> Hi Philippe,
>
> an overlay is a list (a java Vector) of Rois. You can step through all of
> these rois and manipulate them individually. Roughly like this (I have not
> tried it, beware of typos and mistakes)
>
> Roi[] myRois = myOverlay.toArray(); //convert vector to array
> for (int i=0; i myRois.length; i++) {
> Roi roi = myRois [i];
> roi.setLocation (newXforThisRoi, newYforThisRoi);
> }
>
> Don't forget imp.updateAndDraw() to show the modified image.
>
> If you have an Overlay all the rectangles are shown at the same time.
> If you want to show the rectangles one after another and keep them
> editable, don't use an overlay but imp.setRoi for each roi.
>
> Is this what you were asking for?
>
> Michael
> ________________________________________________________________
>
>
> On Nov 19, 2013, at 12:48, Philippe GENDRE wrote:
>
> > Thanks a lot Wayne. Your answer is very useful for me.
> >
> > Just one question more on this topic : do I have to create as overlay as
> > rois if I want to move each overlay/roi with a specific value ?
> >
> > Best regards,
> >
> > Philippe
> >
> >
> > 2013/11/19 Rasband, Wayne (NIH/NIMH) [E] <
[hidden email]>
> >
> >> On Nov 18, 2013, at 4:15 PM, Philippe GENDRE wrote:
> >>
> >>> Dear List,
> >>>
> >>> I need to retrieve the pixels of several ROIs in the same image and to
> >>> visualize these ROIs.
> >>>
> >>> To do that, inside a loop, I draw several rectangles corresponding to
> >> each
> >>> ROI (using the rectangular selection tool for example) and I use the
> >>> following lines to store the corresponding ROI and to visualize each of
> >>> them on the image which is a live stream :
> >>>
> >>> roi[i]=img.getRoi();
> >>> IJ.run("Add Selection...", "");
> >>>
> >>> My question is how to change (to translate) the ROIs *and* their
> >>> corresponding overlay ?
> >>
> >> You can use the Overlay.translate(x,y) method to translate the overlay.
> An
> >> overlay is essentially an array of ROIs so there is no need to maintain
> a
> >> second array. Here is JavaScript code that creates an overlay
> consisting of
> >> three rectangles, translates the overlay and then activates, one at a
> time,
> >> each of the three rectangles.
> >>
> >> -wayne
> >>
> >> imp = IJ.createImage("Untitled", "8-bit black", 500, 500, 1);
> >> overlay = new Overlay();
> >> overlay.add(new Roi(50, 50, 120, 120));
> >> overlay.add(new Roi(200, 150, 120, 120));
> >> overlay.add(new Roi(300, 300, 140, 120));
> >> imp.setOverlay(overlay);
> >> imp.show();
> >> IJ.wait(2000);
> >> overlay.translate(50, 50);
> >> imp.draw();
> >> IJ.wait(1000);
> >> rois = overlay.toArray();
> >> for (i=0; i<rois.length; i++) {
> >> imp.setRoi(rois[i]);
> >> IJ.wait(1000);
> >> }
> >>
> >> --
> >> ImageJ mailing list:
http://imagej.nih.gov/ij/list.html> >>
> >
> > --
> > ImageJ mailing list:
http://imagej.nih.gov/ij/list.html>
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