nmWTAI-Platform/3rd/VTK7.1/include/vtkPointsProjectedHull.h

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

  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.
----------------------------------------------------------------------------*/

/**
 * @class   vtkPointsProjectedHull
 * @brief   the convex hull of the orthogonal
 *    projection of the vtkPoints in the 3 coordinate directions
 *
 *    a subclass of vtkPoints, it maintains the counter clockwise
 *    convex hull of the points (projected orthogonally in the
 *    three coordinate directions) and has a method to
 *    test for intersection of that hull with an axis aligned
 *    rectangle.  This is used for intersection tests of 3D volumes.
*/

#ifndef vtkPointsProjectedHull_h
#define vtkPointsProjectedHull_h

#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkPoints.h"

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

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

    static vtkPointsProjectedHull *New();

    /**
     * determine whether the resulting rectangle intersects the
     * convex hull of the projection of the points along that axis.
     */

    int RectangleIntersectionX(vtkPoints *R);

    /**
     * the convex hull of the projection of the points along the
     * positive X-axis.
     */

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

    /**
     * of the parallel projection along the Y axis of the points
     */

    int RectangleIntersectionY(vtkPoints *R);

    /**
     * the convex hull of the projection of the points along the
     * positive Y-axis.
     */

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

    /**
     * of the parallel projection along the Z axis of the points
     */

    int RectangleIntersectionZ(vtkPoints *R);

    /**
     * the convex hull of the projection of the points along the
     * positive Z-axis.
     */

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

    /**
     * Returns the coordinates (y,z) of the points in the convex hull
     * of the projection of the points down the positive x-axis.  pts has
     * storage for len*2 values.
     */

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

    /**
     * Returns the coordinates (z, x) of the points in the convex hull
     * of the projection of the points down the positive y-axis.  pts has
     * storage for len*2 values.
     */

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

    /**
     * Returns the coordinates (x, y) of the points in the convex hull
     * of the projection of the points down the positive z-axis.  pts has
     * storage for len*2 values.
     */

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

    /**
     * Returns the number of points in the convex hull of the projection
     * of the points down the positive x-axis
     */

    int GetSizeCCWHullX();

    /**
     * Returns the number of points in the convex hull of the projection
     * of the points down the positive y-axis
     */

    int GetSizeCCWHullY();

    /**
     * Returns the number of points in the convex hull of the projection
     * of the points down the positive z-axis
     */

    int GetSizeCCWHullZ();

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

    /**
     * Forces recalculation of convex hulls, use this if
     * you delete/add points
     */

    void Update();

protected:

    vtkPointsProjectedHull();
    ~vtkPointsProjectedHull() VTK_OVERRIDE;

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&) VTK_DELETE_FUNCTION;
  void operator=(const vtkPointsProjectedHull&) VTK_DELETE_FUNCTION;
};
#endif