Anti aliasing - always a boolean

[gselzer]

This PR fleshes out the anti-aliasing field applicable to a few different node types (it'll be a draft until they're all done):

• Points
• Line
• Text

Previously, only Points carried anti-aliasing state - the parameter Points.antialiasing was a float because:

• VisPy's Markers nodes have a antialias: float
• pygfx PointsMaterial uses a bool.

This on its own might warrant using a float, but considering that:

• both vispy and pygfx use a boolean for lines
• pygfx uses a boolean for Text
• vispy doesn't have a dedicated antialiasing parameter for text,

I'm thinking it's best to be uniform with bools across the field for now. (Note that I started looking into this because I really wanted antialiased text in pygfx).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.77%. Comparing base (2d5ea31) to head (4d86c5a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   87.73%   87.77%   +0.03%     
==========================================
  Files          62       62              
  Lines        2838     2846       +8     
==========================================
+ Hits         2490     2498       +8     
  Misses        348      348              

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[gselzer]

@tlambert03 any quick opinions here on the anti-aliasing boolean fields? (In-depth review also welcome but probably unnecessary)

[Copilot]

Pull request overview

Unifies the antialias API across Points, Line, and Text nodes by making it a boolean in the model layer, and wires the new behavior through both vispy and pygfx adaptors with corresponding test updates.

Changes:

• Change antialias in Points and Line from float to bool, and add antialias: bool to Text.
• Update vispy/pygfx adaptors to consume boolean antialiasing (including vispy Markers float mapping and pygfx material aa wiring).
• Update adaptor tests and add a new examples/antialiasing.py demonstration.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/adaptors/_vispy/test_text.py	Adds antialias to Text fixture construction.
tests/adaptors/_vispy/test_points.py	Updates points AA tests to boolean model + vispy float mapping.
tests/adaptors/_vispy/test_line.py	Refactors line tests and adds AA coverage (vispy backend).
tests/adaptors/_pygfx/test_text.py	Adds AA test for pygfx text material.
tests/adaptors/_pygfx/test_points.py	Updates points AA tests to boolean model.
tests/adaptors/_pygfx/test_line.py	Refactors line tests and adds AA coverage (pygfx backend).
src/scenex/model/_nodes/text.py	Introduces Text.antialias: bool.
src/scenex/model/_nodes/points.py	Changes Points.antialias to boolean with updated description.
src/scenex/model/_nodes/line.py	Changes Line.antialias to boolean.
src/scenex/adaptors/_vispy/_text.py	Adds _snx_set_antialias as a no-op (vispy text AA not tunable).
src/scenex/adaptors/_vispy/_points.py	Maps boolean AA to vispy Markers float (1.0/0.0).
src/scenex/adaptors/_vispy/_line.py	Passes and updates line AA as boolean.
src/scenex/adaptors/_pygfx/_text.py	Wires Text.antialias to TextMaterial.aa and updates setter.
src/scenex/adaptors/_pygfx/_points.py	Wires Points.antialias directly to material aa and updates setter.
src/scenex/adaptors/_pygfx/_line.py	Wires Line.antialias directly to material aa and updates setter.
src/scenex/adaptors/_base.py	Updates adaptor protocol signatures to boolean antialias where applicable.
examples/basic_points.py	Removes explicit backend selection in the example.
examples/basic_line.py	Fixes a comment (“mesh intersection” → “line intersection”).
examples/antialiasing.py	Adds a new AA toggle demonstration example.

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