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/*=========================================================================
Program: Visualization Toolkit
Module: vtkGraphAnnotationLayersFilter.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 vtkGraphAnnotationLayersFilter - Produce filled convex hulls around
// subsets of vertices in a vtkGraph.
//
// .SECTION Description
// Produces a vtkPolyData comprised of filled polygons of the convex hull
// of a cluster. Alternatively, you may choose to output bounding rectangles.
// Clusters with fewer than three vertices are artificially expanded to
// ensure visibility (see vtkConvexHull2D).
//
// The first input is a vtkGraph with points, possibly set by
// passing the graph through vtkGraphLayout (z-values are ignored). The second
// input is a vtkAnnotationsLayer containing vtkSelectionNodeS of vertex
// ids (the 'clusters' output of vtkTulipReader for example).
//
// Setting OutlineOn() additionally produces outlines of the clusters on
// output port 1.
//
// Three arrays are added to the cells of the output: "Hull id"; "Hull name";
// and "Hull color".
//
// Note: This filter operates in the x,y-plane and as such works best with an
// interactor style that does not allow camera rotation, such as
// vtkInteractorStyleRubberBand2D.
//
// .SECTION See also
// vtkContext2D
//
// .SECTION Thanks
// Thanks to Colin Myers, University of Leeds for providing this implementation.
#ifndef vtkGraphAnnotationLayersFilter_h
#define vtkGraphAnnotationLayersFilter_h
#include "vtkRenderingAnnotationModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"
#include "vtkSmartPointer.h" // needed for ivars
class vtkAppendPolyData;
class vtkConvexHull2D;
class vtkRenderer;
class VTKRENDERINGANNOTATION_EXPORT vtkGraphAnnotationLayersFilter: public vtkPolyDataAlgorithm
{
public:
static vtkGraphAnnotationLayersFilter *New();
vtkTypeMacro(vtkGraphAnnotationLayersFilter, vtkPolyDataAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Produce outlines of the hulls on output port 1.
void OutlineOn();
void OutlineOff();
void SetOutline(bool b);
// Description:
// Scale each hull by the amount specified. Defaults to 1.0.
void SetScaleFactor(double scale);
// Description:
// Set the shape of the hulls to bounding rectangle.
void SetHullShapeToBoundingRectangle();
// Description:
// Set the shape of the hulls to convex hull. Default.
void SetHullShapeToConvexHull();
// Description:
// Set the minimum x,y-dimensions of each hull in world coordinates. Defaults
// to 1.0. Set to 0.0 to disable.
void SetMinHullSizeInWorld(double size);
// Description:
// Set the minimum x,y-dimensions of each hull in pixels. You must also set a
// vtkRenderer. Defaults to 1. Set to 0 to disable.
void SetMinHullSizeInDisplay(int size);
// Description:
// Renderer needed for MinHullSizeInDisplay calculation. Not reference counted.
void SetRenderer(vtkRenderer* renderer);
// Description:
// The modified time of this filter.
virtual unsigned long GetMTime();
protected:
vtkGraphAnnotationLayersFilter();
~vtkGraphAnnotationLayersFilter();
// Description:
// This is called by the superclass. This is the method you should override.
int RequestData(vtkInformation *, vtkInformationVector **,
vtkInformationVector *);
// Description:
// Set the input to vtkGraph and vtkAnnotationLayers.
int FillInputPortInformation(int port, vtkInformation* info);
private:
vtkGraphAnnotationLayersFilter(const vtkGraphAnnotationLayersFilter&); // Not implemented.
void operator=(const vtkGraphAnnotationLayersFilter&); // Not implemented.
vtkSmartPointer<vtkAppendPolyData> HullAppend;
vtkSmartPointer<vtkAppendPolyData> OutlineAppend;
vtkSmartPointer<vtkConvexHull2D> ConvexHullFilter;
};
#endif // vtkGraphAnnotationLayersFilter_h
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