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/*=========================================================================
Program: Visualization Toolkit
Module: vtkCylinderSource.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 "vtkCylinderSource.h"
#include "vtkMath.h"
#include "vtkCellArray.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include <cmath>
vtkStandardNewMacro(vtkCylinderSource);
vtkCylinderSource::vtkCylinderSource (int res)
{
this->Resolution = res;
this->Height = 1.0;
this->Radius = 0.5;
this->Capping = 1;
this->Center[0] = this->Center[1] = this->Center[2] = 0.0;
this->OutputPointsPrecision = SINGLE_PRECISION;
this->SetNumberOfInputPorts(0);
}
int vtkCylinderSource::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()));
double angle= 2.0 * vtkMath::Pi()/this->Resolution;
int numPolys, numPts;
double xbot[3], tcbot[2], nbot[3];
double xtop[3], tctop[2], ntop[3];
double *center = this->Center;
int i, idx;
vtkIdType pts[VTK_CELL_SIZE];
vtkPoints *newPoints;
vtkFloatArray *newNormals;
vtkFloatArray *newTCoords;
vtkCellArray *newPolys;
//
// Set things up; allocate memory
//
if ( this->Capping )
{
numPts = 4*this->Resolution;
numPolys = this->Resolution + 2;
}
else
{
numPts = 2*this->Resolution;
numPolys = this->Resolution;
}
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);
newNormals = vtkFloatArray::New();
newNormals->SetNumberOfComponents(3);
newNormals->Allocate(numPts);
newNormals->SetName("Normals");
newTCoords = vtkFloatArray::New();
newTCoords->SetNumberOfComponents(2);
newTCoords->Allocate(numPts);
newTCoords->SetName("TCoords");
newPolys = vtkCellArray::New();
newPolys->Allocate(newPolys->EstimateSize(numPolys,this->Resolution));
//
// Generate points and point data for sides
//
for (i=0; i<this->Resolution; i++)
{
// x coordinate
nbot[0] = ntop[0] = cos(i*angle);
xbot[0] = (nbot[0] * this->Radius) + center[0];
xtop[0] = (ntop[0] * this->Radius) + center[0];
tcbot[0] = tctop[0] = fabs(2.0*i/this->Resolution - 1.0);
// y coordinate
xbot[1] = 0.5 * this->Height + center[1];
xtop[1] = -0.5 * this->Height + center[1];
nbot[1] = ntop[1] = 0.0;
tcbot[1] = 0.0;
tctop[1] = 1.0;
// z coordinate
nbot[2] = ntop[2] = -sin(i*angle);
xbot[2] = (nbot[2] * this->Radius) + center[2];
xtop[2] = (ntop[2] * this->Radius) + center[2];
idx = 2*i;
newPoints->InsertPoint(idx,xbot);
newPoints->InsertPoint(idx+1,xtop);
newTCoords->InsertTuple(idx,tcbot);
newTCoords->InsertTuple(idx+1,tctop);
newNormals->InsertTuple(idx,nbot);
newNormals->InsertTuple(idx+1,ntop);
}
//
// Generate polygons for sides
//
for (i=0; i<this->Resolution; i++)
{
pts[0] = 2*i;
pts[1] = pts[0] + 1;
pts[2] = (pts[1] + 2) % (2*this->Resolution);
pts[3] = pts[2] - 1;
newPolys->InsertNextCell(4,pts);
}
//
// Generate points and point data for top/bottom polygons
//
if ( this->Capping )
{
for (i=0; i<this->Resolution; i++)
{
// x coordinate
xbot[0] = xtop[0] = this->Radius * cos(i*angle);
nbot[0] = ntop[0] = 0.0;
tcbot[0] = tctop[0] = xbot[0];
xbot[0] += center[0]; xtop[0] += center[0];
// y coordinate
xbot[1] = 0.5 * this->Height;
xtop[1] = -0.5 * this->Height;
nbot[1] = 1.0;
ntop[1] = -1.0;
xbot[1] += center[1]; xtop[1] += center[1];
// z coordinate
xbot[2] = xtop[2] = -this->Radius * sin(i*angle);
tcbot[1] = tctop[1] = xbot[2];
xbot[2] += center[2]; xtop[2] += center[2];
nbot[2] = 0.0;
ntop[2] = 0.0;
idx = 2*this->Resolution;
newPoints->InsertPoint(idx+i,xbot);
newTCoords->InsertTuple(idx+i,tcbot);
newNormals->InsertTuple(idx+i,nbot);
idx = 3*this->Resolution;
newPoints->InsertPoint(idx+this->Resolution-i-1,xtop);
newTCoords->InsertTuple(idx+this->Resolution-i-1,tctop);
newNormals->InsertTuple(idx+this->Resolution-i-1,ntop);
}
//
// Generate polygons for top/bottom polygons
//
for (i=0; i<this->Resolution; i++)
{
pts[i] = 2*this->Resolution + i;
}
newPolys->InsertNextCell(this->Resolution,pts);
for (i=0; i<this->Resolution; i++)
{
pts[i] = 3*this->Resolution + i;
}
newPolys->InsertNextCell(this->Resolution,pts);
} // if capping
//
// Update ourselves and release memory
//
output->SetPoints(newPoints);
newPoints->Delete();
output->GetPointData()->SetNormals(newNormals);
newNormals->Delete();
output->GetPointData()->SetTCoords(newTCoords);
newTCoords->Delete();
newPolys->Squeeze(); // since we've estimated size; reclaim some space
output->SetPolys(newPolys);
newPolys->Delete();
return 1;
}
void vtkCylinderSource::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Resolution: " << this->Resolution << "\n";
os << indent << "Height: " << this->Height << "\n";
os << indent << "Radius: " << this->Radius << "\n";
os << indent << "Center: (" << this->Center[0] << ", "
<< this->Center[1] << ", " << this->Center[2] << " )\n";
os << indent << "Capping: " << (this->Capping ? "On\n" : "Off\n");
os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}
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