I am looking for a basic geometry library with classes like Point, Line,
Rect, etc. And with operations like

Rect.new(Point, Point, Point, Point)

or

Line#angle

or

Line#rotate

or

Line#intersect(line)

and so on. Basic, abstract, dealing with points, lines, and other 2d
constructs. I know it's everyone's favorite oo example but is there a
well worked out, tested library so I don't have to write me another one?

Thanks!

Pitp
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