It took me longer than I'd like to figure out how to (cleanly) roll a hyperbola on a straight line, but it worked out. I should try writing up the math behind this later...
@tpfto The blue dot is one focus, and the red dot is the midpoint between the foci?
@jsiehler correct, the blue dot is one focus of the rolling hyperbola, and the red dot is the center of that same hyperbola.
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