[cairo] Algorithm help please!

[Donn]

Gerdus,
I see that the total distance of the path is quite important. I am not much 
good at math, but I can't see how adding the x and y (along the path list) 
together can give the total distance. It seems it should be more of a triggy 
kind of Pythagoras affair. I will hit google with 'length path algorithm' in 
a mo.

\d
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