I too am interested in this functionality for my custom maps. I would love to build a custom projection for my custom maps that is just 1:1, but I could live with the LatLng system. My only problem with that system is that, using the mercator projection, the world wraps and I need to find a way for my polygons, polylines, markers and infoboxes to not appear in empty space when zoomed out. I'm assuming that a 1:1 could be a solution to this, but all I can do is guess at this point.
I tried fiddling with your example code using it as a basis and I couldn't get it into a state that Google Maps could make any sense of. Without any documentation on how the projections are supposed to be formulated I'm sort of at a loss. Alternatively, can you think of any way to simply disable tiling and subsequently drawing the overlays outside of the "home tile" (tile 0,0 at zoom level 0)?. I also have a "Center Map" Control button that is supposed to center the map, but it's expecting a wrapping world too and will center on a non-existent adjacent tile if the map is scooted too far left or right. evilC: Did you ever get your projection to work? How is your map system coming along? On Jan 25, 6:08 pm, Ben Appleton <[email protected]> wrote: > On Tue, Jan 26, 2010 at 9:15 AM, evilC <[email protected]> wrote: > > I have a reasonable amount of experience with the Google Maps API, but > > none so far with custom map types and I have been asked to help to > > make a map of an online game world (http://navemap.com). > > > Now from my research, it seems that the smart move would be to > > properly integrate the game's coordinate system into the map so that > > things are all accurate. AFAIK, the game world is in effect flat. I am > > not yet sure on wrapping, there may be e/w wrapping (So it may in > > effect be a cylinder). I think the origin is in the centre of the map, > > with negative values for west and north of the origin. > > OK. The Maps API uses latitude/longitude coordinates, which are > cylindrical. That is, there is e/w wrapping but no n/s wrapping. If your > game coordinates do not wrap e/w, then you can either: > 1 - Avoid the +/- 180 longitude line by placing your game map from -90 to > +90 longitude. No-one is likely to pan so far offscreen that they notice > the world wraps. > 2 - Or, listen for Map event "center_changed" and if the map pans outside > -90 to +90 longitude just setCenter() to the nearest point back inside these > bounds. > > So from reading the API documentation, it seems to me that I do not > > > want to use a projection? Or if the map insists on one, a plain 1:1 > > conversion from world coordinates to map coordinates? > > Yes, a plain 1:1 conversion would do. So I suggest using > ImageMapType<http://code.google.com/apis/maps/documentation/v3/reference.html#Imag...> > to > download your map tiles, and attach a .projection object like: > > var myMapType = new ImageMapType(...); > > var myProjection = {}; > myProjection.fromLatLngToPoint = function(latLng) { > return new Point(latLng.lng(), latLng.lat());}; > > myProjection.fromPointToLatLng = function(point) { > return new LatLng(point.y, point.x); > > }; > > // Set the projection for custom map type: > myMapType.projection = new MyProjection; > > Now this is a bit oversimplified: you'll have to tweak the projection so > that eg. markers are placed in the right positions on your tiles, otherwise > all your overlays will be misaligned. > > > > > Either that, or will it work properly if I just map game world > > coordinates to lat and lng? I am worried about the effects of the > > mercator projection on a world which is not spherical. > > > Please advise. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google Maps JavaScript API v3" group. > > To post to this group, send email to > > [email protected]. > > To unsubscribe from this group, send email to > > [email protected]<google-maps-js-api-v3%2b[email protected]> > > . > > For more options, visit this group at > >http://groups.google.com/group/google-maps-js-api-v3?hl=en. -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
