Moin, 2009/4/25 Jeffrey Warren <war...@mit.edu>: > I'm working on a Javascript map renderer, non tile-based. It's really > early-stage alpha, and not publicly released yet, but I'd love some feedback > from folks as I'm continuing to develop it.
Sorry for not replying directly or earlier, I wasn't subscribed to this list until 5 minutes ago :) Initially I didn't want to spread my project to far, as it was (and is) still quite beta. However, now that so many people start pursing the same idea... ;) Jeffrey, you wrote: > It's not been optimized yet, so loading is a little slow, but I'm optimistic > that it will scale. Based on my experience, I can tell you right away it won't scale :) Not to discourage you, but: * the amount of data is really huge. Throwing a few dozend megabyte XML or even JSON at the browser will bring it to its knees. Not to mention the data you need to render even a small city. * re-rendering everything takes a long time. You want to avoid that :) My app has already quite a few optimizations, and it still chokes at big cities like Berlin or London. However, I am confident that things can be improved :) (Browser limitations non-withstanding. Single-threaded dead-slow JS and incomplete Canvas spec without dashe I hate thee... :( Regarding the rule sets and CSS: I've already considered adding a different rule-set (just to show that it can be done). However, from a technical viewpoint, that is not that spectacular. As long as the renderer is flexible enough to handle the wanted features, it doesn't really matter in what format the rules are (CSS, GSS, JSON, XML, you name it) or where they come from (hard-coded, web, URI, user input), as long as you can load, parse and convert them, it can display them. In my eyes the much bigger impact is that you no longer need different sets of tiles or tile providers - just the data and the rules to display it and the map can morph in real-time from mapnik to cyclemap to whatever-you-want. And one more button click and the user can save it locally. That's at least my vision I work towards :) All the best, Tels _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
