Replace Edge::circle with Edges::add_circle

See previous commit for an explanation.

src/kernel/shape/edges.rs

@@ -1,6 +1,9 @@
-use crate::kernel::{
-    geometry::{Curve, Line},
-    topology::{edges::Edge, vertices::Vertex},
+use crate::{
+    kernel::{
+        geometry::{Curve, Line, Circle},
+        topology::{edges::Edge, vertices::Vertex},
+    },
+    math::{Scalar, Vector, Point},
 };
 
 use super::handle::{Handle, Storage};
@@ -27,6 +30,20 @@ impl Edges {
         Storage::new(edge).handle()
     }
 
+    /// Add a circle to the shape
+    ///
+    /// Calls [`Edges::add`] internally, and is subject to the same
+    /// restrictions.
+    pub fn add_circle(&mut self, radius: Scalar) -> Handle<Edge> {
+        self.add(Edge {
+            curve: Curve::Circle(Circle {
+                center: Point::origin(),
+                radius: Vector::from([radius, Scalar::ZERO]),
+            }),
+            vertices: None,
+        })
+    }
+
     /// Add a line segment to the shape
     ///
     /// Calls [`Edges::add`] internally, and is subject to the same

src/kernel/shapes/circle.rs

@@ -3,10 +3,7 @@ use crate::{
     kernel::{
         geometry::Surface,
         shape::Shape,
-        topology::{
-            edges::{Cycle, Edge},
-            faces::Face,
-        },
+        topology::{edges::Cycle, faces::Face},
     },
     math::{Aabb, Point, Scalar},
 };
@@ -20,9 +17,7 @@ impl ToShape for fj::Circle {
         // Circles have just a single round edge with no vertices. So none need
         // to be added here.
 
-        let edge = shape
-            .edges()
-            .add(Edge::circle(Scalar::from_f64(self.radius)));
+        let edge = shape.edges().add_circle(Scalar::from_f64(self.radius));
         shape.cycles().add(Cycle { edges: vec![edge] });
 
         let cycles = shape.cycles().all().collect();

src/kernel/topology/edges.rs

@@ -1,10 +1,4 @@
-use crate::{
-    kernel::{
-        geometry::{Circle, Curve},
-        shape::handle::Handle,
-    },
-    math::{Point, Scalar, Vector},
-};
+use crate::kernel::{geometry::Curve, shape::handle::Handle};
 
 use super::vertices::Vertex;
 
@@ -44,16 +38,3 @@ pub struct Edge {
     /// and store 1D vertices again, at some point.
     pub vertices: Option<[Handle<Vertex>; 2]>,
 }
-
-impl Edge {
-    /// Create a circle
-    pub fn circle(radius: Scalar) -> Self {
-        Edge {
-            curve: Curve::Circle(Circle {
-                center: Point::origin(),
-                radius: Vector::from([radius, Scalar::ZERO]),
-            }),
-            vertices: None,
-        }
-    }
-}