On Thu, Oct 16, 2008 at 3:07 AM, Jochen Topf <[EMAIL PROTECTED]> wrote: > On Thu, Oct 16, 2008 at 03:49:11AM +1200, Joseph Gentle wrote: >> On Thu, Oct 16, 2008 at 3:18 AM, Andy Allan <[EMAIL PROTECTED]> wrote: >> > 'Better' is dependent on what you're trying to achieve, but there are >> > certainly many 'different' representations in use in different >> > projects. >> >> I want to represent the data such that a user can pan and zoom a map >> around smoothly (25+ fps) without pre-rendering tile images. >> Especially on devices like the iphone, that would be really nice. >> >> The only data structure I can think of to do something like this would >> be a quad tree with internal nodes containing data at particular >> detail levels. (So that for a fixed size view you never have to >> inspect more than a fixed number of quad tree nodes). >> >> Basically, it would look the same as the current tile set; but >> prerendered tile images would be replaced with node&way lists listing >> the data the corresponding tile shows. >> >> Has anyone written a program like this; either with that sort of data >> format or solving that problem? > > Have a look at "navit". Although 25+ fps is somewhat optimistic for a > mobile device... (http://wiki.openstreetmap.org/index.php/Navit) > > I use postgis for live rendering of OSM data and generally it is very fast. > But OSM has huge amounts of data and you'll have to make compromises > somewhere. > > Jochen
Thanks guys! I think 25fps is ambitious but possible on devices such as the iphone which have hardware accelerated graphics capability. -J _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
