Thanks Chris,

meanwhile I know how to calculate the pixel length of a polyline,
based on Pythagoras' theorem

http://www.wolfpil.de/v3/arrow-heads.html




On Jul 27, 1:03 pm, Chris Broadfoot <[email protected]> wrote:
> You could find the approximate length (in metres) of 10px at the desired
> latitude, and then chop that length off the polyline.
>
> --http://twitter.com/broady
>
> On Wed, Jul 13, 2011 at 10:06 PM, Pil <[email protected]> wrote:
> > Hmm, I see, that's no easy task, there is a lot of math necessary.
>
> > That's not worth the effort. Sorry for the noise.
>
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