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

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

  Copyright (c) 1993-2002 Ken Martin, Will Schroeder, Bill Lorensen 
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkImageReslice - Reslices a volume along a new set of axes.
// .SECTION Description
// vtkImageReslice is the swiss-army-knife of image geometry filters:  
// It can permute, rotate, flip, scale, resample, deform, and pad image
// data in any combination with reasonably high efficiency.  Simple
// operations such as permutation, resampling and padding are done
// with similar efficiently to the specialized vtkImagePermute,
// vtkImageResample, and vtkImagePad filters.  There are a number of
// tasks that vtkImageReslice is well suited for:
// <p>1) Application of simple rotations, scales, and translations to
// an image. It is often a good idea to use vtkImageChangeInformation
// to center the image first, so that scales and rotations occur around
// the center rather than around the lower-left corner of the image.
// <p>2) Resampling of one data set to match the voxel sampling of 
// a second data set via the SetInformationInput() method, e.g. for
// the purpose of comparing two images or combining two images.
// A transformation, either linear or nonlinear, can be applied 
// at the same time via the SetResliceTransform method if the two
// images are not in the same coordinate space.
// <p>3) Extraction of slices from an image volume.  The most convenient
// way to do this is to use SetResliceAxesDirectionCosines() to
// specify the orientation of the slice.  The direction cosines give
// the x, y, and z axes for the output volume.  The method 
// SetOutputDimensionality(2) is used to specify that want to output a
// slice rather than a volume.  The SetResliceAxesOrigin() command is
// used to provide an (x,y,z) point that the slice will pass through.
// You can use both the ResliceAxes and the ResliceTransform at the
// same time, in order to extract slices from a volume that you have
// applied a transformation to.
// .SECTION Caveats
// This filter is very inefficient if the output X dimension is 1.
// .SECTION see also
// vtkAbstractTransform vtkMatrix4x4


#ifndef __vtkImageReslice_h
#define __vtkImageReslice_h


#include "vtkImageToImageFilter.h"

// interpolation mode constants
#define VTK_RESLICE_NEAREST 0
#define VTK_RESLICE_LINEAR 1
#define VTK_RESLICE_CUBIC 3

class vtkImageData;
class vtkAbstractTransform;
class vtkMatrix4x4;
class vtkImageStencilData;

class VTK_IMAGING_EXPORT vtkImageReslice : public vtkImageToImageFilter
{
public:
  static vtkImageReslice *New();
  vtkTypeRevisionMacro(vtkImageReslice, vtkImageToImageFilter);

  virtual void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // This method is used to set up the axes for the output voxels.
  // The output Spacing, Origin, and Extent specify the locations
  // of the voxels within the coordinate system defined by the axes.
  // The ResliceAxes are used most often to permute the data, e.g.
  // to extract ZY or XZ slices of a volume as 2D XY images.
  // <p>The first column of the matrix specifies the x-axis 
  // vector (the fourth element must be set to zero), the second
  // column specifies the y-axis, and the third column the
  // z-axis.  The fourth column is the origin of the
  // axes (the fourth element must be set to one).  
  // <p>An alternative to SetResliceAxes() is to use 
  // SetResliceAxesDirectionCosines() to set the directions of the
  // axes and SetResliceAxesOrigin() to set the origin of the axes.
  virtual void SetResliceAxes(vtkMatrix4x4*);
  vtkGetObjectMacro(ResliceAxes, vtkMatrix4x4);

  // Description:
  // Specify the direction cosines for the ResliceAxes (i.e. the
  // first three elements of each of the first three columns of 
  // the ResliceAxes matrix).  This will modify the current
  // ResliceAxes matrix, or create a new matrix if none exists.
  void SetResliceAxesDirectionCosines(double x0, double x1, double x2,
                                      double y0, double y1, double y2,
                                      double z0, double z1, double z2);
  void SetResliceAxesDirectionCosines(const double x[3],
                                      const double y[3],
                                      const double z[3]) {
    this->SetResliceAxesDirectionCosines(x[0], x[1], x[2],
                                         y[0], y[1], y[2],
                                         z[0], z[1], z[2]); };
  void SetResliceAxesDirectionCosines(const double xyz[9]) {
    this->SetResliceAxesDirectionCosines(xyz[0], xyz[1], xyz[2],
                                         xyz[3], xyz[4], xyz[5],
                                         xyz[6], xyz[7], xyz[8]); };
  void GetResliceAxesDirectionCosines(double x[3], double y[3], double z[3]);
  void GetResliceAxesDirectionCosines(double xyz[9]) {
    this->GetResliceAxesDirectionCosines(&xyz[0], &xyz[3], &xyz[6]); };
  double *GetResliceAxesDirectionCosines() {
    this->GetResliceAxesDirectionCosines(this->ResliceAxesDirectionCosines);
    return this->ResliceAxesDirectionCosines; };

