Implement Approx for Curve

crates/fj-kernel/src/algorithms/approx/curve.rs

@@ -2,9 +2,19 @@ use std::cmp::max;
 
 use fj_math::{Circle, Point, Scalar};
 
-use crate::objects::{CurveKind, GlobalCurve};
+use crate::objects::{Curve, CurveKind, GlobalCurve};
 
-use super::{Local, Tolerance};
+use super::{Approx, Local, Tolerance};
+
+impl Approx for Curve {
+    type Approximation = Vec<Local<Point<1>>>;
+
+    fn approx(&self, tolerance: Tolerance) -> Self::Approximation {
+        let mut points = Vec::new();
+        approx_curve(self.global(), tolerance, &mut points);
+        points
+    }
+}
 
 /// Compute an approximation of the curve
 ///

crates/fj-kernel/src/algorithms/approx/edge.rs

@@ -2,15 +2,13 @@ use fj_math::Point;
 
 use crate::objects::{Edge, Vertex, VerticesOfEdge};
 
-use super::{curve::approx_curve, Approx, Local};
+use super::{Approx, Local};
 
 impl Approx for Edge {
     type Approximation = Vec<Local<Point<1>>>;
 
     fn approx(&self, tolerance: super::Tolerance) -> Self::Approximation {
-        let mut points = Vec::new();
-
-        approx_curve(self.curve().global(), tolerance, &mut points);
+        let mut points = self.curve().approx(tolerance);
         approx_edge(*self.vertices(), &mut points);
 
         points