Implement Histogram1D if the same measurement is selected for both axes

[lazigu]

This PR implements plotting 1D histogram if the same measurement is selected for both axes. Currently, no clustering for this type of histogram is implemented. @zoccoler had an idea that clustering for such a histogram could be done with a span selector (the issue has not been created yet).
Partly closes #151, however, a separate issue regarding clustering 1D histograms should be created.

[codecov]

Codecov Report

Merging #237 (09414ca) into main (3a9edf9) will decrease coverage by 6.67%.
The diff coverage is 18.26%.

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
- Coverage   82.30%   75.63%   -6.67%     
==========================================
  Files          14       14              
  Lines        1565     1650      +85     
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- Hits         1288     1248      -40     
- Misses        277      402     +125     

Impacted Files	Coverage Δ
napari_clusters_plotter/_plotter_utilities.py	68.21% <12.00%> (-23.13%)	⬇️
napari_clusters_plotter/_plotter.py	65.83% <17.14%> (-10.49%)	⬇️
napari_clusters_plotter/_Qt_code.py	61.01% <19.04%> (-13.11%)	⬇️
napari_clusters_plotter/_tests/test_plotter.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[zoccoler]

Hi @lazigu , sorry for the delay!
I am implementing the span selector in this PR, so that it becomes complete.

[zoccoler]

The histogram still needs to be painted back with the right colors. As metnioned in the commit, somthing like this may work: https://stackoverflow.com/a/49290555/11885372

This is a work in progress.

[zoccoler]

Hi @lazigu, hi everyone, the span selection should be working now. The histogram colors now also get updated, having a similar behavior to the other plotting options (histogram 2d and scatter).

I renamed the HISTOGRAM_2D to just HISTOGRAM now. Whether it is 2D or not comes from the selected measurements.

If both measurements are the same, the histogram is 1D and a span selector is used instead of the lasso. Right-click should reset the clusters.

Could someone test before merging?

Best,
Marcelo

[haesleinhuepf]

I love it!