Scaling corrections

1 files changed, 14 insertions, 1 deletions

diff --git a/UVtools.Core/Extensions/EmguExtensions.cs b/UVtools.Core/Extensions/EmguExtensions.cs
index 7253837..53f78e2 100644
--- a/UVtools.Core/Extensions/EmguExtensions.cs
+++ b/UVtools.Core/Extensions/EmguExtensions.cs
@@ -10,7 +10,7 @@ using System;
 using System.Drawing;
 using System.Runtime.InteropServices;
 using Emgu.CV;
-using Emgu.CV.Structure;
+using Emgu.CV.CvEnum;
 
 namespace UVtools.Core.Extensions
 {
@@ -28,6 +28,19 @@ namespace UVtools.Core.Extensions
             return mat.GetPixelSpan<T>().Slice(offset, mat.Step);
         }
 
+        public static void ScaleFromCenter(this Mat src, double xScale, double yScale, double xTrans = 0, double yTrans = 0, Inter interpolation = Inter.Linear)
+        {
+            //var dst = new Mat(src.Size, src.Depth, src.NumberOfChannels);
+            var translateTransform = new Matrix<double>(2, 3)
+            {
+                [0, 0] = xScale, // xScale
+                [1, 1] = yScale, // yScale
+                [0, 2] = xTrans + (src.Width - src.Width * xScale) / 2.0, //x translation + compensation of  x scaling
+                [1, 2] = yTrans + (src.Height - src.Height * yScale) / 2.0 // y translation + compensation of y scaling
+            };
+            CvInvoke.WarpAffine(src, src, translateTransform, src.Size, interpolation);
+        }
+
         public static void CopyToCenter(this Mat src, Mat dst)
         {
             if (dst.Step > src.Step && dst.Height > src.Height)