Finding where an annotation line ends


?I'm using an annotation for a plot in this way:

ax.annotate("", xy=(x1,y1), xycoords='data',
??? xytext=(x2,y2), textcoords='data',
??? arrowprops=dict(arrowstyle='-', patchB=None,
??? shrinkA=25),)

Because I'm setting shrinkA to 25 pixels the line doesn't exactly end at
(x2,y2). Is there an easy way to find out the end point of the line in
axis coordinates?
An unrelated question, Is there an easy way to use a stump (a circle) as

Many thanks,

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