From e01e14d4dacda37bb736ced5074dffca352dfd09 Mon Sep 17 00:00:00 2001
From: Hanno Braun <hanno@braun-odw.eu>
Date: Sat, 9 Apr 2022 15:20:12 +0200
Subject: [PATCH 1/2] Add `PolyChain::new`

---
 fj-math/src/poly_chain.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fj-math/src/poly_chain.rs b/fj-math/src/poly_chain.rs
index 8f566cb58..f9726384e 100644
--- a/fj-math/src/poly_chain.rs
+++ b/fj-math/src/poly_chain.rs
@@ -11,6 +11,11 @@ pub struct PolyChain<const D: usize> {
 }
 
 impl<const D: usize> PolyChain<D> {
+    /// Create an empty `PolyChain`
+    pub fn new() -> Self {
+        Self { points: Vec::new() }
+    }
+
     /// Construct a polygonal chain from a number of points
     pub fn from_points(
         points: impl IntoIterator<Item = impl Into<Point<D>>>,
@@ -48,6 +53,12 @@ impl<const D: usize> PolyChain<D> {
     }
 }
 
+impl<const D: usize> Default for PolyChain<D> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl<P, Ps, const D: usize> From<Ps> for PolyChain<D>
 where
     P: Into<Point<D>>,

From 17b8b91f63a6c614f0a0ca10991edee6f52ca3d4 Mon Sep 17 00:00:00 2001
From: Hanno Braun <hanno@braun-odw.eu>
Date: Sat, 9 Apr 2022 15:24:38 +0200
Subject: [PATCH 2/2] Add `PolyChain::reverse`

---
 fj-math/src/poly_chain.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fj-math/src/poly_chain.rs b/fj-math/src/poly_chain.rs
index f9726384e..0c762226d 100644
--- a/fj-math/src/poly_chain.rs
+++ b/fj-math/src/poly_chain.rs
@@ -51,6 +51,12 @@ impl<const D: usize> PolyChain<D> {
 
         self
     }
+
+    /// Reverse the order of points in the `PolyChain`
+    pub fn reverse(mut self) -> Self {
+        self.points.reverse();
+        self
+    }
 }
 
 impl<const D: usize> Default for PolyChain<D> {