Merge pull request #7 from dotnet-campus/t/walterlv/identity

添加判断单位矩阵

Author: SeWZC

DotNetCampus.Numerics.Geometry/AffineTransformation2DExtensions.cs

@@ -16,4 +16,15 @@ public static bool HasInverse(this AffineTransformation2D transformation)
         var det = transformation.M11 * transformation.M22 - transformation.M12 * transformation.M21;
         return det != 0;
     }
-}
+
+    /// <summary>
+    /// 判断是否为单位矩阵的仿射变换。
+    /// </summary>
+    /// <param name="transformation">要判断的仿射变换。</param>
+    /// <returns>如果是单位矩阵，则返回 <see langword="true"/>；否则返回 <see langword="false"/>。</returns>
+    public static bool IsIdentity(this AffineTransformation2D transformation)
+    {
+        ArgumentNullException.ThrowIfNull(transformation);
+        return transformation is { M11: 1, M12: 0, M21: 0, M22: 1, OffsetX: 0, OffsetY: 0 };
+    }
+}

DotNetCampus.Numerics.sln

@@ -18,6 +18,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{FF8212D2
 		.editorconfig = .editorconfig
 		Directory.Build.props = Directory.Build.props
 		Directory.Packages.props = Directory.Packages.props
+		Build\Version.props = Build\Version.props
 	EndProjectSection
 EndProject
 Global