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

  Program:   Visualization Toolkit
  Module:    vtkCompositeTransferFunctionItem.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.

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

#ifndef vtkCompositeTransferFunctionItem_h
#define vtkCompositeTransferFunctionItem_h

#include "vtkChartsCoreModule.h" // For export macro
#include "vtkColorTransferFunctionItem.h"

class vtkPiecewiseFunction;

// Description:
// vtkPlot::Color and vtkPlot::Brush have no effect here.
class VTKCHARTSCORE_EXPORT vtkCompositeTransferFunctionItem: public vtkColorTransferFunctionItem
{
public:
  static vtkCompositeTransferFunctionItem* New();
  vtkTypeMacro(vtkCompositeTransferFunctionItem, vtkColorTransferFunctionItem);
  virtual void PrintSelf(ostream &os, vtkIndent indent);

  void SetOpacityFunction(vtkPiecewiseFunction* opacity);
  vtkGetObjectMacro(OpacityFunction, vtkPiecewiseFunction);

protected:
  vtkCompositeTransferFunctionItem();
  virtual ~vtkCompositeTransferFunctionItem();

  // Description:
  // Returns true if we are rendering in log space.
  // Since vtkPiecewiseFunction doesn't support log, we show this transfer
  // function in non-log space always.
  virtual bool UsingLogScale() { return false; }

  // Description:
  // Reimplemented to return the range of the piecewise function
  virtual void ComputeBounds(double bounds[4]);

  virtual void ComputeTexture();
  vtkPiecewiseFunction* OpacityFunction;

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

#endif