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/*=========================================================================
Program: Visualization Toolkit
Module: vtkFindCellStrategy.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.
=========================================================================*/
/**
* @class vtkFindCellStrategy
* @brief helper class to manage the vtkPointSet::FindCell() METHOD
*
* vtkFindCellStrategy is a helper class to manage the use of locators for
* locating cells containing a query point x[3], the so-called FindCell()
* method. The use of vtkDataSet::FindCell() is a common operation in
* applications such as streamline generation and probing. However, in some
* dataset types FindCell() can be implemented very simply (e.g.,
* vtkImageData) while in other datasets it is a complex operation requiring
* supplemental objects like locators to perform efficiently. In particular,
* vtkPointSet and its subclasses (like vtkUnstructuredGrid) require complex
* strategies to efficiently implement the FindCell() operation. Subclasses
* of the abstract vtkFindCellStrategy implement several of these strategies.
*
* The are two key methods to this class and subclasses. The Initialize()
* method negotiates with an input dataset to define the locator to use:
* either a locator associated with the inout dataset, or possibly an
* alternative locator defined by the strategy (subclasses do this). The
* second important method, FindCell() mimics vtkDataSet::FindCell() and
* can be used in place of it.
*
* @sa
* vtkPointSet vtkPolyData vtkStructuredGrid vtkUnstructuredGrid
*/
#ifndef vtkFindCellStrategy_h
#define vtkFindCellStrategy_h
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkObject.h"
class vtkCell;
class vtkGenericCell;
class vtkPointSet;
class VTKCOMMONDATAMODEL_EXPORT vtkFindCellStrategy : public vtkObject
{
public:
//@{
/**
* Standard methdos for type information and printing.
*/
vtkTypeMacro(vtkFindCellStrategy, vtkObject);
void PrintSelf(ostream& os, vtkIndent indent) override;
//@}
/**
* All subclasses of this class must provide an initialize method. This
* method performs handshaking and setup between the vtkPointSet dataset
* and associated locator(s). A return value==0 means the initialization
* process failed.
*/
virtual int Initialize(vtkPointSet* ps);
/**
* Virtual method for finding a cell. Subclasses must satisfy this API.
* This method is of the same signature as vtkDataSet::FindCell().
*/
virtual vtkIdType FindCell(double x[3], vtkCell* cell, vtkGenericCell* gencell, vtkIdType cellId,
double tol2, int& subId, double pcoords[3], double* weights) = 0;
protected:
vtkFindCellStrategy();
~vtkFindCellStrategy() override;
vtkPointSet* PointSet; // vtkPointSet which this strategy is associated with
double Bounds[6]; // bounding box of vtkPointSet
vtkTimeStamp InitializeTime; // time at which strategy was initialized
private:
vtkFindCellStrategy(const vtkFindCellStrategy&) = delete;
void operator=(const vtkFindCellStrategy&) = delete;
};
#endif
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