add coordinates for Rect1

[thchr]

I have wanted to use the Rect class here occasionally in some more generic contexts, and the absence of a coordinates method for the 1D case has then been a bit annoying: this just proposes adding it (and adds texturecoordinates alongside).

There is of course more that could be done for fleshing out the Rect{1} methods - and for Rect{N} interfaces more broadly, but my ambition is limited to just this.

[Copilot]

Pull request overview

Adds missing coordinates/texturecoordinates decomposition support for 1D rectangles (Rect{1}) so they can be used more uniformly with the rest of the geometry interfaces.

Changes:

• Add coordinates(::Rect{1,T}) returning the 2 endpoints of the interval.
• Add texturecoordinates(::Rect{1}) for 1D rects.
• Add unit tests covering Rect{1} coordinate/texturecoordinate behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/primitives/rectangles.jl	Implements coordinates and texturecoordinates for Rect{1}.
test/geometrytypes.jl	Adds assertions for Rect{1} decomposition outputs.

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[ffreyer]

I'm not sure if it makes sense to define texturecoordinates because I don't think they make much sense outside a mesh and generating a mesh from a 1D Rect seems odd to me. If you do add them they should be using floats not ints because they are usually interpolated between vertices to sample another resource (texture).

[thchr]

Makes sense: removed now.