diff --git a/src/Avalonia.Base/Matrix.cs b/src/Avalonia.Base/Matrix.cs index 5bbc657385..8d3227378f 100644 --- a/src/Avalonia.Base/Matrix.cs +++ b/src/Avalonia.Base/Matrix.cs @@ -450,13 +450,13 @@ namespace Avalonia inverted = new Matrix( (_m22 * _m33 - _m32 * _m23) * invdet, - (_m13 * _m31 - _m12 * _m33) * invdet, + (_m13 * _m32 - _m12 * _m33) * invdet, (_m12 * _m23 - _m13 * _m22) * invdet, (_m23 * _m31 - _m21 * _m33) * invdet, (_m11 * _m33 - _m13 * _m31) * invdet, (_m21 * _m13 - _m11 * _m23) * invdet, (_m21 * _m32 - _m31 * _m22) * invdet, - (_m21 * _m12 - _m11 * _m32) * invdet, + (_m31 * _m12 - _m11 * _m32) * invdet, (_m11 * _m22 - _m21 * _m12) * invdet ); diff --git a/tests/Avalonia.Base.UnitTests/Media/MatrixTests.cs b/tests/Avalonia.Base.UnitTests/Media/MatrixTests.cs index 98b1ff0e28..4aa13fab3a 100644 --- a/tests/Avalonia.Base.UnitTests/Media/MatrixTests.cs +++ b/tests/Avalonia.Base.UnitTests/Media/MatrixTests.cs @@ -30,6 +30,16 @@ namespace Avalonia.Base.UnitTests.Media Assert.True(matrix.HasInverse); } + [Fact] + public void Invert_Should_Work() + { + var matrix = new Matrix(1, 2, 3, 0, 1, 4, 5, 6, 0); + var inverted = matrix.Invert(); + + Assert.Equal(matrix * inverted, Matrix.Identity); + Assert.Equal(inverted * matrix, Matrix.Identity); + } + [Fact] public void Can_Decompose_Translation() {