From 17aca44a3b71e1877c5e684c8164a7284f31d271 Mon Sep 17 00:00:00 2001
From: PrecisionRender <austin08dean@gmail.com>
Date: Sat, 15 Apr 2023 16:40:03 -0500
Subject: [PATCH] Add `MoveTowards` functions to C++ `Math`

---
 Source/Engine/Core/Math/Math.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/Source/Engine/Core/Math/Math.h b/Source/Engine/Core/Math/Math.h
index 162acc97fe..0c9a07841c 100644
--- a/Source/Engine/Core/Math/Math.h
+++ b/Source/Engine/Core/Math/Math.h
@@ -386,6 +386,36 @@ namespace Math
         return Min(Min(Min(a, b), c), d);
     }
 
+    /// <summary>
+    /// Moves a value current towards target.
+    /// </summary>
+    /// <param name="current">The current value.</param>
+    /// <param name="target">The value to move towards.</param>
+    /// <param name="maxDelta">The maximum change that should be applied to the value.</param>
+    template<class T>
+    float MoveTowards(const T current, const T target, const T maxDelta)
+    {
+        if (Abs(target - current) <= maxDelta)
+            return target;
+        return current + Sign(target - current) * maxDelta;
+    }
+
+    /// <summary>
+    /// Same as MoveTowards but makes sure the values interpolate correctly when they wrap around 360 degrees.
+    /// </summary>
+    /// <param name="current"></param>
+    /// <param name="target"></param>
+    /// <param name="maxDelta"></param>
+    template<class T>
+    float MoveTowardsAngle(const T current, const T target, const T maxDelta)
+    {
+        float delta = DeltaAngle(current, target);
+        if ((-maxDelta < delta) && (delta < maxDelta))
+            return target;
+        target = current + delta;
+        return MoveTowards(current, target, maxDelta);
+    }
+
     // Multiply value by itself
     template<class T>
     static T Square(const T a)