class HGeomRotation: public TObject

_HADES_CLASS_DESCRIPTION

 HGeomRotation

 This class defines a 3x3 rotation matrix.
 The data are stored in a linear array with 9 Double_t
 components.

 Inline functions:

 Constructors:
   HGeomRotation()
   HGeomRotation(const HGeomRotation& r)
   HGeomRotation(const Double_t* a)

 Access to components:
   Double_t operator () (Int_t) const
   void setElement(const Double_t,const Int_t)

 Check for equality/inequality
   Bool_t operator == (const HGeomRotation&)
   Bool_t operator != (const HGeomRotation&)

 HGeomRotation& operator = (const HGeomRotation&);
      assignment

 void setUnitMatrix()
      sets identity matrix

 void setZero()
      sets all components to 0.0

 Bool_t isUnitMatrix()
      checks unity

 HGeomRotation& invert()
      inverts the matrix

 HGeomRotation inverse()
      copies the matrix and returns the inverse of the copy

 Double_t determinant() const;
      returns determinate

 HGeomRotation& operator *= (const HGeomRotation&);
      multiplies with the given rotation matrix from the right

 HGeomRotation& transform(const HGeomRotation&);
      multiplies with the given rotation matrix from the left

 HGeomVector operator * (const HGeomVector&) const;
      rotates a vector

 HGeomRotation operator * (const HGeomRotation&) const;
      rotates the given rotation

 void print()
      shows the matrix


 Euler Angles:
   1. angle:  rotation around z-axis   --> x1, y1, z1=z
   2. angle:  rotation around y1-axis  --> x2, y2=y1, z2
   3. angle:  rotation around z2-axis  --> x3, y3, z3=z2