/// <summary>
/// Are these matrices equal.
/// </summary>
public override bool Equals(object obj)
{
if (!(obj is Matrix2x2d))
{
return(false);
}
Matrix2x2d mat = (Matrix2x2d)obj;
return(this == mat);
}
/// <summary>
/// Multiply a matrix by a scalar.
/// </summary>
public static Matrix2x2d operator *(double s, Matrix2x2d m)
{
Matrix2x2d kProd = new Matrix2x2d();
kProd.m00 = m.m00 * s;
kProd.m10 = m.m10 * s;
kProd.m01 = m.m01 * s;
kProd.m11 = m.m11 * s;
return(kProd);
}
/// <summary>
/// Multiply two matrices.
/// </summary>
public static Matrix2x2d operator *(Matrix2x2d m1, Matrix2x2d m2)
{
Matrix2x2d kProd = new Matrix2x2d();
kProd.m00 = m1.m00 * m2.m00 + m1.m01 * m2.m10;
kProd.m10 = m1.m10 * m2.m00 + m1.m11 * m2.m10;
kProd.m01 = m1.m00 * m2.m01 + m1.m01 * m2.m11;
kProd.m11 = m1.m10 * m2.m01 + m1.m11 * m2.m11;
return(kProd);
}
/// <summary>
/// Add two matrices.
/// </summary>
public static Matrix2x2d operator +(Matrix2x2d m1, Matrix2x2d m2)
{
Matrix2x2d kSum = new Matrix2x2d();
kSum.m00 = m1.m00 + m2.m00;
kSum.m10 = m1.m10 + m2.m10;
kSum.m01 = m1.m01 + m2.m01;
kSum.m11 = m1.m11 + m2.m11;
return(kSum);
}
/// <summary>
/// The Inverse of the matrix copied into mInv.
/// Returns false if the matrix has no inverse.
/// A matrix multipled by its inverse is the idenity.
/// </summary>
public bool TryInverse(ref Matrix2x2d mInv)
{
double det = Determinant;
if (DMath.IsZero(det))
{
return(false);
}
double invDet = 1.0 / det;
mInv.m00 = m11 * invDet;
mInv.m01 = -m01 * invDet;
mInv.m10 = -m10 * invDet;
mInv.m11 = m00 * invDet;
return(true);
}
/// <summary>
/// Are these matrices equal.
/// </summary>
public bool EqualsWithError(Matrix2x2d m, double eps)
{
if (Math.Abs(m00 - m.m00) > eps)
{
return(false);
}
if (Math.Abs(m10 - m.m10) > eps)
{
return(false);
}
if (Math.Abs(m01 - m.m01) > eps)
{
return(false);
}
if (Math.Abs(m11 - m.m11) > eps)
{
return(false);
}
return(true);
}
/// <summary>
/// Are these matrices equal.
/// </summary>
public bool Equals(Matrix2x2d mat)
{
return(this == mat);
}
