VTK  9.2.20220811
vtkMathUtilities Namespace Reference

## Functions

template<class A >
bool FuzzyCompare (A a, A b, A epsilon=std::numeric_limits< A >::epsilon())
Perform a fuzzy compare of floats/doubles, specify the allowed tolerance. More...

template<class A >
SafeDivision (A a, A b)
Performs safe division that catches overflow and underflow. More...

template<class A >
bool NearlyEqual (A a, A b, A tol=std::numeric_limits< A >::epsilon())
A slightly different fuzzy comparator that checks if two values are "nearly" equal based on Knuth, "The Art of Computer Programming (vol II)". More...

template<class A >
void UpdateRangeImpl (A &min0, A &max0, const A &value)
Update an existing min - max range with a new prospective value. More...

template<class A >
void UpdateRange (A &min0, A &max0, const A &value, typename std::enable_if<!std::is_floating_point< A >::value >::type *=nullptr)

template<class A >
void UpdateRange (A &min0, A &max0, const A &value, typename std::enable_if< std::is_floating_point< A >::value >::type *=nullptr)

## ◆ FuzzyCompare()

template<class A >
 bool vtkMathUtilities::FuzzyCompare ( A a, A b, A epsilon = std::numeric_limits::epsilon() )

Perform a fuzzy compare of floats/doubles, specify the allowed tolerance.

Definition at line 45 of file vtkMathUtilities.h.

## ◆ SafeDivision()

template<class A >
 A vtkMathUtilities::SafeDivision ( A a, A b )

Performs safe division that catches overflow and underflow.

Definition at line 54 of file vtkMathUtilities.h.

## ◆ NearlyEqual()

template<class A >
 bool vtkMathUtilities::NearlyEqual ( A a, A b, A tol = std::numeric_limits::epsilon() )

A slightly different fuzzy comparator that checks if two values are "nearly" equal based on Knuth, "The Art of Computer Programming (vol II)".

Definition at line 78 of file vtkMathUtilities.h.

## ◆ UpdateRangeImpl()

template<class A >
 void vtkMathUtilities::UpdateRangeImpl ( A & min0, A & max0, const A & value )

Update an existing min - max range with a new prospective value.

If the value is non NaN then the appropriate range comparisons are made and updated, otherwise the original min - max values are set.

Examples:

No change: UpdateRange(-100, 100, 20) -> (-100, 100)

Update min: UpdateRange(-100, 100, -200) -> (-200, 100)

Update max: UpdateRange(-100, 100, 200) -> (-100, 200)

Input min and max are inverted creating an invalid range so a new range with the specified value is set: UpdateRange(100, -100, 20) -> (20, 20)

Input value is NaN so the original range is set UpdateRange(-100, 100, NaN) -> (-100, 100)

Definition at line 111 of file vtkMathUtilities.h.

## ◆ UpdateRange() [1/2]

template<class A >
 void vtkMathUtilities::UpdateRange ( A & min0, A & max0, const A & value, typename std::enable_if::value >::type * = nullptr )

Definition at line 127 of file vtkMathUtilities.h.

## ◆ UpdateRange() [2/2]

template<class A >
 void vtkMathUtilities::UpdateRange ( A & min0, A & max0, const A & value, typename std::enable_if< std::is_floating_point< A >::value >::type * = nullptr )

Definition at line 134 of file vtkMathUtilities.h.