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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkSmoothErrorMetric.h"
#include "vtkGenericAdaptorCell.h"
#include "vtkGenericAttribute.h"
#include "vtkGenericAttributeCollection.h"
#include "vtkGenericDataSet.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include <cassert>
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkSmoothErrorMetric);
//------------------------------------------------------------------------------
vtkSmoothErrorMetric::vtkSmoothErrorMetric()
{
this->AngleTolerance = 90.1; // in degrees
this->CosTolerance = cos(vtkMath::RadiansFromDegrees(this->AngleTolerance));
}
//------------------------------------------------------------------------------
vtkSmoothErrorMetric::~vtkSmoothErrorMetric() = default;
//------------------------------------------------------------------------------
double vtkSmoothErrorMetric::GetAngleTolerance()
{
return this->AngleTolerance;
}
//------------------------------------------------------------------------------
void vtkSmoothErrorMetric::SetAngleTolerance(double value)
{
// assert("pre: positive_value" && value>90 && value<180);
if (this->AngleTolerance != value)
{
// Clamp the value
if (value <= 90)
{
vtkWarningMacro(<< "value " << value << " out of range ]90,180[, clamped to 90.1");
this->AngleTolerance = 90.1;
}
else
{
if (value >= 180)
{
vtkWarningMacro(<< "value " << value << " out of range ]90,180[, clamped to 179.9");
this->AngleTolerance = 179.9;
}
else
{
this->AngleTolerance = value;
}
}
this->CosTolerance = cos(vtkMath::RadiansFromDegrees(this->AngleTolerance));
this->Modified();
}
}
//------------------------------------------------------------------------------
int vtkSmoothErrorMetric::RequiresEdgeSubdivision(
double* leftPoint, double* midPoint, double* rightPoint, double vtkNotUsed(alpha))
{
assert("pre: leftPoint_exists" && leftPoint != nullptr);
assert("pre: midPoint_exists" && midPoint != nullptr);
assert("pre: rightPoint_exists" && rightPoint != nullptr);
// assert( "pre: clamped_alpha" && alpha>0 && alpha < 1. ); // or else true
if (this->GenericCell->IsGeometryLinear())
{
// don't need to do anything:
return 0;
}
double a[3];
double b[3];
a[0] = leftPoint[0] - midPoint[0];
a[1] = leftPoint[1] - midPoint[1];
a[2] = leftPoint[2] - midPoint[2];
b[0] = rightPoint[0] - midPoint[0];
b[1] = rightPoint[1] - midPoint[1];
b[2] = rightPoint[2] - midPoint[2];
double dota = vtkMath::Dot(a, a);
double dotb = vtkMath::Dot(b, b);
double cosa;
if (dota == 0 || dotb == 0)
{
cosa = -1.;
}
else
{
cosa = vtkMath::Dot(a, b) / sqrt(dota * dotb);
}
int result = (cosa > this->CosTolerance);
return result;
}
//------------------------------------------------------------------------------
// Description:
// Return the error at the mid-point. The type of error depends on the state
// of the concrete error metric. For instance, it can return an absolute
// or relative error metric.
// See RequiresEdgeSubdivision() for a description of the arguments.
// \post positive_result: result>=0
double vtkSmoothErrorMetric::GetError(
double* leftPoint, double* midPoint, double* rightPoint, double vtkNotUsed(alpha))
{
assert("pre: leftPoint_exists" && leftPoint != nullptr);
assert("pre: midPoint_exists" && midPoint != nullptr);
assert("pre: rightPoint_exists" && rightPoint != nullptr);
// assert( "pre: clamped_alpha" && alpha > 0. && alpha < 1. );
if (this->GenericCell->IsGeometryLinear())
{
// don't need to do anything:
return 0.;
}
double a[3];
double b[3];
a[0] = leftPoint[0] - midPoint[0];
a[1] = leftPoint[1] - midPoint[1];
a[2] = leftPoint[2] - midPoint[2];
b[0] = rightPoint[0] - midPoint[0];
b[1] = rightPoint[1] - midPoint[1];
b[2] = rightPoint[2] - midPoint[2];
double dota = vtkMath::Dot(a, a);
double dotb = vtkMath::Dot(b, b);
double cosa;
if (dota == 0. || dotb == 0.)
{
cosa = -1.;
}
else
{
cosa = vtkMath::Dot(a, b) / sqrt(dota * dotb);
}
if (cosa > 1.)
{
cosa = 1.;
}
else if (cosa < -1.)
{
cosa = -1.;
}
double result = 180. - vtkMath::RadiansFromDegrees(acos(cosa));
assert("post: positive_result" && result >= 0.);
return result;
}
//------------------------------------------------------------------------------
void vtkSmoothErrorMetric::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "AngleTolerance: " << this->AngleTolerance << endl;
os << indent << "CosTolerance: " << this->CosTolerance << endl;
}
VTK_ABI_NAMESPACE_END
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