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/*=========================================================================
Program: Visualization Toolkit
Module: vtkEllipseArcSource.cxx
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.
=========================================================================*/
#include "vtkEllipseArcSource.h"
#include "vtkCellArray.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkMathUtilities.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkPoints.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkStreamingDemandDrivenPipeline.h"
vtkStandardNewMacro(vtkEllipseArcSource);
// --------------------------------------------------------------------------
vtkEllipseArcSource::vtkEllipseArcSource()
{
// Default center is origin
this->Center[0] = 0.0;
this->Center[1] = 0.0;
this->Center[2] = 0.0;
// Default normal vector is unit in Oz direction
this->Normal[0] = 0.0;
this->Normal[1] = 0.0;
this->Normal[2] = 1.0;
this->MajorRadiusVector[0] = 1.0;
this->MajorRadiusVector[1] = 0.0;
this->MajorRadiusVector[2] = 0.0;
// Default arc is a quarter-circle
this->StartAngle = 0.0;
this->SegmentAngle = 90.;
// Default resolution
this->Resolution = 100;
this->OutputPointsPrecision = SINGLE_PRECISION;
// Default Ratio
this->Ratio = 1.0;
// This is a source
this->SetNumberOfInputPorts(0);
}
// --------------------------------------------------------------------------
int vtkEllipseArcSource::RequestData(vtkInformation* vtkNotUsed(request),
vtkInformationVector** vtkNotUsed(inputVector),
vtkInformationVector* outputVector)
{
int numLines = this->Resolution;
int numPts = this->Resolution + 1;
double tc[3] = { 0.0, 0.0, 0.0 };
// get the info object
vtkInformation* outInfo = outputVector->GetInformationObject(0);
// get the ouptut
vtkPolyData* output =
vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));
double a = 1.0, b = 1.0;
double majorRadiusVect[3];
double orthogonalVect[3];
double startAngleRad = 0.0, segmentAngleRad, angleIncRad;
// make sure the normal vector is normalized
vtkMath::Normalize(this->Normal);
// get orthonal vector between user-defined major radius and this->Normal
vtkMath::Cross(this->Normal, this->MajorRadiusVector, orthogonalVect);
if (vtkMathUtilities::FuzzyCompare(vtkMath::Norm(orthogonalVect), 0.0))
{
vtkErrorMacro(<< "Ellipse normal vector and major radius axis are collinear");
return 0;
}
vtkMath::Normalize(orthogonalVect);
// get major Radius Vector adjusted to be on the plane defined by this->Normal
vtkMath::Cross(orthogonalVect, this->Normal, majorRadiusVect);
vtkMath::Normalize(majorRadiusVect);
// set the major and minor Radius values
a = vtkMath::Norm(this->MajorRadiusVector);
b = a * this->Ratio;
// user-defined angles (positive only)
startAngleRad = vtkMath::RadiansFromDegrees(this->StartAngle);
if (startAngleRad < 0)
{
startAngleRad += 2.0 * vtkMath::Pi();
}
segmentAngleRad = vtkMath::RadiansFromDegrees(this->SegmentAngle);
// Calcute angle increment
angleIncRad = segmentAngleRad / this->Resolution;
// Now create arc points and segments
vtkNew<vtkPoints> newPoints;
// 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);
vtkNew<vtkFloatArray> newTCoords;
newTCoords->SetNumberOfComponents(2);
newTCoords->Allocate(2 * numPts);
newTCoords->SetName("Texture Coordinates");
vtkNew<vtkCellArray> newLines;
newLines->Allocate(newLines->EstimateSize(numLines, 2));
double theta = startAngleRad;
double thetaEllipse;
// Iterate over angle increments
for (int i = 0; i <= this->Resolution; ++i, theta += angleIncRad)
{
// convert section angle to an angle applied to ellipse equation.
// the result point with the ellipse angle, will be located on section angle
int quotient = (int)(theta / (2.0 * vtkMath::Pi()));
theta = theta - quotient * 2.0 * vtkMath::Pi();
// result range: -pi/2, pi/2
thetaEllipse = atan(tan(theta) / this->Ratio);
//theta range: 0, 2 * pi
if (theta > vtkMath::Pi() / 2 && theta <= vtkMath::Pi())
{
thetaEllipse += vtkMath::Pi();
}
else if (theta > vtkMath::Pi() && theta <= 1.5 * vtkMath::Pi())
{
thetaEllipse -= vtkMath::Pi();
}
const double cosTheta = cos(thetaEllipse);
const double sinTheta = sin(thetaEllipse);
double p[3] =
{
this->Center[0] + a * cosTheta * majorRadiusVect[0] + b * sinTheta * orthogonalVect[0],
this->Center[1] + a * cosTheta * majorRadiusVect[1] + b * sinTheta * orthogonalVect[1],
this->Center[2] + a * cosTheta * majorRadiusVect[2] + b * sinTheta * orthogonalVect[2]
};
tc[0] = static_cast<double>(i) / this->Resolution;
newPoints->InsertPoint(i , p);
newTCoords->InsertTuple(i, tc);
}
newLines->InsertNextCell(numPts);
for (int k = 0; k < numPts; ++ k)
{
newLines->InsertCellPoint(k);
}
output->SetPoints(newPoints.Get());
output->GetPointData()->SetTCoords(newTCoords.Get());
output->SetLines(newLines.Get());
return 1;
}
// --------------------------------------------------------------------------
void vtkEllipseArcSource::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Resolution: " << this->Resolution << "\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 << "Major Radius Vector: (" << this->MajorRadiusVector[0] << ", "
<< this->MajorRadiusVector[1] << ", "
<< this->MajorRadiusVector[2] << ")\n";
os << indent << "StartAngle: " << this->StartAngle << "\n";
os << indent << "SegmentAngle: " << this->SegmentAngle << "\n";
os << indent << "Resolution: " << this->Resolution << "\n";
os << indent << "Ratio: " << this->Ratio << "\n";
os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}
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