to rescale the plot and change axes limits. Although I
anticipate somewhat jerky screen updates with large plots, it also seems simple.
For data processing, just reuse the data from Uvalue (the original ROI).

Pavel

Andre Kyme wrote:
>
> Hi everybody,
>
> Anyone know of a routine to move an ROI around in a draw widget? I've
> collected the ROI coordinates and now want to adjust its position. Wrote
> a bit of code that's kind of working but is very dodgy when the ROI gets
> to edges. Thanks for the help,
>
> Andre Kyme
>
> Dept Medical Physics
> Westmead Hospital

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[Message index]

		Moving an ROI By: Andre Kyme on Tue, 04 December 2001 13:35
		Re: Moving an ROI By: Pavel A. Romashkin on Thu, 06 December 2001 08:32
		Re: Moving an ROI By: Andre Kyme on Thu, 06 December 2001 17:00
		Re: Moving an ROI By: Andre Kyme on Wed, 05 December 2001 13:55
		Re: Moving an ROI By: Pavel A. Romashkin on Wed, 05 December 2001 08:55

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