dox/Filtering/vtkPointsProjectedHull.h

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

  Program:   Visualization Toolkit
  Module:    vtkPointsProjectedHull.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 (c) Sandia Corporation
 See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.
----------------------------------------------------------------------------*/

#ifndef __vtkPointsProjectedHull_h
#define __vtkPointsProjectedHull_h

#include "vtkPoints.h"

class VTK_FILTERING_EXPORT vtkPointsProjectedHull : public vtkPoints
{
    vtkTypeMacro(vtkPointsProjectedHull, vtkPoints);

public:
    void PrintSelf(ostream& os, vtkIndent indent);

    static vtkPointsProjectedHull *New();

    int RectangleIntersectionX(vtkPoints *R);

    int RectangleIntersectionX(float ymin, float ymax, float zmin, float zmax);
    int RectangleIntersectionX(double ymin, double ymax, double zmin, double zmax);

    int RectangleIntersectionY(vtkPoints *R);

    int RectangleIntersectionY(float zmin, float zmax, float xmin, float xmax);
    int RectangleIntersectionY(double zmin, double zmax, double xmin, double xmax);

    int RectangleIntersectionZ(vtkPoints *R);

    int RectangleIntersectionZ(float xmin, float xmax, float ymin, float ymax);
    int RectangleIntersectionZ(double xmin, double xmax, double ymin, double ymax);

    int GetCCWHullX(float *pts, int len);
    int GetCCWHullX(double *pts, int len);

    int GetCCWHullY(float *pts, int len);
    int GetCCWHullY(double *pts, int len);

    int GetCCWHullZ(float *pts, int len);
    int GetCCWHullZ(double *pts, int len);

    int GetSizeCCWHullX();

    int GetSizeCCWHullY();

    int GetSizeCCWHullZ();

    void Initialize();
    void Reset(){this->Initialize();}

    void Update();

protected:

    vtkPointsProjectedHull();
    ~vtkPointsProjectedHull();

private:

  int RectangleIntersection(double hmin, double hmax,
                            double vmin, double vmax, int direction);
  int GrahamScanAlgorithm(int direction);
  void GetPoints();
  int RectangleBoundingBoxIntersection(double hmin, double hmax,
                            double vmin, double vmax, int direction);
  int RectangleOutside(double hmin, double hmax,
                            double vmin, double vmax, int direction);

  int RectangleOutside1DPolygon(double hmin, double hmax,
                            double vmin, double vmax, int dir);

  void InitFlags();
  void ClearAllocations();


  static int RemoveExtras(double *pts, int n);
  static double Distance(double *p1, double *p2);
  static int PositionInHull(double *base, double *top, double *pt);
  static int OutsideLine(double hmin, double hmax,
           double vmin, double vmax, double *p0, double *p1, double *insidePt);
  static int OutsideHorizontalLine(double vmin, double vmax, 
           double *p0, double *p1, double *insidePt);
  static int OutsideVerticalLine(double hmin, double hmax, double *p0, 
           double *p1, double *insidePt);

  double *Pts;
  int Npts;
  vtkTimeStamp PtsTime;

  double *CCWHull[3];
  float HullBBox[3][4];
  int HullSize[3];
  vtkTimeStamp HullTime[3];

  vtkPointsProjectedHull(const vtkPointsProjectedHull&); // Not implemented
  void operator=(const vtkPointsProjectedHull&); // Not implemented
};
#endif