Output as GeoJson

See georust/geojson#161

src/lib.rs

@@ -1,4 +1,5 @@
 use geo::{map_coords::MapCoordsInplace, LineString, Point, Polygon};
+use geojson::{GeoJson, Feature, FeatureCollection, Geometry};
 use std::convert::TryInto;
 use std::default::Default;
 
@@ -39,7 +40,7 @@ pub fn clockboard(
     centerpoint: Point<f64>,
     params: Params,
     //boundary: Option<Polygon<f64>>,
-) -> Vec<Polygon<f64>> {
+) -> GeoJson {
     let mut polygons = Vec::new();
     for i in params.distances {
         // println!("{}", i); // debugging
@@ -51,7 +52,25 @@ pub fn clockboard(
         round(polygon, params.precision);
     }
 
-    polygons
+    let mut features: Vec<Feature> = polygons
+    .iter()
+    .map(|poly| Feature {
+        bbox: None,
+        geometry: Some(Geometry::from(poly)),
+        id: None,
+        properties: None,
+        foreign_members: None,
+    })
+    .collect();
+
+    let fc = FeatureCollection {
+        bbox: None,
+        features,
+        foreign_members: None,
+    };
+
+    let gj = GeoJson::from(fc);
+    gj
 }
 
 fn makecircle(centerpoint: Point<f64>, radius: f64, num_vertices: usize) -> Polygon<f64> {

src/main.rs

@@ -1,20 +1,22 @@
 use geo::Point;
-// use serde_json::to_string_pretty;
+use serde_json;
+use serde_json::{to_string_pretty};
 use zonebuilder::clockboard;
 use zonebuilder::Params;
 
 fn main() {
-    let polygon_list = clockboard(Point::new(0.0, 0.0), Params::default());
+    let gj = clockboard(Point::new(0.0, 0.0), Params::default());
 
     // Attempt to print pretty json - not outputting valid json currently
     // See https://github.com/georust/geojson/issues/161 for details
     // let geojson_list = geojson::Value::from(&polygon_list[0]);
     // let result = serde_json::to_string_pretty(&geojson_list);
     // println!("{}", result.unwrap());
 
-    // Brute force approach: for loop
-    for polygon in polygon_list {
-        let result = geojson::Value::from(&polygon);
-        println!("{}", result);
-    }
+    let gjstring = to_string_pretty(&gj);
+
+    // Which we can print / dump / etc:
+
+    println!("{}", &gjstring);
+
 }