[OpenLayers-Dev] [Polygon Rendering] Inverse fill

[RICHARD Didier]

> Yeah, this issue has probably to do with the geometry clipping that is
> done for geometries that span over a long coordinate range, to avoid
> running out of coordinate space. A workaround would be to split your
> geometries into smaller ones, or use the Canvas renderer as Eric
> suggested.
>

We have already splitted the geometry (previously it was a big polygon
with a big hole ;-)
Seems it not enough ... sight !-(

btw, using the Canvas renderer won't work for IE, will it ?

didier

> Andreas.
>
> On Sat, May 19, 2012 at 4:03 PM, RICHARD Didier <didier.richard at ign.fr>
> wrote:
>>
>>> On Sat, May 19, 2012 at 1:08 PM, RICHARD Didier <didier.richard at ign.fr>
>>> wrote:
>>>> Hi devs,
>>>>
>>>> Based on the kml-layer.html with the following code :
>>>>
>>>> var map = new OpenLayers.Map({
>>>>    div: "map",
>>>>    layers: [
>>>>        new OpenLayers.Layer.WMS(
>>>>            "WMS", "http://vmap0.tiles.osgeo.org/wms/vmap0",
>>>>            {layers: "basic"}
>>>>        ),
>>>>        new OpenLayers.Layer.Vector("KML", {
>>>>            strategies: [new OpenLayers.Strategy.Fixed()],
>>>>            protocol: new OpenLayers.Protocol.HTTP({
>>>>                url: "polygon.kml",/****** the polygon ******/
>>>>                format: new OpenLayers.Format.KML({
>>>>                    extractStyles: true,
>>>>                    extractAttributes: true,
>>>>                    maxDepth: 2
>>>>                })
>>>>            })
>>>>        })
>>>>    ],
>>>>    numZoomLevels:19,/****** 19 levels to see the bug ******/
>>>>    center: new OpenLayers.LonLat(4.3560894576721,
>>>> 45.084481104508),/****** new center ******/
>>>>    zoom: 17
>>>> });
>>>>
>>>>
>>>> At this zoom, the symbology is correct : polygon's inside is filled
>>>> and
>>>> the outside is left blank.
>>>> When you zoom to level 18, the polygon's inside is not filled anymore
>>>> and
>>>> the outside is filled.
>>>>
>>>> Tested with OpenLayers 2.11, OpenLayers 2.12-rc4.
>>>>
>>>> The polygon is attached.
>>>>
>>>> I have browse the tickets on trac, but found nothing relevant.
>>>> Previously,
>>>> there was a hole in the polygon, but it has been removed.
>>>
>>> Nasty. Do you know an OpenLayers version with which your example
>>> works? Your example works correctly with the Canvas renderer
>>> (renderers: ['Canvas'] in the layer config), so this is probably a bug
>>> in the SVG renderer.
>>>
>>
>> 2.10, 2.9.1, 2.8, 2.7 : broken
>> 2.6 : when zooming in, the KML is not drawn ...
>> 2.5 : the browser's support for rendering is broken (despite :
>> renderes:['SVG'] added in the code)
>>
>> (tested under FF 12 / Linux)
>>
>> So, I guess it is an old issue with vector rendering ?!
>>
>> didier
>>
>>>
>>>
>>> --
>>> Eric Lemoine
>>>
>>> Camptocamp France SAS
>>> Savoie Technolac, BP 352
>>> 73377 Le Bourget du Lac, Cedex
>>>
>>> Tel : 00 33 4 79 44 44 96
>>> Mail : eric.lemoine at camptocamp.com
>>> http://www.camptocamp.com
>>>
>>
>>
>> --
>> RICHARD Didier - Chef du pôle technique du Géoportail
>> 2/4, avenue Pasteur - 94165 Saint Mandé Cedex
>> Tél : +33 (0) 1 43 98 83 23
>> _______________________________________________
>> Dev mailing list
>> Dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/openlayers-dev
>
>
>
> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
>


-- 
RICHARD Didier - Chef du pôle technique du Géoportail
2/4, avenue Pasteur - 94165 Saint Mandé Cedex
Tél : +33 (0) 1 43 98 83 23