paraview-dev 5.1.2+dfsg1-2 / usr / include / paraview / vtkPlotHistogram2D.h

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

  Program:   Visualization Toolkit
  Module:    vtk2DHistogramItem.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 vtk2DHistogramItem - 2D histogram item.
//
// .SECTION Description
//

#ifndef vtkPlotHistogram2D_h
#define vtkPlotHistogram2D_h

#include "vtkChartsCoreModule.h" // For export macro
#include "vtkPlot.h"
#include "vtkSmartPointer.h"  // Needed for SP ivars
#include "vtkRect.h"          // Needed for vtkRectf

class vtkImageData;
class vtkScalarsToColors;

class VTKCHARTSCORE_EXPORT vtkPlotHistogram2D : public vtkPlot
{
public:
  vtkTypeMacro(vtkPlotHistogram2D, vtkPlot);
  virtual void PrintSelf(ostream &os, vtkIndent indent);

  // Description:
  // Creates a new object.
  static vtkPlotHistogram2D *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();

  // Description:
  // Paint event for the item, called whenever it needs to be drawn.
  virtual bool Paint(vtkContext2D *painter);

  // Description:
  // Set the input, we are expecting a vtkImageData with just one component,
  // this would normally be a float or a double. It will be passed to the other
  // functions as a double to generate a color.
  virtual void SetInputData(vtkImageData *data, vtkIdType z = 0);
  virtual void SetInputData(vtkTable*) { }
  virtual void SetInputData(vtkTable*, const vtkStdString&, const vtkStdString&) { }

  // Description:
  // Get the input table used by the plot.
  vtkImageData * GetInputImageData();

  // Description:
  // Set the color transfer function that will be used to generate the 2D
  // histogram.
  void SetTransferFunction(vtkScalarsToColors *transfer);

  // Description:
  // Get the color transfer function that is used to generate the histogram.
  vtkScalarsToColors * GetTransferFunction();

  virtual void GetBounds(double bounds[4]);

  virtual void SetPosition(const vtkRectf& pos);
  virtual vtkRectf GetPosition();

  // Description:
  // Generate and return the tooltip label string for this plot
  // The segmentIndex parameter is ignored.
  // The member variable TooltipLabelFormat can be set as a
  // printf-style string to build custom tooltip labels from,
  // and may contain:
  // An empty string generates the default tooltip labels.
  // The following case-sensitive format tags (without quotes) are recognized:
  //   '%x' The X position of the histogram cell
  //   '%y' The Y position of the histogram cell
  //   '%v' The scalar value of the histogram cell
  //   Note: the %i and %j tags are valid only if there is a 1:1 correspondence
  //         between individual histogram cells and axis tick marks
  //   '%i' The X axis tick label for the histogram cell
  //   '%j' The Y axis tick label for the histogram cell
  // Any other characters or unrecognized format tags are printed in the
  // tooltip label verbatim.
  virtual vtkStdString GetTooltipLabel(const vtkVector2d &plotPos,
                                       vtkIdType seriesIndex,
                                       vtkIdType segmentIndex);

  // Description:
  // Function to query a plot for the nearest point to the specified coordinate.
  // Returns an index between 0 and (number of histogram cells - 1), or -1.
  // The index 0 is at cell x=0, y=0 of the histogram, and the index increases
  // in a minor fashon with x and in a major fashon with y.
  // The referent of "location" is set to the x and y integer indices of the
  // histogram cell.
  virtual vtkIdType GetNearestPoint(const vtkVector2f& point,
                                    const vtkVector2f& tolerance,
                                    vtkVector2f* location);

protected:
  vtkPlotHistogram2D();
  ~vtkPlotHistogram2D();

  // Description:
  // Where all the magic happens...
  void GenerateHistogram();

  vtkSmartPointer<vtkImageData> Input;
  vtkSmartPointer<vtkImageData> Output;
  vtkSmartPointer<vtkScalarsToColors> TransferFunction;
  vtkRectf Position;

private:
  vtkPlotHistogram2D(const vtkPlotHistogram2D &); // Not implemented.
  void operator=(const vtkPlotHistogram2D &); // Not implemented.

};

#endif //vtkPlotHistogram2D_h

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