[OpenLayers-Users] Vector points aver the dateline

[David Zwarg]

Hello Sylvain,

While not the most efficient, you can create 3 features for each item.  If
you are creating Point features, convert them to MultiPoint, LineString to
MultiLineString, and Polygon to MultiPolygon.

Place one set in the X coordinaties < -180, one set in the X coordinates >
-180 and < 180, and the last set in the X coordinates > 180.  Essentially,
triple the features used, and draw 3 'globes' worth of features.

You may see a flash when crossing the dateline, but your features won't
disappear when you cross the dateline (E to W, or W to E).

In practice, the extra features are not rendered because the renderer only
renders vector features that are visible in the viewport at any one time.

z

On Mon, Aug 30, 2010 at 10:06 AM, springrider <springrider at hotmail.com>
wrote:
>
> Good morning
>
> I am currently working in the pacific area from Indonesia to Polynesia and
> need to display pie charts based on population statistics.
> I followed this tutorial
>
http://thematicmapping.org/playground/openlayers_piecharts_geojson_google_chart.php
> and am really impressed by styling capabilities of OL.
>
> But (there is always a but), when i try to display my pies around the
> dateline, the display is getting problematic, both points on each side can
> not displayed at the same time and the map is always flashing when moving
> around the dateline.
> Moreover i had to convert  negative data into positive such as -160 to
200.
> Is there any workaround to display vector layers using OpenLayers in the
> Pacific area?
>
> Thanks in advance for your help, everything is working fine except this
last
> but essential aspect.
> I implemeneted the patch available here:
> http://trac.openlayers.org/ticket/2787 but didn't change anything.
>
> http://osgeo-org.1803224.n2.nabble.com/file/n5478314/OL.png
>
> Sylvain
>
> --
> View this message in context:
http://osgeo-org.1803224.n2.nabble.com/Vector-points-aver-the-dateline-tp5478314p5478314.html
> Sent from the OpenLayers Users mailing list archive at Nabble.com.
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/openlayers-users/attachments/20100830/2b635b2b/attachment.html