vtkAreaLayoutStrategy.h

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

  Program:   Visualization Toolkit
  Module:    vtkAreaLayoutStrategy.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.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
#ifndef vtkAreaLayoutStrategy_h
#define vtkAreaLayoutStrategy_h


#include "vtkInfovisLayoutModule.h" // For export macro
#include "vtkObject.h"

class vtkTree;
class vtkDataArray;

class VTKINFOVISLAYOUT_EXPORT vtkAreaLayoutStrategy : public vtkObject
{
public:
  vtkTypeMacro(vtkAreaLayoutStrategy,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  virtual void Layout(vtkTree *inputTree, vtkDataArray *areaArray,
      vtkDataArray* sizeArray) = 0;

  // Modify edgeLayoutTree to have point locations appropriate
  // for routing edges on a graph overlaid on the tree.
  // Layout() is called before this method, so inputTree will contain the
  // layout locations.
  // If you do not override this method,
  // the edgeLayoutTree vertex locations are the same as the input tree.
  virtual void LayoutEdgePoints(vtkTree *inputTree, vtkDataArray *areaArray,
      vtkDataArray* sizeArray, vtkTree *edgeLayoutTree);

  virtual vtkIdType FindVertex(vtkTree* tree, vtkDataArray* array, float pnt[2]) = 0;

  // Descripiton:
  // The amount that the regions are shrunk as a value from
  // 0.0 (full size) to 1.0 (shrink to nothing).
  vtkSetClampMacro(ShrinkPercentage, double, 0.0, 1.0);
  vtkGetMacro(ShrinkPercentage, double);

protected:
  vtkAreaLayoutStrategy();
  ~vtkAreaLayoutStrategy();

  double ShrinkPercentage;

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

#endif