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Clean up internal Polygon code in preparation for just storing Rings. #951

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This commit is contained in:
Dustin Carlino 2022-09-03 13:48:43 +01:00
parent 82dcb3fdbc
commit b7172f876d
1 changed files with 17 additions and 25 deletions
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42
geom/src/polygon.rs
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@ -89,7 +89,8 @@ impl Polygon {
}
pub fn get_bounds(&self) -> Bounds {
Bounds::from(&self.points)
// Interiors should always be strictly contained within the polygon's exterior
Bounds::from(self.get_outer_ring().points())
}
/// Transformations must preserve Rings.
@ -357,8 +358,7 @@ impl Polygon {
/// Doesn't handle multiple crossings in and out.
pub fn clip_polyline(&self, input: &PolyLine) -> Option<Vec<Pt2D>> {
let ring = Ring::must_new(self.points.clone());
let hits = ring.all_intersections(input);
let hits = self.get_outer_ring().all_intersections(input);
if hits.is_empty() {
// All the points must be inside, or none
@ -388,7 +388,7 @@ impl Polygon {
// TODO Only handles a few cases
pub fn clip_ring(&self, input: &Ring) -> Option<Vec<Pt2D>> {
let ring = Ring::must_new(self.points.clone());
let ring = self.get_outer_ring();
let hits = ring.all_intersections(&PolyLine::unchecked_new(input.clone().into_points()));
if hits.is_empty() {
@ -421,31 +421,23 @@ impl Polygon {
None
}
/// If the polygon is just a single outer ring, produces a GeoJSON polygon. Otherwise, produces
/// a GeoJSON multipolygon consisting of individual triangles. Optionally map the world-space
/// points back to GPS.
/// Optionally map the world-space points back to GPS.
pub fn to_geojson(&self, gps: Option<&GPSBounds>) -> geojson::Geometry {
if let Ok(ring) = Ring::new(self.points.clone()) {
return ring.to_geojson(gps);
use geo::MapCoordsInPlace;
let mut geom: geo::Geometry = self.to_geo().into();
if let Some(ref gps_bounds) = gps {
geom.map_coords_in_place(|c| {
let gps = Pt2D::new(c.x, c.y).to_gps(gps_bounds);
(gps.x(), gps.y()).into()
});
}
let mut polygons = Vec::new();
for triangle in self.triangles() {
let raw_pts = vec![triangle.pt1, triangle.pt2, triangle.pt3, triangle.pt1];
let mut pts = Vec::new();
if let Some(gps) = gps {
for pt in gps.convert_back(&raw_pts) {
pts.push(vec![pt.x(), pt.y()]);
}
} else {
for pt in raw_pts {
pts.push(vec![pt.x(), pt.y()]);
}
}
polygons.push(vec![pts]);
geojson::Geometry {
bbox: None,
value: geojson::Value::from(&geom),
foreign_members: None,
}
geojson::Geometry::new(geojson::Value::MultiPolygon(polygons))
}
/// Extracts all polygons from raw bytes representing a GeoJSON file, along with the string