On Oct 3, 2014, at 12:42 PM, Rats wrote:
> Hello All!
>
> I'm exporting the outlines of objects from wand selections using
> interpolated FloatPolygons. This part works fine, and shows you what you're
> getting on the image as an overlay, but I'd like to be able to interact a
> little more with the overlay, dragging parts of it (individual ROIs) to new
> locations and having ImageJ recalculate the co-ordinate list.
>
> Is it possible to use the mouse to drag around parts of an overlay without
> hunting through the ROI manager?
An overlay is just a collection of ROIs. An ROI in an overlay can by activated by long-clicking on it, alt-clicking on it or clicking on its label. You can drag an overlay ROI once it has been activated. In ImageJ 1.49h or later, you can drag an overlay ROI by its label without first activating it. Use the Image>Overlay>Labels command to enable overlay labels.
> And are there events I can use to call the
> sampling methods on releasing the overlay once I've dragged it into
> position?
You can monitor the mouse up events that occur when when an overlay is dragged into position. The Mouse Listener plugin at
http://imagej.nih.gov/ij/plugins/mouse-listener.htmldemonstrates how to monitor mouse events.
-wayne
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