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92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkFindCellStrategy.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkFindCellStrategy
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* @brief helper class to manage the vtkPointSet::FindCell() METHOD
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*
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* vtkFindCellStrategy is a helper class to manage the use of locators for
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* locating cells containing a query point x[3], the so-called FindCell()
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* method. The use of vtkDataSet::FindCell() is a common operation in
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* applications such as streamline generation and probing. However, in some
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* dataset types FindCell() can be implemented very simply (e.g.,
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* vtkImageData) while in other datasets it is a complex operation requiring
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* supplemental objects like locators to perform efficiently. In particular,
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* vtkPointSet and its subclasses (like vtkUnstructuredGrid) require complex
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* strategies to efficiently implement the FindCell() operation. Subclasses
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* of the abstract vtkFindCellStrategy implement several of these strategies.
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*
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* The are two key methods to this class and subclasses. The Initialize()
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* method negotiates with an input dataset to define the locator to use:
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* either a locator associated with the inout dataset, or possibly an
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* alternative locator defined by the strategy (subclasses do this). The
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* second important method, FindCell() mimics vtkDataSet::FindCell() and
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* can be used in place of it.
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*
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* @sa
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* vtkPointSet vtkPolyData vtkStructuredGrid vtkUnstructuredGrid
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*/
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#ifndef vtkFindCellStrategy_h
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#define vtkFindCellStrategy_h
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#include "vtkCommonDataModelModule.h" // For export macro
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#include "vtkObject.h"
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class vtkCell;
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class vtkGenericCell;
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class vtkPointSet;
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class VTKCOMMONDATAMODEL_EXPORT vtkFindCellStrategy : public vtkObject
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{
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public:
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//@{
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/**
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* Standard methdos for type information and printing.
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*/
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vtkTypeMacro(vtkFindCellStrategy, vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@}
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/**
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* All subclasses of this class must provide an initialize method. This
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* method performs handshaking and setup between the vtkPointSet dataset
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* and associated locator(s). A return value==0 means the initialization
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* process failed.
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*/
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virtual int Initialize(vtkPointSet* ps);
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/**
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* Virtual method for finding a cell. Subclasses must satisfy this API.
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* This method is of the same signature as vtkDataSet::FindCell().
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*/
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virtual vtkIdType FindCell(double x[3], vtkCell* cell, vtkGenericCell* gencell, vtkIdType cellId,
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double tol2, int& subId, double pcoords[3], double* weights) = 0;
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protected:
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vtkFindCellStrategy();
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~vtkFindCellStrategy() override;
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vtkPointSet* PointSet; // vtkPointSet which this strategy is associated with
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double Bounds[6]; // bounding box of vtkPointSet
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vtkTimeStamp InitializeTime; // time at which strategy was initialized
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private:
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vtkFindCellStrategy(const vtkFindCellStrategy&) = delete;
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void operator=(const vtkFindCellStrategy&) = delete;
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};
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#endif
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