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77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
3 weeks ago
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#ifndef vtkKMeansDistanceFunctorCalculator_h
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#define vtkKMeansDistanceFunctorCalculator_h
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/**
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* @class vtkKMeansDistanceFunctorCalculator
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* @brief measure distance from k-means cluster centers using a user-specified expression
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*
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* This is a subclass of the default k-means distance functor that allows
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* the user to specify a distance function as a string. The provided
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* expression is evaluated whenever the parenthesis operator is invoked
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* but this is much slower than the default distance calculation.
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*
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* User-specified distance expressions should be written in terms of
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* two vector variables named "x" and "y".
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* The length of the vectors will be determined by the k-means request
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* and all columns of interest in the request must contain values that
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* may be converted to a floating point representation. (Strings and
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* vtkObject pointers are not allowed.)
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* An example distance expression is "sqrt( (x0-y0)^2 + (x1-y1)^2 )"
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* which computes Euclidian distance in a plane defined by the first
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* 2 coordinates of the vectors specified.
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*/
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#include "vtkFiltersStatisticsModule.h" // For export macro
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#include "vtkKMeansDistanceFunctor.h"
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class vtkFunctionParser;
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class vtkDoubleArray;
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class VTKFILTERSSTATISTICS_EXPORT vtkKMeansDistanceFunctorCalculator
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: public vtkKMeansDistanceFunctor
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{
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public:
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static vtkKMeansDistanceFunctorCalculator* New();
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vtkTypeMacro(vtkKMeansDistanceFunctorCalculator, vtkKMeansDistanceFunctor);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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/**
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* Compute the distance from one observation to another, returning the distance
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* in the first argument.
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*/
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void operator()(double&, vtkVariantArray*, vtkVariantArray*) override;
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//@{
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/**
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* Set/get the distance function expression.
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*/
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vtkSetStringMacro(DistanceExpression);
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vtkGetStringMacro(DistanceExpression);
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//@}
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//@{
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/**
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* Set/get the string containing an expression which evaluates to the
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* distance metric used for k-means computation. The scalar variables
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* "x0", "x1", ... "xn" and "y0", "y1", ..., "yn" refer to the coordinates
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* involved in the computation.
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*/
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virtual void SetFunctionParser(vtkFunctionParser*);
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vtkGetObjectMacro(FunctionParser, vtkFunctionParser);
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//@}
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protected:
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vtkKMeansDistanceFunctorCalculator();
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~vtkKMeansDistanceFunctorCalculator() override;
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char* DistanceExpression;
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int TupleSize;
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vtkFunctionParser* FunctionParser;
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private:
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vtkKMeansDistanceFunctorCalculator(const vtkKMeansDistanceFunctorCalculator&) = delete;
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void operator=(const vtkKMeansDistanceFunctorCalculator&) = delete;
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};
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#endif // vtkKMeansDistanceFunctorCalculator_h
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