/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkMatrixToLinearTransform.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
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=========================================================================*/

// .NAME vtkMatrixToLinearTransform - convert a matrix to a transform
// .SECTION Description
// This is a very simple class which allows a vtkMatrix4x4 to be used in
// place of a vtkLinearTransform or vtkAbstractTransform.  For example,
// if you use it as a proxy between a matrix and vtkTransformPolyDataFilter
// then any modifications to the matrix will automatically be reflected in
// the output of the filter.
// .SECTION See Also
// vtkTransform vtkMatrix4x4 vtkMatrixToHomogeneousTransform 

#ifndef __vtkMatrixToLinearTransform_h
#define __vtkMatrixToLinearTransform_h

#include "vtkLinearTransform.h"
#include "vtkMatrix4x4.h"

class VTK_EXPORT vtkMatrixToLinearTransform : public vtkLinearTransform
{
 public:
  static vtkMatrixToLinearTransform *New();
  vtkTypeMacro(vtkMatrixToLinearTransform,vtkLinearTransform);
  void PrintSelf (ostream& os, vtkIndent indent);

  // Description:
  // Set the input matrix.  Any modifications to the matrix will be
  // reflected in the transformation.
  vtkSetObjectMacro(Input,vtkMatrix4x4);
  vtkGetObjectMacro(Input,vtkMatrix4x4);

  // Description:
  // The input matrix is left as-is, but the transformation matrix
  // is inverted.
  void Inverse();

  // Description:
  // Get the MTime: this is the bit of magic that makes everything work.
  unsigned long GetMTime();

  // Description:
  // Make a new transform of the same type.
  vtkAbstractTransform *MakeTransform();

  // Description:
  // This method is deprecated.
  void SetMatrix(vtkMatrix4x4 *matrix) {
    this->SetInput(matrix);
    vtkWarningMacro("SetMatrix: deprecated, use SetInput() instead"); }

protected:
  vtkMatrixToLinearTransform();
  ~vtkMatrixToLinearTransform();
  vtkMatrixToLinearTransform(const vtkMatrixToLinearTransform&) {};
  void operator=(const vtkMatrixToLinearTransform&) {};

  void InternalUpdate();
  void InternalDeepCopy(vtkAbstractTransform *transform);

  int InverseFlag;
  vtkMatrix4x4 *Input;
};

#endif
