Hi, I have created a ticket at: http://trac.openlayers.org/ticket/2600. I hope I did it correctly, as it was my first ticket :)
However, I still have a problem with ScaleLine on WGS84-based map. Below I attach a complete html file with a map. In this example when I zoom in to Europe and pan from N to S the ScaleLine does not change. Unless I move to the pole, but this was discussed earlier and a ticket for this has been created. My questions are also: 1. What do you think about updating OpenLayers.INCHES_PER_UNIT instead of calculating N-S or W-E geodesic distances for calibrating the scale line control. 2. If you apply a patch that changes the scale line control to do a West-East measurement instead what will happen if you drag your map beyond -180/180 longitudes? 3. Do you have any idea whether MapFish will also adopt geodesic scale bar functionality? Regards, Jan <html xmlns="http://www.w3.org/1999/xhtml";> <head> <title>ScaleBar Problem</title> <script src="http://openlayers.org/api/OpenLayers.js";></script> <script type="text/javascript"> var map, scalebar; function init(){ map = new OpenLayers.Map('map'); var layer = new OpenLayers.Layer.WMS( "OpenLayers WMS", "http://labs.metacarta.com/wms/vmap0";, {layers: 'basic'} ); map.addLayer(layer); map.setCenter(new OpenLayers.LonLat(0,0), 2); map.addControl(new OpenLayers.Control.MousePosition()); map.addControl(new OpenLayers.Control.ScaleLine({geodesic: true})) } </script> </head> <body onload="init()"> <div style="width:600; height:400" id="map"></div> </body> </html> Jan Burdziej 2010/4/28 Andreas Hocevar <ahoce...@opengeo.org> > > On Apr 28, 2010, at 16:46 , Jan wrote: > > > Strange. Now it works, but only with OSM layer (which is in Spherical > Mercator) and it does not work when I use WGS-based layer (e.g. " > http://labs.metacarta.com/wms/vmap0";) - in this case scaleline changes > between 1000 and 10000 km when I drag a map towards poles. > > The ScaleLine control uses a line in North-South direction to calculate the > scale distance. If you are at the poles, there will be one coordinate that > goes beyond the pole. Hence the measurement problem. Can you please create a > ticket, I have a patch that changes the scale line control to do a West-East > measurement instead. > > Regards, > Andreas. > > > > > Regards, > > Jan Burdziej > > > > > > 2010/4/28 Bart van den Eijnden <bart...@osgis.nl> > > Add your control after the call to zoomToMaxExtent. > > > > Best regards, > > Bart > > > > On Apr 28, 2010, at 2:34 PM, Jan wrote: > > > >> var map, scalebar; > >> > >> function init(){ > >> > >> map = new OpenLayers.Map('map'); > >> var layer = new OpenLayers.Layer.WMS( > >> > >> "OpenLayers WMS", > >> > >> "http://labs.metacarta.com/wms/vmap0";, > >> {layers: 'basic'} > >> > >> ); > >> > >> > >> map.addLayer(layer); > >> > >> > >> var scalebar = new OpenLayers.Control.ScaleLine({ > >> geodesic: true > >> }); > >> > >> map.addControl(scalebar); > >> > >> map.zoomToMaxExtent(); > >> > >> > >> } > >> > > > > > > _______________________________________________ > > Users mailing list > > Users@openlayers.org > > http://openlayers.org/mailman/listinfo/users > > -- > Andreas Hocevar > OpenGeo - http://opengeo.org/ > Expert service straight from the developers. > >
_______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users
