From d1a104bba46d2918c2a521e255edee07ea2e5f3f Mon Sep 17 00:00:00 2001
From: Antonis Geralis <43617260+planetis-m@users.noreply.github.com>
Date: Sat, 17 Dec 2022 13:13:40 +0200
Subject: [PATCH] Fix vector2angle (#2832)

* Fix vector2angle

* Fix ;

* use acosf

* need a break

* add comments
---
 src/raymath.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/raymath.h b/src/raymath.h
index 34db2d885..d3130750c 100644
--- a/src/raymath.h
+++ b/src/raymath.h
@@ -307,9 +307,15 @@ RMAPI float Vector2DistanceSqr(Vector2 v1, Vector2 v2)
 }
 
 // Calculate angle from two vectors
+// Parameters need to be normalized
 RMAPI float Vector2Angle(Vector2 v1, Vector2 v2)
 {
-    float result = -acos(v1.x*v2.x + v1.y*v2.y);
+    float dotProduct = v1.x*v2.x + v1.y*v2.y; // Dot product
+
+    float t = dotProduct < -1 ? -1 : dotProduct; // Clamp
+    if (t > 1) t = 1;
+
+    float result = acosf(t);
 
     return result;
 }