/// <summary>
/// Initializes a new RadMatrix, rotated by the specified angle (in degrees) at the provided origin.
/// </summary>
/// <param name="angle"></param>
/// <param name="origin"></param>
public RadMatrix(float angle, PointF origin)
{
if (angle == 0F || angle == 360F)
{
this = RadMatrix.Identity;
}
else
{
float cos;
float sin;
RadMatrix.GetCosSin(angle, out cos, out sin);
this.M11 = cos;
this.M12 = sin;
this.M21 = -sin;
this.M22 = cos;
//calculate DX and DY
if (origin != PointF.Empty)
{
float x = origin.X;
float y = origin.Y;
this.DX = x - (cos * x) + (sin * y);
this.DY = y - (cos * y) - (sin * x);
}
else
{
this.DX = 0F;
this.DY = 0F;
}
}
}
public void Invert()
{
if (this.IsIdentity)
{
return;
}
float determinant = this.Determinant;
if (determinant == 0F)
{
//nothing to invert, make us empty
this = Empty;
return;
}
float m11 = this.M22 / determinant;
float m12 = -this.M12 / determinant;
float m21 = -this.M21 / determinant;
float m22 = this.M11 / determinant;
float dx = (this.DX * -m11) - (this.DY * m21);
float dy = (this.DX * -m12) - (this.DY * m22);
this = new RadMatrix(m11, m12, m21, m22, dx, dy);
}
public RadMatrix(float angle, PointF origin)
{
if ((double)angle == 0.0 || (double)angle == 360.0)
{
this = RadMatrix.Identity;
}
else
{
float cos;
float sin;
RadMatrix.GetCosSin(angle, out cos, out sin);
this.M11 = cos;
this.M12 = sin;
this.M21 = -sin;
this.M22 = cos;
if (origin != PointF.Empty)
{
float x = origin.X;
float y = origin.Y;
this.DX = (float)((double)x - (double)cos * (double)x + (double)sin * (double)y);
this.DY = (float)((double)y - (double)cos * (double)y - (double)sin * (double)x);
}
else
{
this.DX = 0.0f;
this.DY = 0.0f;
}
}
}
/// <summary>
/// Copy constructor.
/// </summary>
/// <param name="source"></param>
public RadMatrix(RadMatrix source)
{
this.M11 = source.M11;
this.M12 = source.M12;
this.M21 = source.M21;
this.M22 = source.M22;
this.DX = source.DX;
this.DY = source.DY;
}
public void Multiply(RadMatrix m, MatrixOrder order)
{
if (order == MatrixOrder.Append)
{
this *= m;
}
else
{
this = m * this;
}
}
public void Invert()
{
if (this.IsIdentity)
{
return;
}
float determinant = this.Determinant;
if ((double)determinant == 0.0)
{
this = RadMatrix.Empty;
}
else
{
float m11 = this.M22 / determinant;
float m12 = -this.M12 / determinant;
float m21 = -this.M21 / determinant;
float m22 = this.M11 / determinant;
float dx = (float)((double)this.DX * -(double)m11 - (double)this.DY * (double)m21);
float dy = (float)((double)this.DX * -(double)m12 - (double)this.DY * (double)m22);
this = new RadMatrix(m11, m12, m21, m22, dx, dy);
}
}
public void Divide(RadMatrix m)
{
m.Invert();
this.Multiply(m, MatrixOrder.Prepend);
}
public void Multiply(RadMatrix m)
{
this.Multiply(m, MatrixOrder.Prepend);
}
public RadMatrix(float angle)
{
this = new RadMatrix(angle, PointF.Empty);
}
public RadMatrix(float scaleX, float scaleY)
{
this = new RadMatrix(scaleX, scaleY, PointF.Empty);
}