From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Fri, 2 Apr 2021 21:41:38 +0000 (+0100)
Subject: geometry: Provide len
X-Git-Tag: otter-0.5.0~300
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=c20f3111caa7a5f61324b125db9f05c65d1fb99d;p=otter.git

geometry: Provide len

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/base/geometry.rs b/base/geometry.rs
index ab5527aa..6d424f06 100644
--- a/base/geometry.rs
+++ b/base/geometry.rs
@@ -113,6 +113,14 @@ impl<T> PosC<T> {
         b.checked_add(c2)
       })?
   }
+
+  #[throws(CoordinateOverflow)]
+  pub fn len(self) -> f64 where PosC<T>: PosPromote {
+    let d2 = self.len2()?;
+    let d = d2.sqrt();
+    if !d.is_finite() { throw!(CoordinateOverflow) }
+    d
+  }
 }
 impl<T> PosC<T> where T: Copy {
   pub fn x(self) -> T { self.coords[0] }