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Polymaps is a fancy JavaScript mapping library.

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README.mkd

CAVEATS, FEATURE REQUESTS AND KNOWN BUGS

API:

  • 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?

Events:

  • "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.

Sizing:

  • 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.

Tiles:

  • 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.

Queue:

  • Should prioritize tile requests from the center out.
  • Create host-specific queues to allow more than 6 simultaneous requests?
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