On Dec 18, 3:55 pm, Alexandre Dube <[email protected]> wrote:
>
> [A] == trails
> [B] == trail conditions (i.e. snowy)
>
> Both line data come from different databases, they are not the same (so
> I can't just change the color of [A] trails, I really need to add larger
> [B] trails to emulate an "highlight" over the [A] trails)
>
> When zooming, [A] features get destroyed and replaced by other ones
> (simplified) and are rendered on top of [B] trail conditions lines...
>
> It could be simple to remove/add [B] again after [A] redrawn as Marcelo
> proposed, but I wonder if there is a better way to do so ?


If you have a wide line showing the trail [A], and a narrow line
indicating the conditions [B] on top of it (so it shows as a stripe
down the middle of the trail), would it be acceptable to use an
encoded polyline for A so it didn't have to be removed on a zoom? The
level of detail shown is automatically controlled, and you just need
to redraw B. Leaving A on the map and re-drawing B on top should
achieve the result you want.

On the other hand, Marcelo's solution is nice and simple.

Andrew

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