tile-grid

tile-grid is a library for map tile grid calculations.

Included standard grids are Web Mercator and WGS 84.

Usage

Predefined grids

```rust use tile_grid::{Extent, Grid};

let grid = Grid::wgs84(); asserteq!( grid.tileextent(0, 0, 0), Extent { minx: -180.0, miny: -90.0, maxx: 0.0, maxy: 90.0, } ); ```

Grid iterators

```rust use tile_grid::{Grid, GridIterator};

let grid = Grid::webmercator(); let tilelimits = grid.tilelimits(grid.extent.clone(), 0); let griditer = GridIterator::new(0, 2, tilelimits); for (z, x, y) in griditer { println!("Tile {}/{}/{}", z, x, y); } ```

Custom grids

```rust use tile_grid::{Extent, Grid, Unit, Origin};

let grid = Grid::new( 256, 256, Extent { minx: 2420000.0, miny: 1030000.0, maxx: 2900000.0, maxy: 1350000.0, }, 2056, Unit::Meters, vec![ 4000.0, 3750.0, 3500.0, 3250.0, 3000.0, 2750.0, 2500.0, 2250.0, 2000.0, 1750.0, 1500.0, 1250.0, 1000.0, 750.0, 650.0, 500.0, 250.0, 100.0, 50.0, 20.0, 10.0, 5.0, 2.5, 2.0, 1.5, 1.0, 0.5, ], Origin::TopLeft, ); asserteq!( grid.tileextent(0, 0, 15), Extent { minx: 2420000.0, miny: 1222000.0, maxx: 2548000.0, maxy: 1350000.0, } ); ```

Credits

• MapCache by Thomas Bonfort
• Mercantile by Sean C. Gillies

License

tile-grid is released under the MIT License.