parametric description of a bezier curve

[Paulo Abreu]

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Hi!

This is a continuation of my efforts to find an
easy and elegant way to place arrows in the middle
of a bezier curve.

I just realize that if I had a parametric description
of the bezier curve, giving the four control points,
then I could just do a
\parametricplot to the point where I want the arrow
to appear and then another \parametricplot all the way
to the end.

Anyone has the necessary math knowledge to find an
analitic or parametric description of a bezier curve
given its four control points?

TIA

Paulo


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