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#[derive(Debug, Clone)]
pub struct Region {
pub name: String,
pub regiontype: RegionType,
pub boundary: Vec<[f64; 2]>,
pub areakm2: f64,
}
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum RegionType {
Continent,
Ocean,
Sea,
Country,
Island,
}
pub struct RegionDatabase {
pub regions: Vec<Region>,
}
impl RegionDatabase {
pub fn continents() -> Self {
Self {
regions: vec![
Region {
name: "Africa".into(),
regiontype: RegionType::Continent,
boundary: vec![
[35.8, -5.6],
[37.1, 10.5],
[33.0, 12.0],
[31.5, 25.1],
[31.5, 32.3],
[22.0, 36.5],
[12.5, 43.3],
[11.6, 51.0],
[-1.7, 41.9],
[-11.7, 40.4],
[-25.5, 35.0],
[-34.8, 20.0],
[-34.5, 18.5],
[-29.0, 16.5],
[-17.0, 11.7],
[-6.0, 12.3],
[4.0, 2.5],
[5.0, -3.5],
[4.7, -7.5],
[7.5, -13.0],
[12.0, -16.7],
[14.7, -17.5],
[21.4, -17.1],
[27.7, -13.1],
[35.8, -5.6],
],
areakm2: 30370000.0,
},
Region {
name: "Antarctica".into(),
regiontype: RegionType::Continent,
boundary: vec![
[-65.0, -60.0],
[-68.0, -62.0],
[-72.0, -74.0],
[-72.5, -100.0],
[-71.5, -120.0],
[-73.0, -145.0],
[-71.0, -170.0],
[-77.0, 170.0],
[-72.0, 155.0],
[-67.0, 143.0],
[-66.5, 110.0],
[-69.0, 76.0],
[-69.5, 40.0],
[-70.0, 2.0],
[-71.0, -23.0],
[-65.0, -60.0],
],
areakm2: 14200000.0,
},
Region {
name: "Asia".into(),
regiontype: RegionType::Continent,
boundary: vec![
[41.0, 28.8],
[42.0, 44.0],
[39.8, 53.4],
[37.4, 61.6],
[29.3, 66.4],
[23.7, 68.4],
[7.0, 80.2],
[1.3, 103.5],
[6.0, 106.6],
[18.0, 108.5],
[22.2, 114.2],
[32.0, 121.5],
[39.9, 124.4],
[43.0, 131.5],
[53.5, 141.0],
[59.0, 163.0],
[66.0, 170.0],
[71.0, -180.0],
[71.0, 180.0],
[69.0, 65.0],
[55.3, 28.0],
[44.4, 26.0],
[41.0, 28.8],
],
areakm2: 44580000.0,
},
Region {
name: "Europe".into(),
regiontype: RegionType::Continent,
boundary: vec![
[36.0, -9.5],
[43.0, -9.3],
[47.5, -5.5],
[48.8, 2.3],
[51.5, -0.1],
[58.0, 5.3],
[64.0, 11.0],
[70.0, 26.0],
[69.0, 33.0],
[67.0, 41.0],
[55.7, 37.6],
[55.3, 28.0],
[44.4, 26.0],
[41.0, 28.8],
[39.6, 22.7],
[37.0, 15.0],
[36.0, -9.5],
],
areakm2: 10180000.0,
},
Region {
name: "North America".into(),
regiontype: RegionType::Continent,
boundary: vec![
[71.0, -156.0],
[71.0, -95.0],
[63.0, -69.0],
[52.5, -55.7],
[47.0, -60.0],
[44.6, -66.9],
[30.0, -81.5],
[25.0, -80.0],
[18.5, -88.0],
[15.0, -84.0],
[8.0, -77.0],
[9.0, -79.5],
[14.5, -92.0],
[19.4, -99.1],
[22.9, -109.9],
[32.5, -117.1],
[48.5, -125.0],
[55.0, -133.0],
[60.0, -141.0],
[64.0, -166.0],
[71.0, -156.0],
],
areakm2: 24710000.0,
},
Region {
name: "South America".into(),
regiontype: RegionType::Continent,
boundary: vec![
[12.5, -72.0],
[10.5, -61.9],
[6.8, -58.2],
[2.8, -51.0],
[-2.5, -44.3],
[-8.0, -34.9],
[-15.0, -39.0],
[-22.9, -43.2],
[-33.7, -53.4],
[-41.0, -65.0],
[-46.0, -67.5],
[-52.3, -70.0],
[-55.0, -68.0],
[-54.8, -65.0],
[-47.0, -75.5],
[-40.0, -73.5],
[-33.5, -71.6],
[-18.5, -70.4],
[-5.0, -81.0],
[1.0, -79.5],
[8.0, -77.0],
[12.5, -72.0],
],
areakm2: 17840000.0,
},
Region {
name: "Oceania".into(),
regiontype: RegionType::Continent,
boundary: vec![
[-11.0, 131.0],
[-10.7, 142.0],
[-16.0, 145.7],
[-23.5, 150.0],
[-28.2, 153.5],
[-37.8, 150.0],
[-38.5, 146.0],
[-35.0, 136.0],
[-32.0, 133.5],
[-31.5, 131.0],
[-34.7, 116.0],
[-22.0, 114.0],
[-13.8, 126.8],
[-11.0, 131.0],
],
areakm2: 8526000.0,
},
],
}
}
pub fn pointinregion(&self, lat: f64, lon: f64) -> Option<&Region> {
self.regions
.iter()
.find(|region| pointinpolygon(lat, lon, ®ion.boundary))
}
}
fn pointinpolygon(lat: f64, lon: f64, polygon: &[[f64; 2]]) -> bool {
let n = polygon.len();
if n < 3 {
return false;
}
let mut inside = false;
let mut j = n - 1;
for i in 0..n {
let (yi, xi) = (polygon[i][0], polygon[i][1]);
let (yj, xj) = (polygon[j][0], polygon[j][1]);
if ((yi > lat) != (yj > lat)) && (lon < (xj - xi) * (lat - yi) / (yj - yi) + xi) {
inside = !inside;
}
j = i;
}
inside
}