Range.h

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//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt 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.
//============================================================================
 
#ifndef vtk_m_Range_h
#define vtk_m_Range_h
 
#include <vtkm/Assert.h>
#include <vtkm/Math.h>
#include <vtkm/Types.h>
#include <vtkm/VecTraits.h>
 
namespace vtkm
{
 
struct Range
{
  vtkm::Float64 Min;
  vtkm::Float64 Max;
 
  VTKM_EXEC_CONT
  Range()
    : Min(vtkm::Infinity64())
    , Max(vtkm::NegativeInfinity64())
  {
  }
 
  Range(const Range&) = default;
  Range(Range&&) = default;
 
  template <typename T1, typename T2>
  VTKM_EXEC_CONT Range(const T1& min, const T2& max)
    : Min(static_cast<vtkm::Float64>(min))
    , Max(static_cast<vtkm::Float64>(max))
  {
  }
 
  vtkm::Range& operator=(const vtkm::Range& src) = default;
  vtkm::Range& operator=(vtkm::Range&& src) = default;
 
  VTKM_EXEC_CONT
  bool IsNonEmpty() const { return (this->Min <= this->Max); }
 
  template <typename T>
  VTKM_EXEC_CONT bool Contains(const T& value) const
  {
    return ((this->Min <= static_cast<vtkm::Float64>(value)) &&
            (this->Max >= static_cast<vtkm::Float64>(value)));
  }
 
  VTKM_EXEC_CONT
  vtkm::Float64 Length() const
  {
    if (this->IsNonEmpty())
    {
      return (this->Max - this->Min);
    }
    else
    {
      return 0.0;
    }
  }
 
  VTKM_EXEC_CONT
  vtkm::Float64 Center() const
  {
    if (this->IsNonEmpty())
    {
      return 0.5 * (this->Max + this->Min);
    }
    else
    {
      return vtkm::Nan64();
    }
  }
 
  template <typename T>
  VTKM_EXEC_CONT void Include(const T& value)
  {
    this->Min = vtkm::Min(this->Min, static_cast<vtkm::Float64>(value));
    this->Max = vtkm::Max(this->Max, static_cast<vtkm::Float64>(value));
  }
 
  VTKM_EXEC_CONT
  void Include(const vtkm::Range& range)
  {
    if (range.IsNonEmpty())
    {
      this->Min = vtkm::Min(this->Min, range.Min);
      this->Max = vtkm::Max(this->Max, range.Max);
    }
  }
 
  VTKM_EXEC_CONT
  vtkm::Range Union(const vtkm::Range& otherRange) const
  {
    vtkm::Range unionRange(*this);
    unionRange.Include(otherRange);
    return unionRange;
  }
 
  VTKM_EXEC_CONT
  vtkm::Range Intersection(const vtkm::Range& otherRange) const
  {
    return vtkm::Range(vtkm::Max(this->Min, otherRange.Min), vtkm::Min(this->Max, otherRange.Max));
  }
 
  VTKM_EXEC_CONT
  vtkm::Range operator+(const vtkm::Range& otherRange) const { return this->Union(otherRange); }
 
  VTKM_EXEC_CONT
  bool operator==(const vtkm::Range& otherRange) const
  {
    return ((this->Min == otherRange.Min) && (this->Max == otherRange.Max));
  }
 
  VTKM_EXEC_CONT
  bool operator!=(const vtkm::Range& otherRange) const
  {
    return ((this->Min != otherRange.Min) || (this->Max != otherRange.Max));
  }
};
 
inline VTKM_CONT std::ostream& operator<<(std::ostream& stream, const vtkm::Range& range)
{
  return stream << "[" << range.Min << ".." << range.Max << "]";
} // Declared inside of vtkm namespace so that the operator work with ADL lookup
 
template <>
struct VTKM_NEVER_EXPORT VecTraits<vtkm::Range>
{
  using ComponentType = vtkm::Float64;
  using BaseComponentType = vtkm::Float64;
 
  static constexpr vtkm::IdComponent NUM_COMPONENTS = 2;
  static constexpr vtkm::IdComponent GetNumberOfComponents(const vtkm::Range&)
  {
    return NUM_COMPONENTS;
  }
  using HasMultipleComponents = vtkm::VecTraitsTagMultipleComponents;
  using IsSizeStatic = vtkm::VecTraitsTagSizeStatic;
 
  VTKM_EXEC_CONT
  static const ComponentType& GetComponent(const vtkm::Range& range, vtkm::IdComponent component)
  {
    VTKM_ASSERT((component == 0) || (component == 1));
    return (component == 0) ? range.Min : range.Max;
  }
  VTKM_EXEC_CONT
  static ComponentType& GetComponent(vtkm::Range& range, vtkm::IdComponent component)
  {
    VTKM_ASSERT((component == 0) || (component == 1));
    return (component == 0) ? range.Min : range.Max;
  }
 
  VTKM_EXEC_CONT
  static void SetComponent(vtkm::Range& range, vtkm::IdComponent component, ComponentType value)
  {
    VTKM_ASSERT((component == 0) || (component == 1));
    if (component == 0)
    {
      range.Min = value;
    }
    else
    {
      range.Max = value;
    }
  }
 
  template <typename NewComponentType>
  using ReplaceComponentType = vtkm::Vec<NewComponentType, NUM_COMPONENTS>;
  template <typename NewComponentType>
  using ReplaceBaseComponentType = vtkm::Vec<NewComponentType, NUM_COMPONENTS>;
 
  template <vtkm::IdComponent destSize>
  VTKM_EXEC_CONT static void CopyInto(const vtkm::Range& src,
                                      vtkm::Vec<ComponentType, destSize>& dest)
  {
    const vtkm::IdComponent maxComponent = (destSize < NUM_COMPONENTS) ? destSize : NUM_COMPONENTS;
    for (vtkm::IdComponent component = 0; component < maxComponent; ++component)
    {
      dest[component] = GetComponent(src, component);
    }
  }
};
 
} // namespace vtkm
 
 
#endif //vtk_m_Range_h