/usr/include/vtk-5.8/vtkChartHistogram2D.h is in libvtk5-dev 5.8.0-17.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | /*=========================================================================
  Program:   Visualization Toolkit
  Module:    vtkChart2DHistogram.h
  Copyright (c) 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 vtkChart2DHistogram - Chart for 2D histograms.
//
// .SECTION Description
// This defines the interface for a 2D histogram chart.
#ifndef __vtkChart2DHistogram_h
#define __vtkChart2DHistogram_h
#include "vtkChartXY.h"
#include "vtkSmartPointer.h" // For SP ivars
class vtkColorLegend;
class vtkPlotHistogram2D;
class vtkImageData;
class vtkScalarsToColors;
class VTK_CHARTS_EXPORT vtkChartHistogram2D : public vtkChartXY
{
public:
  vtkTypeMacro(vtkChartHistogram2D, vtkChartXY);
  virtual void PrintSelf(ostream &os, vtkIndent indent);
  // Description:
  // Creates a 2D histogram chart
  static vtkChartHistogram2D* New();
  // Description:
  // Perform any updates to the item that may be necessary before rendering.
  // The scene should take care of calling this on all items before their
  // Paint function is invoked.
  virtual void Update();
  virtual void SetInput(vtkImageData *data, vtkIdType z = 0);
  virtual void SetTransferFunction(vtkScalarsToColors *function);
  // Description:
  // Return true if the supplied x, y coordinate is inside the item.
  virtual bool Hit(const vtkContextMouseEvent &mouse);
protected:
  vtkChartHistogram2D();
  ~vtkChartHistogram2D();
  vtkSmartPointer<vtkPlotHistogram2D> Histogram;
  // Description:
  // The point cache is marked dirty until it has been initialized.
  vtkTimeStamp BuildTime;
  class Private;
  Private* Storage;
  virtual bool UpdateLayout(vtkContext2D *painter);
private:
  vtkChartHistogram2D(const vtkChartHistogram2D &); // Not implemented.
  void operator=(const vtkChartHistogram2D &);   // Not implemented.
};
#endif //__vtkChart2DHistogram_h
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