vtkHyperTreeGridScales.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkHyperTreeGridScales_h
#define vtkHyperTreeGridScales_h
 
#include "vtkABINamespace.h"
 
#include <cstring> // For memcpy
#include <vector>  // For std::vector
 
VTK_ABI_NAMESPACE_BEGIN
class vtkHyperTreeGridScales
{
public:
  vtkHyperTreeGridScales(double branchfactor, const double scale[3])
    : BranchFactor(branchfactor)
    , CurrentFailLevel(1)
    , CellScales(scale, scale + 3)
  {
  }
 
  ~vtkHyperTreeGridScales() = default;
 
  double GetBranchFactor() const { return this->BranchFactor; }
 
  double* ComputeScale(unsigned int level)
  {
    this->Update(level);
    return this->CellScales.data() + 3 * level;
  }
 
  double ComputeScaleX(unsigned int level)
  {
    this->Update(level);
    return this->CellScales[3 * level + 0];
  }
 
  double ComputeScaleY(unsigned int level)
  {
    this->Update(level);
    return this->CellScales[3 * level + 1];
  }
 
  double ComputeScaleZ(unsigned int level)
  {
    this->Update(level);
    return this->CellScales[3 * level + 2];
  }

  void ComputeScale(unsigned int level, double scale[3])
  {
    this->Update(level);
    memcpy(scale, this->CellScales.data() + 3 * level, 3 * sizeof(double));
  }
 
  unsigned int GetCurrentFailLevel() const { return this->CurrentFailLevel; }
 
private:
  vtkHyperTreeGridScales(const vtkHyperTreeGridScales&) = delete;
  vtkHyperTreeGridScales& operator=(const vtkHyperTreeGridScales&) = delete;

  void Update(unsigned int level)
  {
    if (level < this->CurrentFailLevel)
    {
      return;
    }
    this->CurrentFailLevel = level + 1;
    this->CellScales.resize(3 * this->CurrentFailLevel);
    auto current = this->CellScales.begin() + 3 * (this->CurrentFailLevel - 1);
    auto previous = current - 3;
    auto end = this->CellScales.end();
    for (; current != end; ++current, ++previous)
    {
      *current = *previous / this->BranchFactor;
    }
  }

  const double BranchFactor;

  unsigned int CurrentFailLevel;
  std::vector<double> CellScales;
};
 
VTK_ABI_NAMESPACE_END
#endif
// VTK-HeaderTest-Exclude: vtkHyperTreeGridScales.h