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126 lines
3.9 KiB
126 lines
3.9 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkPointSource.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkPointSource.h"
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#include "vtkCellArray.h"
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#include "vtkMath.h"
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#include "vtkInformation.h"
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#include "vtkInformationVector.h"
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#include "vtkObjectFactory.h"
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#include "vtkPoints.h"
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#include "vtkPolyData.h"
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#include <float.h>
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#include <math.h>
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vtkCxxRevisionMacro(vtkPointSource, "$Revision: 1.45 $");
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vtkStandardNewMacro(vtkPointSource);
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//----------------------------------------------------------------------------
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vtkPointSource::vtkPointSource(vtkIdType numPts)
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{
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this->NumberOfPoints = (numPts > 0 ? numPts : 10);
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this->Center[0] = 0.0;
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this->Center[1] = 0.0;
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this->Center[2] = 0.0;
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this->Radius = 0.5;
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this->Distribution = VTK_POINT_UNIFORM;
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this->SetNumberOfInputPorts(0);
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}
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//----------------------------------------------------------------------------
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int vtkPointSource::RequestData(
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vtkInformation *vtkNotUsed(request),
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vtkInformationVector **vtkNotUsed(inputVector),
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vtkInformationVector *outputVector)
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{
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// get the info object
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vtkInformation *outInfo = outputVector->GetInformationObject(0);
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// get the ouptut
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vtkPolyData *output = vtkPolyData::SafeDownCast(
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outInfo->Get(vtkDataObject::DATA_OBJECT()));
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vtkIdType i;
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double theta, rho, cosphi, sinphi, radius;
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double x[3];
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vtkPoints *newPoints;
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vtkCellArray *newVerts;
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newPoints = vtkPoints::New();
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newPoints->Allocate(this->NumberOfPoints);
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newVerts = vtkCellArray::New();
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newVerts->Allocate(newVerts->EstimateSize(1,this->NumberOfPoints));
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newVerts->InsertNextCell(this->NumberOfPoints);
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if (this->Distribution == VTK_POINT_SHELL)
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{ // only produce points on the surface of the sphere
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for (i=0; i<this->NumberOfPoints; i++)
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{
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cosphi = 1 - 2*vtkMath::Random();
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sinphi = sqrt(1 - cosphi*cosphi);
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radius = this->Radius * sinphi;
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theta = 6.2831853 * vtkMath::Random();
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x[0] = this->Center[0] + radius*cos(theta);
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x[1] = this->Center[1] + radius*sin(theta);
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x[2] = this->Center[2] + this->Radius*cosphi;
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newVerts->InsertCellPoint(newPoints->InsertNextPoint(x));
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}
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}
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else
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{ // uniform distribution throughout the sphere volume
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for (i=0; i<this->NumberOfPoints; i++)
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{
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cosphi = 1 - 2*vtkMath::Random();
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sinphi = sqrt(1 - cosphi*cosphi);
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rho = this->Radius*pow(vtkMath::Random(),0.33333333);
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radius = rho * sinphi;
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theta = 6.2831853 * vtkMath::Random();
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x[0] = this->Center[0] + radius*cos(theta);
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x[1] = this->Center[1] + radius*sin(theta);
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x[2] = this->Center[2] + rho*cosphi;
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newVerts->InsertCellPoint(newPoints->InsertNextPoint(x));
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}
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}
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//
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// Update ourselves and release memory
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//
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output->SetPoints(newPoints);
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newPoints->Delete();
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output->SetVerts(newVerts);
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newVerts->Delete();
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return 1;
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}
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//----------------------------------------------------------------------------
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void vtkPointSource::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "Number Of Points: " << this->NumberOfPoints << "\n";
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os << indent << "Radius: " << this->Radius << "\n";
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os << indent << "Center: (" << this->Center[0] << ", "
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<< this->Center[1] << ", "
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<< this->Center[2] << ")\n";
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os << indent << "Distribution: " <<
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((this->Distribution == VTK_POINT_SHELL) ? "Shell\n" : "Uniform\n");
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}
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