Hi,

I want to create a compass from a polyline, which shows a certain
bearing on the map, i.e. 126 degrees.

My original approach was to try and determine pixel positions on the
maps DIV, translate them into coordinates, and display accordingly.
But that failed kind of spectacularly from not understanding how the
Projections really work.
I got it working using coordinates for calculation, but it's kind of a
problem to determine the ideal compass needle length in degrees, so
I'm still eyeing this pixel conversion.
I guess my major problem was to understand, how the world coordinates
handed back from the Projection functions relate to on-screen-pixels,
and how to convert to and from them. I read all the tutorial about it,
but it didnt really make too much sense to me. Anyone got a
recommendation on a page to use for reading up about this, or some
very down-to-earth demo code lines explained in plain language?

Thanks,
Marco

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