http://imagej.273.s1.nabble.com/roiencoder-decoder-issue-different-roi-hashcode-or-just-me-tp5013390p5013392.html
I may have to implement it myself(as of need). I haven't found it in the
polygon class. Is it worth writing it or am I reinventing the wheel?
> Hi Felipe,
>
> > Is the hashcode based only on the polygon and position or maybe also
> > in other variables lost or unrecovered in the encode-decode process?
>
> If you look at the source code [1], the Roi classes do not actually
> implement the hashCode() method (in fact, nothing whatsoever in ImageJ1
> does). So the Object implementation is inherited, which hashes on the
> object reference, meaning it will be different every time you create a new
> one (even if the coordinates etc. of the ROI are identical).
>
> It's true that Roi implements a different method called getHashCode() [2],
> but that does an XOR with hashCode(), so it will also differ every time in
> a similar way.
>
> Regards,
> Curtis
>
> [1]
>
https://github.com/imagej/ImageJA/blob/v1.49v/src/main/java/ij/gui/Roi.java> [2]
>
>
https://github.com/imagej/ImageJA/blob/v1.49v/src/main/java/ij/gui/Roi.java#L1947-L1952>
> On Wed, Jul 1, 2015 at 4:48 PM, Felipe Contreras <
[hidden email]>
> wrote:
>
> > Hi!
> >
> > I'm not quite sure if I'm saving and recovering rois properly.
> > When I compare the roi hashcode from before and after saving it seems to
> > change.
> > Is the hashcode based only on the polygon and position or maybe also in
> > other variables lost or unrecovered in the encode-decode process?
> > Am I missing something?
> >
> > To save I use:
> > RoiEncoder re = new RoiEncoder(roiPath);
> > re.write(roi);
> >
> > To load I use:
> > roi = RoiDecoder.open(roiPath);
> >
> >
> > Thanks a lot!
> >
> > Felipe
> >
> > --
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http://imagej.nih.gov/ij/list.html> >
>
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