Hi, I have a data file with the coordinates (x,y) of a trajectory, which I would like to plot in the plane (x,y) (the phase plane). To make clear that the path is a trajectory, I want to stroke an arrowead at approximately half the arclength of the path (for those familiar with asymptote, I want to reproduce the effect of MidArrow. See, e.g., http://piprim.tuxfamily.org/asymptote/generale/index.html#fig0031) I wonder how to do that in PyX in a simple way.
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