Network.OSM

Types

data TileID

Instances

Eq TileID

Ord TileID

Show TileID

data TileCoords

The coordinates associated with any particular GPS location can be computed using determineTileCoords and converted into tile ids using selectedTiles before final download with downloadTiles.

Constructors

TileCoords

Fields

minX :: Int

maxX :: Int

minY :: Int

maxY :: Int

High Level Operations

downloadBestFitTiles :: String -> (Lat a, Lon a) => [a] -> IO [[ByteString]]

Takes the destination directory for the web content, the (Trail PtType), and uses the DrawOsm functions to generate an `osm.png' file showing the trail.

osmTileURL :: String

The official OSM tile server.

pixelPosForCoord :: (Lon a, Lat a, Integral t) => [a] -> TileCoords -> Int -> (t, t)

Takes a WptType, the OSM tile boundaries, and a zoom level then generates (x,y) points to be placed on the Image.

Low level and helper functions

determineTileCoords :: (Lat a, Lon a) => [a] -> Int -> Maybe TileCoords

Computes the rectangular map region to download based on GPS points and a zoom level

selectedTiles :: TileCoords -> [[TileID]]

Takes the boundaries of the OSM tiles, and generates a list of the encompassed OSM tiles.

downloadTiles :: String -> [[TileID]] -> Int -> IO [[ByteString]]

Takes the boundaries of the OSM tiles and downloads the tiles, keeping them in proper grid patterns for latter stiching or side-by-side display.

Legal

copyrightText :: String

The suggested copyright text in accordance with http:wiki.openstreetmap.orgwikiLegal_FAQ