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

 Program:   Visualization Toolkit
 Module:    vtkCirclePackLayoutStrategy.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.
 -------------------------------------------------------------------------*/
// .NAME vtkCirclePackLayoutStrategy - abstract superclass for all circle packing
// layout strategies.
//
// .SECTION Description
// All subclasses of this class perform a circle packing layout on a vtkTree.
// This involves assigning a circle to each vertex in the tree,
// and placing that information in a data array with three components per
// tuple representing (Xcenter, Ycenter, Radius).
//
// Instances of subclasses of this class may be assigned as the layout
// strategy to vtkCirclePackLayout
//
// .SECTION Thanks
// Thanks to Thomas Otahal from Sandia National Laboratories
// for help developing this class.

#ifndef __vtkCirclePackLayoutStrategy_h
#define __vtkCirclePackLayoutStrategy_h


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

class vtkTree;
class vtkDataArray;

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

    // Description:
    // Perform the layout of the input tree, and store the circle
    // bounds of each vertex as a tuple in a data array.
    // (Xcenter, Ycenter, Radius).
    //
    // The sizeArray may be NULL, or may contain the desired
    // size of each vertex in the tree.
    virtual void Layout(vtkTree *inputTree, vtkDataArray *areaArray,
                        vtkDataArray* sizeArray) = 0;

protected:
    vtkCirclePackLayoutStrategy();
    ~vtkCirclePackLayoutStrategy();

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

#endif
