Pretty straightforward: uses the feature of line() that it will draw from the end of the previous line to connect the dots around a curve defined parametrically (i.e. x,y both written as functions of t). Uses whatever the current pen color set by color() is.
Tried to build in some basic politeness features - it resets the draw state when it's done, it sets the sign on deltat to make sure that it points from t0 towards t1, it chooses a default value if deltat is given as 0 or not given, and it will always draw a line that starts at t0 and ends at t1 whether or not deltat is an integer factor of (t1-t0). With all of those implemented, it works out to 82 tokens; cutting all of those out drops it to 33 tokens. Haven't given this a bulletproof QA treatment but it passed some basic checks.
Demo uses the parametric representation of the standard ellipse off Wikipedia.
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