Hi, You can only interact with vector features, not just plain images. The layer you're referring to ( country boundaries ) is a WMS layer so it returns an image only.
If the server that renders that image is also configured to return geometry ( like a WFS server for example ) then you could have a vector layer of country boundaries and interact with it. One major problem with this that the polygon features returned would contain a lot of geometry and take a lot of time to display. Browsing your map would be slow too. A common practice is to have a WMS layer on top zoom levels and have your vector features displayed on lower levels. See the following example showing what I mean (zoom in/out the map) : http://dev4.mapgears.com/bdga/bdgaWFS-T.html If you have your own data to play with, I would suggest you to read the following articles to create your own WFS server and play with your own data : http://mapserver.org/ogc/wfs_server.html Best of luck with your learning and welcome to the community, Alexandre new2ms4w wrote: > Hi, > > I used MapServer with OpenLayers to display the road map of a country. Now, > I want to select a particular and add a moving object to it. > > Adding a moving object to the map is easy. ( I drew a point on the map and > I'm just moving it by calling OpenLayers.Geometry.move() ) > However I want these points to move only on roads. > > So, first I need to select a road and then add the moving object. This is > the hard part for me. > > The examples section has an example (OpenLayers Select Feature Example > http://www.openlayers.org/dev/examples/select-feature.html ) showing how to > select a point, line or polygon (or any vector feature) which I draw there > by either drawing a box or moving mouse over the feature etc. > > But how do we select a feature from the base layer? (Does the base layer > even have features at all?) > By this what I mean is how do we select the country boundaries in the above > webpage. > > Thank you for your time. I'm a student just started using OpenLayers around > 1 week back. So, please bear with my questions. > > ~PN > -- Alexandre Dubé Mapgears www.mapgears.com _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
