From 1aba027462a861f2c1155672792dbbe555d7dc0a Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 13 Jan 2025 01:45:43 +0000
Subject: Add distance helper

Works with integer positions, first template param allows forcing to N dimensions
---
 lib/maths.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'lib/maths.h')

diff --git a/lib/maths.h b/lib/maths.h
index 17ca795..3d4f440 100644
--- a/lib/maths.h
+++ b/lib/maths.h
@@ -111,6 +111,13 @@ difference(const glm::vec<D, T, Q> & globalA, const glm::vec<D, T, Q> & globalB)
 	return globalA - globalB;
 }
 
+template<glm::length_t D, Arithmetic T, glm::qualifier Q = glm::defaultp>
+constexpr auto
+distance(const glm::vec<D, T, Q> & pointA, const glm::vec<D, T, Q> & pointB)
+{
+	return glm::length(difference(pointA, pointB));
+}
+
 glm::mat4 flat_orientation(const Rotation3D & diff);
 
 namespace {
@@ -498,7 +505,7 @@ operator"" _degrees(long double degrees)
 // Late implementations due to dependencies
 template<typename T, glm::qualifier Q>
 constexpr ArcSegment<T, Q>::ArcSegment(PointType centre, PointType ep0, PointType ep1) :
-	Arc {centre, ep0, ep1}, centre {centre}, ep0 {ep0}, ep1 {ep1}, radius {glm::length(difference(centre, ep0))}
+	Arc {centre, ep0, ep1}, centre {centre}, ep0 {ep0}, ep1 {ep1}, radius {::distance(centre, ep0)}
 {
 }
 
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