From b4da9ecbece9a528560e891ca461257ff321829f Mon Sep 17 00:00:00 2001
From: johncbaur <46469358+johncbaur@users.noreply.github.com>
Date: Fri, 30 Aug 2024 10:04:40 -0500
Subject: [PATCH] VIX-3585 Fixing interpolation bug when consecutive points
 have the same Y value

VIX-3585 Fixing interpolation bug when consecutive points have the same Y value
---
 src/Vixen.Modules/App/Curves/ZedGraph/PointPairList.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/Vixen.Modules/App/Curves/ZedGraph/PointPairList.cs b/src/Vixen.Modules/App/Curves/ZedGraph/PointPairList.cs
index 70ca85358..569338f9a 100644
--- a/src/Vixen.Modules/App/Curves/ZedGraph/PointPairList.cs
+++ b/src/Vixen.Modules/App/Curves/ZedGraph/PointPairList.cs
@@ -649,6 +649,13 @@ public double InterpolateX(double xTarget)
 					throw new Exception("Error: Infinite loop in interpolation");
 			}
 
+			// If the point Y values are identical there is no need to interpolate
+			//.This avoids returning NaN
+			if (this[hi].Y == this[lo].Y)
+			{
+				return this[hi].Y;
+			}
+
 			return (xTarget - this[lo].X)/(this[hi].X - this[lo].X)*
 			       (this[hi].Y - this[lo].Y) + this[lo].Y;
 		}