After doing more work with this after my post, I need to clarify what the issue is.
The demo you refer to is the type of behavior I am after. I have written some custom code to render the polygon segments ( the line between each vertice of the polygon ) as great circle segments vs straight line segments. The way that I do this is intercept the path in the drawPolygon methods of the SVG and VML renderer classes and then compute and insert points into that path to define the great circle geometry. This code works perfect in Mozilla, I can zoom, reposition the map, etc. and the great circle segments render correctly. Under IE, if I do not reposition the map, the great circle paths show correctly. If I move the map, the great circle points appear to be offset exactly opposite in the same amount that the map layer was moved. My thought is that this is due to the way VML shows points vs SVG ( differing coord systems ?) As I am changing core functionality of the way things work I realize this is an error in my code, I just am not really sure in which part of the code I should look for the answer. Any pointers on the differences between how VML calculates shows points and SVG would be appreciated. The high level design is to intercept the path in draw polygon, get the LonLat object for each pixel by using map.getLonLatFromPixel method, pass that to my code which computes the great circle path between the LonLats, return an array of LonLat objects , then convert those back to pixels using map.getPixelFromLonLat() method. I then rebuild the path string and return it back to the drawPolygon method. It seems that I am getting incorrect results in the case of IE from the getPixelFromLonLat() method. Would a different method be the correct solution ? Or am I suffering from a core misunderstanding of what OpenLayers is doing? Thanks again for any guidance. On Wed, Dec 1, 2010 at 1:10 AM, Andreas Hocevar-2 [via OSGeo.org] < [email protected]<ml-node%[email protected]> > wrote: > Hi, > > I am not sure what you mean by "reposition the WMS base layer", but looking > at http://openlayers.org/dev/examples/draw-feature.html, which seems to be > similar to your application, I don't encounter any problems in IE. > > Andreas. > > On Nov 30, 2010, at 23:53 , cmeyer001 wrote: > > > > > Hello, > > > > I am relatively new to OpenLayers and am encountering some strange > behavior. > > > > I have 2 Layers, a WMS base layer and a vector layer overlayed so that I > can > > draw polygons on the map. > > > > In Mozilla when I reposition the WMS base layer the vector layer seems to > > > reposition in that I cant draw outside the extent of the WMS base layer ( > > > this is the behavior I desire ). > > > > In IE, on the initial load, things work great, the vector layer draws the > > > polygons exactly where they should be drawn, however if I move the WMS > base > > layer it appears that the Vector layer moves the same distance but in the > > > exact opposite direction. When I then attempt to draw the polygon shapes > > they appear outside the extent of the WMS map. > > > > Based on the fact that it works as one would anticipate in Mozilla, > however > > it behaves differently in IE, I am inclined to call this a bug. > > > > Has anyone experienced similar behavior and has anyone figured a > > work-around? > > > > I searched through the issue tracker and was not able to find an issue > like > > this. > > > > Thanks for any assistance. > > > > Regards > > > > Colby > > -- > > View this message in context: > http://osgeo-org.1803224.n2.nabble.com/Strange-behavior-in-IE-vs-Mozilla-with-Vector-Layer-and-WMS-layer-tp5789952p5789952.html<http://osgeo-org.1803224.n2.nabble.com/Strange-behavior-in-IE-vs-Mozilla-with-Vector-Layer-and-WMS-layer-tp5789952p5789952.html?by-user=t> > > Sent from the OpenLayers Users mailing list archive at Nabble.com. > > _______________________________________________ > > Users mailing list > > [hidden email] <http://user/SendEmail.jtp?type=node&node=5790953&i=0> > > http://lists.osgeo.org/mailman/listinfo/openlayers-users > > > > -- > Andreas Hocevar > OpenGeo - http://opengeo.org/ > Expert service straight from the developers. > > _______________________________________________ > Users mailing list > [hidden email] <http://user/SendEmail.jtp?type=node&node=5790953&i=1> > http://lists.osgeo.org/mailman/listinfo/openlayers-users > > > ------------------------------ > View message @ > http://osgeo-org.1803224.n2.nabble.com/Strange-behavior-in-IE-vs-Mozilla-with-Vector-Layer-and-WMS-layer-tp5789952p5790953.html > To unsubscribe from Strange behavior in IE vs Mozilla with Vector Layer and > WMS layer, click > here<http://osgeo-org.1803224.n2.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=5789952&code=Y29sYnkuYy5tZXllckBnbWFpbC5jb218NTc4OTk1MnwyMDgxNzU5NjE1>. > > -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/Strange-behavior-in-IE-vs-Mozilla-with-Vector-Layer-and-WMS-layer-tp5789952p5792125.html Sent from the OpenLayers Users mailing list archive at Nabble.com.
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