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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkRegularPolygonSource.h"
#include "vtkCellArray.h"
#include "vtkDoubleArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkStreamingDemandDrivenPipeline.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkRegularPolygonSource);
vtkRegularPolygonSource::vtkRegularPolygonSource()
{
this->NumberOfSides = 6;
this->Center[0] = 0.0;
this->Center[1] = 0.0;
this->Center[2] = 0.0;
this->Normal[0] = 0.0;
this->Normal[1] = 0.0;
this->Normal[2] = 1.0;
this->Radius = 0.5;
this->GeneratePolygon = 1;
this->GeneratePolyline = 1;
this->OutputPointsPrecision = SINGLE_PRECISION;
this->SetNumberOfInputPorts(0);
}
int vtkRegularPolygonSource::RequestData(vtkInformation* vtkNotUsed(request),
vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* outputVector)
{
// Get the info object
vtkInformation* outInfo = outputVector->GetInformationObject(0);
// Get the output
vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));
double x[3], r[3];
int i, j, numPts = this->NumberOfSides;
vtkPoints* newPoints;
vtkCellArray* newPoly;
vtkCellArray* newLine;
// Prepare to produce the output; create the connectivity array(s)
newPoints = vtkPoints::New();
// Set the desired precision for the points in the output.
if (this->OutputPointsPrecision == vtkAlgorithm::DOUBLE_PRECISION)
{
newPoints->SetDataType(VTK_DOUBLE);
}
else
{
newPoints->SetDataType(VTK_FLOAT);
}
newPoints->Allocate(numPts);
if (this->GeneratePolyline)
{
newLine = vtkCellArray::New();
newLine->AllocateEstimate(1, numPts);
newLine->InsertNextCell(numPts + 1);
for (i = 0; i < numPts; i++)
{
newLine->InsertCellPoint(i);
}
newLine->InsertCellPoint(0); // close the polyline
output->SetLines(newLine);
newLine->Delete();
}
if (this->GeneratePolygon)
{
newPoly = vtkCellArray::New();
newPoly->AllocateEstimate(1, numPts);
newPoly->InsertNextCell(numPts);
for (i = 0; i < numPts; i++)
{
newPoly->InsertCellPoint(i);
}
output->SetPolys(newPoly);
newPoly->Delete();
}
// Produce a unit vector in the plane of the polygon (i.e., perpendicular
// to the normal)
double n[3], axis[3], px[3], py[3];
// Make sure the polygon normal is a unit vector
n[0] = this->Normal[0];
n[1] = this->Normal[1];
n[2] = this->Normal[2];
if (vtkMath::Normalize(n) == 0.0)
{
n[0] = 0.0;
n[1] = 0.0;
n[2] = 1.0;
}
// Cross with unit axis vectors and eventually find vector in the polygon plane
int foundPlaneVector = 0;
axis[0] = 1.0;
axis[1] = 0.0;
axis[2] = 0.0;
vtkMath::Cross(n, axis, px);
if (vtkMath::Normalize(px) > 1.0E-3)
{
foundPlaneVector = 1;
}
if (!foundPlaneVector)
{
axis[0] = 0.0;
axis[1] = 1.0;
axis[2] = 0.0;
vtkMath::Cross(n, axis, px);
if (vtkMath::Normalize(px) > 1.0E-3)
{
foundPlaneVector = 1;
}
}
if (!foundPlaneVector)
{
axis[0] = 0.0;
axis[1] = 0.0;
axis[2] = 1.0;
vtkMath::Cross(n, axis, px);
vtkMath::Normalize(px);
}
vtkMath::Cross(px, n, py); // created two orthogonal axes in the polygon plane, px & py
// Now run around normal vector to produce polygon points.
double theta = 2.0 * vtkMath::Pi() / numPts;
for (j = 0; j < numPts; j++)
{
for (i = 0; i < 3; i++)
{
r[i] = px[i] * cos((double)j * theta) + py[i] * sin((double)j * theta);
x[i] = this->Center[i] + this->Radius * r[i];
}
newPoints->InsertNextPoint(x);
}
output->SetPoints(newPoints);
newPoints->Delete();
return 1;
}
void vtkRegularPolygonSource::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Number of Sides: " << this->NumberOfSides << "\n";
os << indent << "Center: (" << this->Center[0] << ", " << this->Center[1] << ", "
<< this->Center[2] << ")\n";
os << indent << "Normal: (" << this->Normal[0] << ", " << this->Normal[1] << ", "
<< this->Normal[2] << ")\n";
os << indent << "Radius: " << this->Radius << "\n";
os << indent << "Generate Polygon: " << (this->GeneratePolygon ? "On\n" : "Off\n");
os << indent << "Generate Polyline: " << (this->GeneratePolyline ? "On\n" : "Off\n");
os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}
VTK_ABI_NAMESPACE_END
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