From 6a0e1b9719061253e4cbca5085e5334e2dfc1ed4 Mon Sep 17 00:00:00 2001
From: Hanno Braun <hanno@braun-odw.eu>
Date: Wed, 13 Jul 2022 17:57:23 +0200
Subject: [PATCH 1/3] Add `CurveFaceIntersectionList::is_empty`

---
 crates/fj-kernel/src/algorithms/intersection/curve_face.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/crates/fj-kernel/src/algorithms/intersection/curve_face.rs b/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
index e8334460b..c33dff638 100644
--- a/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
+++ b/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
@@ -159,6 +159,11 @@ impl CurveFaceIntersectionList {
 
         Self { intervals }
     }
+
+    /// Indicate whether the intersection list is empty
+    pub fn is_empty(&self) -> bool {
+        self.intervals.is_empty()
+    }
 }
 
 #[cfg(test)]

From abc4f291ff11bb2a0fc6f2681fbb723373926d3c Mon Sep 17 00:00:00 2001
From: Hanno Braun <hanno@braun-odw.eu>
Date: Thu, 14 Jul 2022 14:24:24 +0200
Subject: [PATCH 2/3] Add `CurveFaceIntersection`

---
 crates/fj-kernel/src/algorithms/intersection/curve_face.rs | 5 ++++-
 crates/fj-kernel/src/algorithms/intersection/mod.rs        | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/crates/fj-kernel/src/algorithms/intersection/curve_face.rs b/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
index c33dff638..162bf5f08 100644
--- a/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
+++ b/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
@@ -6,7 +6,7 @@ use crate::objects::{Curve, Face};
 /// The intersections between a [`Curve`] and a [`Face`], in curve coordinates
 #[derive(Clone, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
 pub struct CurveFaceIntersectionList {
-    intervals: Vec<[Scalar; 2]>,
+    intervals: Vec<CurveFaceIntersection>,
 }
 
 impl CurveFaceIntersectionList {
@@ -166,6 +166,9 @@ impl CurveFaceIntersectionList {
     }
 }
 
+/// An intersection between a curve and a face, in curve coordinates
+pub type CurveFaceIntersection = [Scalar; 2];
+
 #[cfg(test)]
 mod tests {
     use fj_math::{Line, Point, Vector};
diff --git a/crates/fj-kernel/src/algorithms/intersection/mod.rs b/crates/fj-kernel/src/algorithms/intersection/mod.rs
index 109177f97..a67988b48 100644
--- a/crates/fj-kernel/src/algorithms/intersection/mod.rs
+++ b/crates/fj-kernel/src/algorithms/intersection/mod.rs
@@ -5,7 +5,7 @@ mod line_segment;
 mod surface_surface;
 
 pub use self::{
-    curve_face::CurveFaceIntersectionList,
+    curve_face::{CurveFaceIntersection, CurveFaceIntersectionList},
     line_segment::{line_segment, LineSegmentIntersection},
     surface_surface::surface_surface,
 };

From 6f7b6ceff21232ecba9d5ac4afce6b4a455d880d Mon Sep 17 00:00:00 2001
From: Hanno Braun <hanno@braun-odw.eu>
Date: Thu, 14 Jul 2022 14:26:53 +0200
Subject: [PATCH 3/3] Implement `IntoIterator` for intersection list

---
 .../src/algorithms/intersection/curve_face.rs         | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/crates/fj-kernel/src/algorithms/intersection/curve_face.rs b/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
index 162bf5f08..201263d18 100644
--- a/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
+++ b/crates/fj-kernel/src/algorithms/intersection/curve_face.rs
@@ -1,3 +1,5 @@
+use std::vec;
+
 use fj_math::{Scalar, Segment};
 use parry2d_f64::query::{Ray, RayCast};
 
@@ -166,6 +168,15 @@ impl CurveFaceIntersectionList {
     }
 }
 
+impl IntoIterator for CurveFaceIntersectionList {
+    type Item = CurveFaceIntersection;
+    type IntoIter = vec::IntoIter<Self::Item>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.intervals.into_iter()
+    }
+}
+
 /// An intersection between a curve and a face, in curve coordinates
 pub type CurveFaceIntersection = [Scalar; 2];