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Don't restrict transformed point dim to input point dim in poly_convert #4584

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Description

Fixes MakieOrg/GeoMakie.jl#282

Previously, if you had 2D polygon and a 2D -> 3D transform func, the points would be transformed, and the resulting Point3 would be coerced back down to Point2. This is likely also why a lot of the triangulation was wrong.

This PR removes the element type constraint on the array returned from apply_transform, thus allowing 3D points to stay 3D.

I have a suspicion that if we merge this, it will break plotting polygons in 3d. It might need a very basic generic overload of GeometryBasics.earcut_triangulate for arbitrary dimensions, to restrict to 2D - at least for now.

Type of change

Delete options that do not apply:

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

  • Added an entry in CHANGELOG.md (for new features and breaking changes)
  • Added or changed relevant sections in the documentation
  • Added unit tests for new algorithms, conversion methods, etc.
  • Added reference image tests for new plotting functions, recipes, visual options, etc.

@asinghvi17
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If this makes sense, I'll go ahead and add tests etc.

@MakieBot
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Benchmark Results

SHA: ab0afb3ad3444fccfdf9188d71a97857cf10a189

Warning

These results are subject to substantial noise because GitHub's CI runs on shared machines that are not ideally suited for benchmarking.

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CairoMakie
WGLMakie

points = Vector{PT}[apply_transform(transform_func, outer)]
# Note that this should not be coerced to be a `Vector{PT}`,
# since `apply_transform` can change points from e.g 2D to 3D.
points = [apply_transform(transform_func, outer)]
points_flat = PT[outer;]
for inner in polygon.interiors
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Some tests would be nice.
What about the PT[outer;]?

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That is fine, since points_flat contains the original points.

Will add some tests!

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Empty/deformed Polygons with LScene
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