I want to calculate the intersection of the edge of a marker with a line

running from the center to another marker. I want to do this in order to

decorate the intersection.

I'm using the following code(derived from some code in axes.py) to try

and "divine" the size:

node_sz=sqrt(size*(ax.figure.dpi.get()/72.0))

This is not right. Clearly, I just don't have an idea what I'm doing

(when it comes to calculating the distance along a vector(the along a

vector part is easy) of the size of scatter marker). Anyway, who can

point me in the right direction would be my hero for atleast 2 or 3

hours.

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Matt