public void Matrix3x2DeterminantTest1()
{
Matrix3x2 a = new Matrix3x2();
a.M11 = 5.0f;
a.M12 = 2.0f;
a.M21 = 12.0f;
a.M22 = 6.8f;
a.M31 = 6.5f;
a.M32 = 1.0f;
Matrix3x2 i;
Assert.True(Matrix3x2.Invert(a, out i));
Single detA = a.GetDeterminant();
Single detI = i.GetDeterminant();
Single t = 1.0f / detI;
// only accurate to 3 precision
Assert.True(Math.Abs(detA - t) < 1e-3, "Matrix3x2.Determinant was not set correctly.");
// sanity check against 4x4 version
Assert.Equal(new Matrix4x4(a).GetDeterminant(), detA);
Assert.Equal(new Matrix4x4(i).GetDeterminant(), detI);
}
public void Matrix3x2InvertTest1()
{
Matrix3x2 a = new Matrix3x2();
a.M11 = 0.0f;
a.M12 = 2.0f;
a.M21 = 0.0f;
a.M22 = 4.0f;
a.M31 = 5.0f;
a.M32 = 6.0f;
Single detA = a.GetDeterminant();
Assert.True(MathHelper.Equal(detA, 0.0f), "Matrix3x2.Invert did not return the expected value.");
Matrix3x2 actual;
Assert.False(Matrix3x2.Invert(a, out actual));
// all the elements in Actual is NaN
Assert.True(
Single.IsNaN(actual.M11) && Single.IsNaN(actual.M12) &&
Single.IsNaN(actual.M21) && Single.IsNaN(actual.M22) &&
Single.IsNaN(actual.M31) && Single.IsNaN(actual.M32)
, "Matrix3x2.Invert did not return the expected value.");
}
public void Matrix3x2InvertIdentityTest()
{
Matrix3x2 mtx = Matrix3x2.Identity;
Matrix3x2 actual;
Assert.True(Matrix3x2.Invert(mtx, out actual));
Assert.True(MathHelper.Equal(actual, Matrix3x2.Identity));
}
public void Matrix3x2InvertScaleTest()
{
Matrix3x2 mtx = Matrix3x2.CreateScale(23, -42);
Matrix3x2 actual;
Assert.True(Matrix3x2.Invert(mtx, out actual));
Matrix3x2 i = mtx * actual;
Assert.True(MathHelper.Equal(i, Matrix3x2.Identity));
}
public void Matrix3x2InvertRotationTest()
{
Matrix3x2 mtx = Matrix3x2.CreateRotation(2);
Matrix3x2 actual;
Assert.True(Matrix3x2.Invert(mtx, out actual));
Matrix3x2 i = mtx * actual;
Assert.True(MathHelper.Equal(i, Matrix3x2.Identity));
}
public void Matrix3x2InvertAffineTest()
{
Matrix3x2 mtx = Matrix3x2.CreateRotation(2) *
Matrix3x2.CreateScale(23, -42) *
Matrix3x2.CreateTranslation(17, 53);
Matrix3x2 actual;
Assert.True(Matrix3x2.Invert(mtx, out actual));
Matrix3x2 i = mtx * actual;
Assert.True(MathHelper.Equal(i, Matrix3x2.Identity));
}
public void Matrix3x2InvertTest()
{
Matrix3x2 mtx = Matrix3x2.CreateRotation(MathHelper.ToRadians(30.0f));
Matrix3x2 expected = new Matrix3x2();
expected.M11 = 0.8660254f;
expected.M12 = -0.5f;
expected.M21 = 0.5f;
expected.M22 = 0.8660254f;
expected.M31 = 0;
expected.M32 = 0;
Matrix3x2 actual;
Assert.True(Matrix3x2.Invert(mtx, out actual));
Assert.True(MathHelper.Equal(expected, actual), "Matrix3x2.Invert did not return the expected value.");
Matrix3x2 i = mtx * actual;
Assert.True(MathHelper.Equal(i, Matrix3x2.Identity), "Matrix3x2.Invert did not return the expected value.");
}