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/*=========================================================================
Program: Visualization Toolkit
Module: vtkPointSource.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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 "vtkPointSource.h"
#include "vtkCellArray.h"
#include "vtkMath.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkRandomSequence.h"
#include <cfloat>
#include <cmath>
vtkStandardNewMacro(vtkPointSource);
//---------------------------------------------------------------------------
// Specify a random sequence, or use the non-threadsafe one in vtkMath by
// default.
vtkCxxSetObjectMacro(vtkPointSource, RandomSequence, vtkRandomSequence);
//----------------------------------------------------------------------------
vtkPointSource::vtkPointSource(vtkIdType numPts)
{
this->NumberOfPoints = (numPts > 0 ? numPts : 10);
this->Center[0] = 0.0;
this->Center[1] = 0.0;
this->Center[2] = 0.0;
this->Radius = 0.5;
this->Distribution = VTK_POINT_UNIFORM;
this->OutputPointsPrecision = SINGLE_PRECISION;
this->RandomSequence = NULL;
this->SetNumberOfInputPorts(0);
}
//----------------------------------------------------------------------------
vtkPointSource::~vtkPointSource()
{
this->SetRandomSequence(NULL);
}
//----------------------------------------------------------------------------
int vtkPointSource::RequestData(
vtkInformation *vtkNotUsed(request),
vtkInformationVector **vtkNotUsed(inputVector),
vtkInformationVector *outputVector)
{
// get the info object
vtkInformation *outInfo = outputVector->GetInformationObject(0);
// get the ouptut
vtkPolyData *output = vtkPolyData::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkIdType i;
double theta, rho, cosphi, sinphi, radius;
double x[3];
vtkPoints *newPoints;
vtkCellArray *newVerts;
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(this->NumberOfPoints);
newVerts = vtkCellArray::New();
newVerts->Allocate(newVerts->EstimateSize(1,this->NumberOfPoints));
newVerts->InsertNextCell(this->NumberOfPoints);
if (this->Distribution == VTK_POINT_SHELL)
{ // only produce points on the surface of the sphere
for (i=0; i<this->NumberOfPoints; i++)
{
cosphi = 1 - 2 * this->Random();
sinphi = sqrt(1 - cosphi*cosphi);
radius = this->Radius * sinphi;
theta = 2.0 * vtkMath::Pi() * this->Random();
x[0] = this->Center[0] + radius*cos(theta);
x[1] = this->Center[1] + radius*sin(theta);
x[2] = this->Center[2] + this->Radius*cosphi;
newVerts->InsertCellPoint(newPoints->InsertNextPoint(x));
}
}
else
{ // uniform distribution throughout the sphere volume
for (i=0; i<this->NumberOfPoints; i++)
{
cosphi = 1 - 2*this->Random();
sinphi = sqrt(1 - cosphi*cosphi);
rho = this->Radius*pow(this->Random(),0.33333333);
radius = rho * sinphi;
theta = 2.0 * vtkMath::Pi() * this->Random();
x[0] = this->Center[0] + radius*cos(theta);
x[1] = this->Center[1] + radius*sin(theta);
x[2] = this->Center[2] + rho*cosphi;
newVerts->InsertCellPoint(newPoints->InsertNextPoint(x));
}
}
//
// Update ourselves and release memory
//
output->SetPoints(newPoints);
newPoints->Delete();
output->SetVerts(newVerts);
newVerts->Delete();
return 1;
}
//----------------------------------------------------------------------------
double vtkPointSource::Random()
{
if (!this->RandomSequence)
{
return vtkMath::Random();
}
this->RandomSequence->Next();
return this->RandomSequence->GetValue();
}
//----------------------------------------------------------------------------
void vtkPointSource::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Number Of Points: " << this->NumberOfPoints << "\n";
os << indent << "Radius: " << this->Radius << "\n";
os << indent << "Center: (" << this->Center[0] << ", "
<< this->Center[1] << ", "
<< this->Center[2] << ")\n";
os << indent << "Distribution: " <<
((this->Distribution == VTK_POINT_SHELL) ? "Shell\n" : "Uniform\n");
os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}
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