Christopher Schmidt wrote: > On Thu, Dec 17, 2009 at 02:39:41PM -0800, Alexei Peters wrote: >> Hi Everyone, >> I currently work for a small GIS consulting firm and one of the projects >> we're currently working on has a potential requirement for rotating the map >> (so north doesn't point up, but rather to the right for example). >> >> Has anyone any idea of how to do this, or has done this? My company would >> be even willing to fund this effort if need be. >> >> I'd love to hear anyone's thoughts on this. > > 1. In Javascript/Images/DOM (ignoring Canvas for the moment), there is > no way to make an image exist on an angle. > 2. Canvas has some support for this, I believe, but is limited in where > you can use it. > > Generally speaking, what you would do to solve this problem would be to > pre-rotate your map (in a tool like photoshop, or something equally non > OpenLayers related), and then work with at that point. Some people on > the list have had some experience with that way of using OpenLayers; a > key aspect of this would be to write a translation from your map coordinates > (which will likely be in pixels after the rotation) to geogrpahic coordinates, > but that's not too hard, in general. > > Best Regards,
If you are using mapserver I believe there has been some work that would allow the image to draw with north rotated say to the east. Look for the ANGLE parameter in the MAP object. -Steve W _______________________________________________ Dev mailing list Dev@openlayers.org http://openlayers.org/mailman/listinfo/dev