  // Description:
  // Specify the origin for the ResliceAxes (i.e. the first three
  // elements of the final column of the ResliceAxes matrix).
  // This will modify the current ResliceAxes matrix, or create
  // new matrix if none exists.
  void SetResliceAxesOrigin(double x, double y, double z);
  void SetResliceAxesOrigin(const double xyz[3]) {
    this->SetResliceAxesOrigin(xyz[0], xyz[1], xyz[2]); };
  void GetResliceAxesOrigin(double xyz[3]);
  double *GetResliceAxesOrigin() {
    this->GetResliceAxesOrigin(this->ResliceAxesOrigin);
    return this->ResliceAxesOrigin; };

  // Description:
  // Set a transform to be applied to the resampling grid that has
  // been defined via the ResliceAxes and the output Origin, Spacing
  // and Extent.  Note that applying a transform to the resampling
  // grid (which lies in the output coordinate system) is
  // equivalent to applying the inverse of that transform to
  // the input volume.  Nonlinear transforms such as vtkGridTransform
  // and vtkThinPlateSplineTransform can be used here.
  virtual void SetResliceTransform(vtkAbstractTransform*);
  vtkGetObjectMacro(ResliceTransform, vtkAbstractTransform);

  // Description:
  // Set a vtkImageData from which the default Spacing, Origin,
  // and WholeExtent of the output will be copied.  The spacing,
  // origin, and extent will be permuted according to the 
  // ResliceAxes.  Any values set via SetOutputSpacing, 
  // SetOutputOrigin, and SetOutputExtent will override these
  // values.  By default, the Spacing, Origin, and WholeExtent
  // of the Input are used.
  virtual void SetInformationInput(vtkImageData*);
  vtkGetObjectMacro(InformationInput, vtkImageData);

  // Description:
  // Specify whether to transform the spacing, origin and extent
  // of the Input (or the InformationInput) according to the
  // direction cosines and origin of the ResliceAxes before applying
  // them as the default output spacing, origin and extent. 
  // Default: On.
  vtkSetMacro(TransformInputSampling, int);
  vtkBooleanMacro(TransformInputSampling, int);
  vtkGetMacro(TransformInputSampling, int);

  // Description:
  // Turn this on if you want to guarantee that the extent of the
  // output will be large enough to ensure that none of the 
  // data will be cropped.
  vtkSetMacro(AutoCropOutput, int);
  vtkBooleanMacro(AutoCropOutput, int);
  vtkGetMacro(AutoCropOutput, int);

  // Description:
  // Turn on wrap-pad feature (default: off). 
  vtkSetMacro(Wrap, int);
  vtkGetMacro(Wrap, int);
  vtkBooleanMacro(Wrap, int);

  // Description:
  // Turn on mirror-pad feature (default: off). 
  // This will override the wrap-pad.
  vtkSetMacro(Mirror, int);
  vtkGetMacro(Mirror, int);
  vtkBooleanMacro(Mirror, int);

  // Description:
  // Set interpolation mode (default: nearest neighbor). 
  vtkSetMacro(InterpolationMode, int);
  vtkGetMacro(InterpolationMode, int);
  void SetInterpolationModeToNearestNeighbor() {
    this->SetInterpolationMode(VTK_RESLICE_NEAREST); };
  void SetInterpolationModeToLinear() {
    this->SetInterpolationMode(VTK_RESLICE_LINEAR); };
  void SetInterpolationModeToCubic() {
    this->SetInterpolationMode(VTK_RESLICE_CUBIC); };
  const char *GetInterpolationModeAsString();

  // Description:
  // Turn on and off optimizations (default on, they should only be
  // turned off for testing purposes). 
  vtkSetMacro(Optimization, int);
  vtkGetMacro(Optimization, int);
  vtkBooleanMacro(Optimization, int);

  // Description:
  // Set the background color (for multi-component images).
  vtkSetVector4Macro(BackgroundColor, float);
  vtkGetVector4Macro(BackgroundColor, float);

  // Description:
  // Set background grey level (for single-component images).
  void SetBackgroundLevel(float v) { this->SetBackgroundColor(v,v,v,v); };
  float GetBackgroundLevel() { return this->GetBackgroundColor()[0]; };

  // Description:
  // Set the voxel spacing for the output data.  The default output
  // spacing is the input spacing permuted through the ResliceAxes.
  vtkSetVector3Macro(OutputSpacing, float);
  vtkGetVector3Macro(OutputSpacing, float);
  void SetOutputSpacingToDefault() {
    this->SetOutputSpacing(VTK_FLOAT_MAX, VTK_FLOAT_MAX, VTK_FLOAT_MAX); };

