[OpenLayers-Dev] Patrch for getting vector drawing working over the 180 line going.

[Phil Scadden]

> The place where dateline handling should be solved for vector features is in the vector renderers, probably in Renderer.drawFeature. There you should check if the currently visible extent crosses the date line, and process x coordinates of the geometries that are about to be drawn - just like you do now in the handlers.
>    

Okay, I have looked further into this.

At some point, the geometry has to be adjusted so it draws properly. The 
world coordinates arent converted to screen coordinate until down into 
the SVG layer. It would seem that this is an inappropriate place to deal 
with the 180 because it is renderer dependent.

Better would seem to be in drawGeometry in Elements.js because then can 
fix once for a range of different geometries. A side effect would be 
that adjusted geometry is being fed to the indexer, what that does.
Slightly further up would be in drawFeature of Renderer.js. One 
possibility here would be that if geometry needs adjustment, then we can 
clone features.geometry, adjust the clone and pass that to drawGeometry
leaving the original geometry untouched. I am not sure that is as 
efficient as fixing the geometry just first time it is rendered.

For the moment, I am looking at fiddling the 180 in drawFeature and 
hoping that doesnt impact the indexer.

-- 
Phil Scadden, Senior Scientist GNS Science Ltd 764 Cumberland St, 
Private Bag 1930, Dunedin, New Zealand Ph +64 3 4799663, fax +64 3 477 5232

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