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Our intent is to provide a minimal, extensible, customizable, and free display library for discriminating designers and developers who want to use interactive maps in their own projects. Polymaps provides a core set of features in a tight, clean package, with plenty of hooks for additional functionality.
CAVEATS, FEATURE REQUESTS AND KNOWN BUGS
- Tested in recent Webkit browsers (Safari 4+, Chrome 6, Webkit nightlies)
- Tested in recent Firefox browsers (3.6+)
- Optimistic about Opera, IE9, but not part of core testing yet.
- SVG is required, even for image display...
- in other words: if you can't require SVG, don't use Polymaps!
- Vector overlays in GeoJSON format are supported, both tiled and single file
- Image layers in Google-y spherical mercator format are supported
- There are no default markers or infobubbles (yet?)
- No defensive copying (on input or output).
- No type coercion (e.g., String -> Number for zoom).
- Using == instead of ===.
- Many properties cannot be changed after load (e.g., tile size, URL).
- No (easy) way to lookup a GeoJSON elements by feature id.
- Missing in-code documentation, API reference.
- Include support (not just examples) for TileCache, TileStache, Bing?
- "move" event does not distinguish zoom / pan / zoom+pan events.
- "show" events are not supported on image tiles.
- There are no corresponding "unload" or "hide" events.
- There is no "error" event if a tile fails to load.
- Arrow control pans three times for two keydowns.
- Maps with no explicit size are auto-resized on window resize;
- This may miss resize based on DOM changes (e.g., element removal).
- This may generate spurious resize events for fixed-size parents.
- If the map is bigger than its parent, tiles are not automatically clipped.
- Assumes Mercator projection, with Google-y transform.
- Anti-aliasing artifacts are visible with smooth zooming / rescaled tiles.
- When translucent tiles are rescaled, they can overlap with other resolutions.
- Should prioritize tile requests from the center out.
- Create host-specific queues to allow more than 6 simultaneous requests?