GUI/Widgets/vtkKWHistogram.h

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

  Module:    $RCSfile: vtkKWHistogram.h,v $

  Copyright (c) Kitware, Inc.
  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.

=========================================================================*/
#ifndef __vtkKWHistogram_h
#define __vtkKWHistogram_h

#include "vtkObject.h"
#include "vtkKWWidgets.h" // Needed for export symbols directives

class vtkColorTransferFunction;
class vtkDataArray;
class vtkImageData;
class vtkDoubleArray;

class KWWIDGETS_EXPORT vtkKWHistogram : public vtkObject
{
public:
  static vtkKWHistogram* New();
  vtkTypeRevisionMacro(vtkKWHistogram,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkGetVector2Macro(Range, double);


  vtkGetObjectMacro(Bins, vtkDoubleArray);

  virtual vtkIdType GetNumberOfBins();


  vtkSetMacro(MaximumNumberOfBins, vtkIdType);
  vtkGetMacro(MaximumNumberOfBins, vtkIdType);


  virtual double GetMinimumOccurence();
  virtual double GetMaximumOccurence();
  virtual double GetTotalOccurence();

  virtual double GetOccurenceAtValue(double value);


  virtual double GetValueAtAccumulatedOccurence(
    double acc, double *exclude_value = 0);

  virtual void BuildHistogram(vtkDataArray *scalars, int component);


  vtkSetVector2Macro(Range, double);


  virtual void EstimateHistogramRange(
    vtkDataArray *scalars, int component, double range[2]);

  virtual void AccumulateHistogram(vtkDataArray *scalars, int component);

  virtual void EmptyHistogram();


  virtual void SetLogMode(int);
  vtkBooleanMacro(LogMode, int);
  vtkGetMacro(LogMode, int);

protected:
  vtkKWHistogram();
  ~vtkKWHistogram();

  double Range[2];

  vtkDoubleArray *Bins;

  vtkImageData *Image;
  unsigned long LastImageBuildTime;
  unsigned long LastTransferFunctionTime;
  int           LogMode;
  vtkIdType     MaximumNumberOfBins;

  virtual void ComputeStatistics();
  unsigned long LastStatisticsBuildTime;

  double MinimumOccurence;
  double MaximumOccurence;
  double TotalOccurence;


  virtual void UpdateHistogram(
    vtkDataArray *scalars, int component, int reset_range);


  virtual void EstimateHistogramRangeAndNumberOfBins(
    vtkDataArray *scalars, int component, 
    double range[2], vtkIdType *nb_of_bins);

public:

  class KWWIDGETS_EXPORT ImageDescriptor
  {
  public:
    ImageDescriptor();

    int  IsValid() const;
    int  IsEqualTo(const ImageDescriptor *desc);
    void Copy(const ImageDescriptor *desc);

    int          DrawBackground;
    int          DrawGrid;
    int          GridSize;

    enum
    {
      StyleBars = 0,
      StyleDots
    };
    int          Style;

    double       Range[2];
    void SetRange(double range0, double range1);
    void SetRange(double range[2]);

    unsigned int Width;
    unsigned int Height;
    void SetDimensions(unsigned int width, unsigned int height);

    double       Color[3];
    void SetColor(double color[3]);

    double       BackgroundColor[3];
    void SetBackgroundColor(double color[3]);

    double       OutOfRangeColor[3];
    void SetOutOfRangeColor(double color[3]);

    double       GridColor[3];
    void SetGridColor(double color[3]);

    vtkColorTransferFunction *ColorTransferFunction;

    // When the histogram is drawn, a resampled version of the histogram
    // is computed where each column-pixel along the Width is a bin.
    // The histogram itself is scaled vertically so that the bin with
    // the maximum occurence occupies the full Height.
    // Each time it occurs, the LastMaximumOccurence ivar is modified
    // to store this maximum occurence.
    // If the DefaultMaximumOccurence is set to something other than 0.0
    // it will override the maximum occurence found so far and be used
    // to scale the histogram vertically (of course, it has to be >=
    // to the current maximum occurence).
    // Using DefaultMaximumOccurence is right now the way to have two
    // histograms being scaled the same way, under some constraints.

    double       DefaultMaximumOccurence;
    double       LastMaximumOccurence;
  };
  // @endcond
  virtual int IsImageUpToDate(const ImageDescriptor *desc = 0);
  virtual vtkImageData* GetImage(ImageDescriptor *desc);
  //ETX
  
protected:
  //BTX
  vtkKWHistogram::ImageDescriptor *LastImageDescriptor;
  //ETX

private:
  vtkKWHistogram(const vtkKWHistogram&); // Not implemented
  void operator=(const vtkKWHistogram&); // Not implemented
};

#endif

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