fix: Livewire interpolation is weird

[wayfarer3130]

Context

Fixes [#5641]

Livewire interpolation currently interpolates the contour closure, which is a straight line originally. That causes display issues.

Changes & Results

Don't interpolate closure

Testing

Open segmentation mode on a volume
Active livewire with interpolation on (see 5641)
Draw contours around the outside of a body or other hard defined object separated by several slices
View the intermediate slices - the contour closure should be a straight line if the original contour was closed by a straight line and livewire if it was clsoed by clicking on the starting point.

Checklist

PR

• [] My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• [] My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• [] The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

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[jbocce]

@wayfarer3130 the code changes look fine. However, I tried testing it locally both with the contour interpolation example (i.e. bun run example interpolationcontoursegmentation) and locally linking OHIF to your branch. I still see the weird behaviour.

If and when you decide to make further changes, please consider adding @aimee-ferreira and at the very least she can test the live example.

ScreenHunter.Jan.07.13.29.mp4

[wayfarer3130]

@jbocce - my test cases were a little too consistent - when I vary the number of control points more it seems that it doesn't always interpolate between the control points correctly to lave a straight line across the end. The current change improves things, but I will need to think if there is a solution generally or not.

[jbocce]

The code changes look fine. I did a bit of testing and it seems good too. Great job. Please consider adding @aimee-ferreira for more thorough testing.

[wayfarer3130]

@aimee-ferreira - I just merged this PR into CS3D. The test class to use is interpolationcontoursegmentation.
You need to use the livewire interpolation tool. If you close by double click, with the tool showing a straight line (isUShapedOpenContour 'lineSegment'), then you need to match that with another contour several images away ALSO with a straight line segment.
If you close by clicking on the first point, then you need to match with another contour also clicking on the same point.