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/*=========================================================================
Program: Visualization Toolkit
Module: vtkPythonCalculator.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 vtkPythonCalculator
* @brief Evaluates a Python expression
* vtkPythonCalculator uses Python to calculate an expression.
* This filter depends heavily on the numpy and paraview.vtk modules.
* To use the parallel functions, mpi4py is also necessary. The expression
* is evaluated and the resulting scalar value or numpy array is added
* to the output as an array. See numpy and paraview.vtk documentation
* for the list of available functions.
*
* This filter tries to make it easy for the user to write expressions
* by defining certain variables. The filter tries to assign each array
* to a variable of the same name. If the name of the array is not a
* valid Python variable, it has to be accessed through a dictionary called
* arrays (i.e. arrays['array_name']). The points can be accessed using the
* points variable.
*/
#ifndef vtkPythonCalculator_h
#define vtkPythonCalculator_h
#include "vtkPVClientServerCoreDefaultModule.h" //needed for exports
#include "vtkProgrammableFilter.h"
class VTKPVCLIENTSERVERCOREDEFAULT_EXPORT vtkPythonCalculator : public vtkProgrammableFilter
{
public:
vtkTypeMacro(vtkPythonCalculator, vtkProgrammableFilter);
void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
static vtkPythonCalculator* New();
//@{
/**
* Which field data to get the arrays from. See
* vtkDataObject::FieldAssociations for choices. The default
* is FIELD_ASSOCIATION_POINTS.
*/
vtkSetMacro(ArrayAssociation, int);
vtkGetMacro(ArrayAssociation, int);
//@}
//@{
/**
* Set the text of the python expression to execute. This expression
* must return a scalar value (which is converted to an array) or a
* numpy array.
*/
vtkSetStringMacro(Expression) vtkGetStringMacro(Expression)
//@}
//@{
/**
* Set the name of the output array.
*/
vtkSetStringMacro(ArrayName) vtkGetStringMacro(ArrayName)
//@}
/**
* For internal use only.
*/
static void ExecuteScript(void*);
protected:
vtkPythonCalculator();
~vtkPythonCalculator();
/**
* For internal use only.
*/
void Exec(const char*);
virtual int FillOutputPortInformation(int port, vtkInformation* info) VTK_OVERRIDE;
// overridden to allow multiple inputs to port 0
virtual int FillInputPortInformation(int port, vtkInformation* info) VTK_OVERRIDE;
// DeExpressionion:
// Creates whatever output data set type is selected.
virtual int RequestDataObject(vtkInformation* request, vtkInformationVector** inputVector,
vtkInformationVector* outputVector) VTK_OVERRIDE;
char* Expression;
char* ArrayName;
int ArrayAssociation;
private:
vtkPythonCalculator(const vtkPythonCalculator&) VTK_DELETE_FUNCTION;
void operator=(const vtkPythonCalculator&) VTK_DELETE_FUNCTION;
};
#endif
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