Reference IMatrix

  IMatrix = interface
  public
    { Set the six values of the matrix }
    procedure Copy(A, B, C, D, E, F: Float); overload;
    { Copy the values of another matrix }
    procedure Copy(M: IMatrix); overload;
    { Reset to the identity matrix }
    procedure Identity;
    { Returns the inverse as a new matrix }
    function Inverse: IMatrix;
    { Move by an offset }
    procedure Translate(X, Y: Float);
    { Rotate by an angle }
    procedure Rotate(Angle: Float);
    { Rotate by an angle about a point }
    procedure RotateAt(Angle, X, Y: Float);
    { Scale along each axis }
    procedure Scale(SX, SY: Float);
    { Scale along each axis about a point }
    procedure ScaleAt(SX, SY, X, Y: Float);
    { Skew along the x axis }
    procedure SkewX(X: Float);
    { Skew along the y axis }
    procedure SkewY(Y: Float);
    { Combine with another matrix }
    procedure Transform(M: IMatrix);
    { Creates new matrix C using the formula: C = A * B A is this matrix, B is
      the matrix passed below, and C is the result }
    function Multiply(M: IMatrix): IMatrix; overload;
    { Creates a new point C using the formula: C = A * B A is this matrix, B is
      the point passed below, and C is the result }
    function Multiply(const P: TPointF): TPointF; overload;
    { Preserve the matrix state by pushing it onto a stack }
    procedure Push;
    { Restore the matrix state by popping it from a stack }
    procedure Pop;
  end;