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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.
=========================================================================*/
// .NAME vtkPythonCalculator - 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);
static vtkPythonCalculator *New();
// Description:
// 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);
// Description:
// Controls whether the input arrays are copied to the output.
// True by default.
vtkSetMacro(CopyArrays, bool);
vtkGetMacro(CopyArrays, bool);
vtkBooleanMacro(CopyArrays, bool);
// Description:
// 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)
// Description:
// Set the name of the output array.
vtkSetStringMacro(ArrayName)
vtkGetStringMacro(ArrayName)
// Description:
// For internal use only.
static void ExecuteScript(void *);
protected:
vtkPythonCalculator();
~vtkPythonCalculator();
// Description:
// For internal use only.
void Exec(const char*);
virtual int FillOutputPortInformation(int port, vtkInformation* info);
//overridden to allow multiple inputs to port 0
virtual int FillInputPortInformation(int port, vtkInformation *info);
// DeExpressionion:
// Creates whatever output data set type is selected.
virtual int RequestDataObject(vtkInformation* request,
vtkInformationVector** inputVector,
vtkInformationVector* outputVector);
char *Expression;
char *ArrayName;
int ArrayAssociation;
bool CopyArrays;
private:
vtkPythonCalculator(const vtkPythonCalculator&); // Not implemented.
void operator=(const vtkPythonCalculator&); // Not implemented.
};
#endif
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