Add option to click corresponding points in a pairwise fashion before transform is first estimated

[m-albert]

Implements the proposed pairwise clicking mode detailed in #100:

Would it be an option to consider including a mode in which points are added in a pairwise fashion? We were thinking this would not necessarily need to change the current clicking flow but could be an option provided in an additional drop-down menu. Optionally, there could be a notification showing up how many more points are required before the transform can be estimated.

Let me know what you think @jni! Happy to include any changes / improvements.

Screenshot:

Update

After incorporating @jni's improvements and at the final state of the PR the plugin looks like this:

[jni]

Ha! I love the test it's very clever. 😊

Even though the tooltip is very good, I think "pairwise point addition mode" is fairly obscure, especially since eventually all modes are pairwise point addition modes. 😂 My alternative suggestion is to use an enum:

Initial point annotation = alternating / grouped by layer

Tooltip: Before affinder can have an initial transform estimate, it needs ndim + 1 points to match between reference and moving layers. In alternating mode, you pick one point in reference, then its corresponding point in moving, and so on. In grouped mode, you first pick ndim + 1 points in the reference layer, then ndim + 1 in the moving layer in the same order, before alternating.

[m-albert]

Thanks for your suggestions @jni which I completely agree with! Just pushed the changes.

[jni]

Thanks @m-albert! Would you mind appending an "Update" section to the original post with an up to date screenshot? That way the commit message will contain the picture corresponding to the final state of the PR. 🙏

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All modified and coverable lines are covered by tests ✅

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@@            Coverage Diff             @@
##             main     #101      +/-   ##
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+ Coverage   91.95%   92.32%   +0.37%     
==========================================
  Files           8        8              
  Lines         373      391      +18     
==========================================
+ Hits          343      361      +18     
  Misses         30       30              

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[m-albert]

@jni Done!

[jni]

This is now released as 0.5.0. 🥳

[m-albert]

Amazing, thank you @jni!