hyperspectral point picker

[ianhi]

Problem

It's annoying to look at hyperspectral raman images.

Proposed Solution

A la heatmap slicer two subplots

• left subplot is an array chosen by the user (i.e. a bright field image) or fallback to the first slice of the spectrum

• clicking on the image will populate the right subplot with the full spectrum at clicked point

• there should be two radii associated with clicking:

  • display radius (unsure if figure or data coords?)
  • data radius : if >0 then include the average of multiple points although maybe those should be the same? The issue i'm trying to get around is that if you only label a single pixel it's way too small. Maybe like this: if data_radius =0 # i.e. single pixel: mark the point with an x else: draw a circle

• right click to remove points

Additional context

hyperspy has essentially exactly the above already: http://hyperspy.org/hyperspy-doc/current/user_guide/visualisation.html#multidimensional-spectral-data

I think the argument for adding it here is that this could be useful to people outside of hyperspectral imaging. It also feels a bit more transparent to me to work with numpy arrays than have to learn another libary. idk though maybe this isn't worth it

[ianhi]

Should allow for BF and spectrum arrays to have different XY dimensions so long as a transform is provided between them

[ianhi]

actuallt the hyperspy version isn't exactly the same as what's proposed here. I think that for them the plot that you click on is always made out of the spectra. there's no allowance for BF images

[ianhi]

I think that this should follow in the footsteps of the scatter_selector introduced in #141 and there should be a image_position_click widget or soemthing with a more meanigful name. It could also have a transform argument that allows for transforming the (x,y) -> (X, Y) which defaults to the unitary transform

[ianhi]

This probably belongs elsewhere or at the very least could be built with/inpsired by https://github.com/ianhi/mpl-point-clicker