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#[derive(PartialEq, Eq, Debug)]
pub struct Tile {
zoom: u8,
x: u32,
y: u32,
}
impl Tile {
pub fn new(zoom: u8, x: u32, y: u32) -> Option<Tile> {
if x < 2u32.pow(zoom as u32) && y < 2u32.pow(zoom as u32) {
Some(Tile { zoom: zoom, x: x, y: y })
} else {
None
}
}
fn parent(&self) -> Option<Tile> {
match self.zoom {
0 => {
None
},
_ => {
Tile::new(self.zoom-1, self.x/2, self.y/2)
}
}
}
fn subtiles(&self) -> Option<[Tile; 4]> {
match self.zoom {
std::u8::MAX => {
None
},
_ => {
let z = self.zoom+1;
let x = 2*self.x;
let y = 2*self.y;
Some([Tile{zoom:z, x:x, y:y}, Tile{zoom:z, x:x+1, y:y}, Tile{zoom:z, x:x, y:y+1}, Tile{zoom:z, x:x+1, y:y+1}])
}
}
}
fn centre_point(&self) -> LatLon {
let n: f32 = 2f32.powi(self.zoom as i32);
let lon_deg: f32 = (self.x as f32) / n * 360f32 - 180f32;
let lat_rad: f32 = ((1f32 - 2f32 * (self.y as f32) / n) * std::f32::consts::PI).sinh().atan();
let lat_deg: f32 = lat_rad * 180f32 * std::f32::consts::FRAC_1_PI;
LatLon::new(lat_deg, lon_deg).unwrap()
}
fn center_point(&self) -> LatLon {
self.centre_point()
}
pub fn tc_path<T: std::fmt::Display>(&self, ext: T) -> String {
let tc = xy_to_tc(self.x, self.y);
format!("{}/{}/{}/{}/{}/{}/{}.{}", self.zoom, tc[0], tc[1], tc[2], tc[3], tc[4], tc[5], ext)
}
}
#[derive(PartialEq, Debug)]
pub struct LatLon {
lat: f32,
lon: f32,
}
impl LatLon {
fn new(lat: f32, lon: f32) -> Option<LatLon> {
if lat <= 90f32 && lat >= -90f32 && lon <= 180f32 && lon >= -180f32 {
Some(LatLon{ lat: lat, lon: lon })
} else {
None
}
}
}
pub fn xy_to_tc(x: u32, y: u32) -> [String; 6] {
[
format!("{:03}", x/1_000_000),
format!("{:03}", (x / 1_000) % 1_000),
format!("{:03}", x % 1_000),
format!("{:03}", y/1_000_000),
format!("{:03}", (y / 1_000) % 1_000),
format!("{:03}", y % 1_000),
]
}
pub fn zxy_to_tc_path(z: u8, x: u32, y: u32, ext: &str) -> String {
let tc = xy_to_tc(x, y);
format!("{}/{}/{}/{}/{}/{}/{}.{}", z, tc[0], tc[1], tc[2], tc[3], tc[4], tc[5], ext)
}
pub fn xy_to_mp(x: u32, y: u32) -> [String; 4] {
[
format!("{:04}", x/10_000),
format!("{:04}", x % 10_000),
format!("{:04}", y/10_000),
format!("{:04}", y % 10_000),
]
}
pub fn zxy_to_mp_path(z: u8, x: u32, y: u32, ext: &str) -> String {
let mp = xy_to_mp(x, y);
format!("{}/{}/{}/{}/{}.{}", z, mp[0], mp[1], mp[2], mp[3], ext)
}
mod test {
use super::*;
#[test]
fn tc() {
let res = xy_to_tc(3, 4);
assert_eq!(res[0], "000");
assert_eq!(res[1], "000");
assert_eq!(res[2], "003");
assert_eq!(res[3], "000");
assert_eq!(res[4], "000");
assert_eq!(res[5], "004");
assert_eq!(zxy_to_tc_path(2, 3, 4, "png"), "2/000/000/003/000/000/004.png".to_string());
}
#[test]
fn mp() {
let res = xy_to_mp(3, 4);
assert_eq!(res[0], "0000");
assert_eq!(res[1], "0003");
assert_eq!(res[2], "0000");
assert_eq!(res[3], "0004");
assert_eq!(zxy_to_mp_path(2, 3, 4, "png"), "2/0000/0003/0000/0004.png".to_string());
}
#[test]
fn tiles() {
let tile = Tile::new(1, 5, 5);
assert_eq!(tile.is_none(), true);
assert_eq!(Tile::new(4, 8, 9).is_some(), true);
let tile = Tile::new(1, 0, 0);
assert_eq!(tile.is_none(), false);
let tile = tile.unwrap();
let parent = tile.parent();
assert_eq!(parent.is_none(), false);
let parent = parent.unwrap();
assert_eq!(parent, Tile::new(0, 0, 0).unwrap());
assert_eq!(parent.centre_point(), LatLon::new(0f32, 0f32).unwrap());
assert_eq!(parent.tc_path("png"), "0/000/000/000/000/000/000.png");
let children = parent.subtiles();
assert_eq!(children.is_none(), false);
let children: [Tile; 4] = children.unwrap();
assert_eq!(children[0], Tile::new(1, 0, 0).unwrap());
assert_eq!(children[0].tc_path("png"), "1/000/000/000/000/000/000.png");
assert_eq!(children[1], Tile::new(1, 1, 0).unwrap());
assert_eq!(children[1].tc_path("png"), "1/000/000/001/000/000/000.png");
assert_eq!(children[2], Tile::new(1, 0, 1).unwrap());
assert_eq!(children[2].tc_path("png"), "1/000/000/000/000/000/001.png");
assert_eq!(children[3], Tile::new(1, 1, 1).unwrap());
assert_eq!(children[3].tc_path("png"), "1/000/000/001/000/000/001.png");
}
}