  // Description:
  // Set the origin for the output data.  The default output origin
  // is the input origin permuted through the ResliceAxes.
  vtkSetVector3Macro(OutputOrigin, float);
  vtkGetVector3Macro(OutputOrigin, float);
  void SetOutputOriginToDefault() {
    this->SetOutputOrigin(VTK_FLOAT_MAX, VTK_FLOAT_MAX, VTK_FLOAT_MAX); };

  // Description:
  // Set the extent for the output data.  The default output extent
  // is the input extent permuted through the ResliceAxes.
  vtkSetVector6Macro(OutputExtent, int);
  vtkGetVector6Macro(OutputExtent, int);
  void SetOutputExtentToDefault() {
    this->SetOutputExtent(VTK_INT_MIN, VTK_INT_MAX,
                          VTK_INT_MIN, VTK_INT_MAX,
                          VTK_INT_MIN, VTK_INT_MAX); };

  // Description:
  // Force the dimensionality of the output to either 1, 2,
  // 3 or 0 (default: 3).  If the dimensionality is 2D, then
  // the Z extent of the output is forced to (0,0) and the Z
  // origin of the output is forced to 0.0 (i.e. the output
  // extent is confined to the xy plane).  If the dimensionality
  // is 1D, the output extent is confined to the x axis.  
  // For 0D, the output extent consists of a single voxel at 
  // (0,0,0).  
  vtkSetMacro(OutputDimensionality, int);
  vtkGetMacro(OutputDimensionality, int);

  // Description:
  // When determining the modified time of the filter, 
  // this check the modified time of the transform and matrix.
  unsigned long int GetMTime();

  // Description:
  // Convenient methods for switching between nearest-neighbor and linear
  // interpolation.  
  // InterpolateOn() is equivalent to SetInterpolationModeToLinear() and
  // InterpolateOff() is equivalent to SetInterpolationModeToNearestNeighbor().
  // You should not use these methods if you use the SetInterpolationMode
  // methods.
  void SetInterpolate(int t) {
    if (t && !this->GetInterpolate()) {
      this->SetInterpolationModeToLinear(); }
    else if (!t && this->GetInterpolate()) {
      this->SetInterpolationModeToNearestNeighbor(); } };
  void InterpolateOn() {
    this->SetInterpolate(1); };
  void InterpolateOff() {
    this->SetInterpolate(0); };
  int GetInterpolate() {
    return (this->GetInterpolationMode() != VTK_RESLICE_NEAREST); };

  // Description:
  // Use a stencil to limit the calculations to a specific region of
  // the output.  Portions of the output that are 'outside' the stencil
  // will be cleared to the background color.  
  void SetStencil(vtkImageStencilData *stencil);
  vtkImageStencilData *GetStencil();

protected:
  vtkImageReslice();
  ~vtkImageReslice();

  vtkMatrix4x4 *ResliceAxes;
  double ResliceAxesDirectionCosines[9];
  double ResliceAxesOrigin[3];
  vtkAbstractTransform *ResliceTransform;
  vtkImageData *InformationInput;
  int Wrap;
  int Mirror;
  int InterpolationMode;
  int Optimization;
  float BackgroundColor[4];
  float OutputOrigin[3];
  float OutputSpacing[3];
  int OutputExtent[6];
  int OutputDimensionality;
  int TransformInputSampling;
  int AutoCropOutput;

  vtkMatrix4x4 *IndexMatrix;
  vtkAbstractTransform *OptimizedTransform;

  void GetAutoCroppedOutputBounds(vtkImageData *input, float bounds[6]);
  void ExecuteInformation(vtkImageData *input, vtkImageData *output);
  void ExecuteInformation();
  void ComputeInputUpdateExtents(vtkDataObject *output);
  void ComputeInputUpdateExtent(int inExt[6], int outExt[6]);
  void ThreadedExecute(vtkImageData *inData, vtkImageData *outData, 
                       int ext[6], int id);

  vtkMatrix4x4 *GetIndexMatrix();
  vtkAbstractTransform *GetOptimizedTransform() { 
    return this->OptimizedTransform; };
  void OptimizedComputeInputUpdateExtent(int inExt[6], int outExt[6]);
  void OptimizedThreadedExecute(vtkImageData *inData, vtkImageData *outData, 
                                int ext[6], int id);
private:
  vtkImageReslice(const vtkImageReslice&);  // Not implemented.
  void operator=(const vtkImageReslice&);  // Not implemented.
};

//----------------------------------------------------------------------------
inline const char *vtkImageReslice::GetInterpolationModeAsString()
{
  switch (this->InterpolationMode)
    {
    case VTK_RESLICE_NEAREST:
      return "NearestNeighbor";
    case VTK_RESLICE_LINEAR:
      return "Linear";
    case VTK_RESLICE_CUBIC:
      return "Cubic";
    default:
      return "";
    }
}  

#endif





