public void Matrix44Inverts()
{
var rowMajor = new float[] {
1, 2, 3, 0,
0, 1, 4, 0,
5, 6, 1, 0,
0, 0, 0, 1,
};
var expectedRowMajor = new float[] {
-11.5f, 8, 2.5f, 0,
10, -7, -2, 0,
-2.5f, 2, 0.5f, 0,
0, 0, 0, 1,
};
var determinant = 2f;
var matrix = SKMatrix44.FromRowMajor(rowMajor);
Assert.Equal(rowMajor, matrix.ToRowMajor());
Assert.Equal(determinant, matrix.Determinant());
var inverted = matrix.Invert();
Assert.Equal(1f / determinant, inverted.Determinant());
var actualRowMajor = inverted.ToRowMajor();
Assert.Equal(expectedRowMajor, actualRowMajor);
}
public void MatrixGoesFullCircle()
{
var rowMajor = new float[] {
1, 2, 3, 0,
0, 1, 4, 0,
5, 6, 1, 0,
0, 0, 0, 1,
};
var matrix = SKMatrix44.FromRowMajor(rowMajor);
var result = matrix.ToRowMajor();
Assert.Equal(rowMajor, result);
}
public void Matrix44ConvertsToMatrix()
{
var rowMajor44 = new float[] {
2, 3, 4, 5,
4, 6, 8, 10,
6, 9, 12, 15,
8, 12, 16, 20,
};
var rowMajor = new float[] {
rowMajor44[0], rowMajor44[1], rowMajor44[3],
rowMajor44[4], rowMajor44[5], rowMajor44[7],
rowMajor44[12], rowMajor44[13], rowMajor44[15],
};
var matrix44 = SKMatrix44.FromRowMajor(rowMajor44);
Assert.Equal(rowMajor, matrix44.Matrix.Values);
}
public void RowMajorColumnMajorTransposes()
{
var rowMajor = new float[] {
1, 2, 3, 0,
0, 1, 4, 0,
5, 6, 1, 0,
0, 0, 0, 1,
};
var colMajor = new float[] {
1, 0, 5, 0,
2, 1, 6, 0,
3, 4, 1, 0,
0, 0, 0, 1,
};
var rowMajorMatrix = SKMatrix44.FromRowMajor(rowMajor);
var colMajorMatrix = rowMajorMatrix.ToColumnMajor();
Assert.Equal(colMajor, colMajorMatrix);
}
public void Matrix44ConvertsToMatrix()
{
var rowMajor44 = new float[] {
2, 3, 4, 5,
4, 6, 8, 10,
6, 9, 12, 15,
8, 12, 16, 20,
};
var rowMajor = new float[] {
rowMajor44[0], rowMajor44[1], rowMajor44[3],
rowMajor44[4], rowMajor44[5], rowMajor44[7],
rowMajor44[12], rowMajor44[13], rowMajor44[15],
};
var matrix44 = SKMatrix44.FromRowMajor(rowMajor44);
Assert.Equal(rowMajor, matrix44.Matrix.Values);
matrix44 = SKMatrix44.CreateRotationDegrees(0, 0, 1, 45);
Assert.Equal(SKMatrix.MakeRotationDegrees(45).Values, matrix44.Matrix.Values);
}