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vtkArcSource.cxx
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vtkArcSource.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkArcSource.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 "vtkArcSource.h"
#include "vtkCellArray.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkMath.h"
#include <cmath>
vtkStandardNewMacro(vtkArcSource);
// --------------------------------------------------------------------------
vtkArcSource::vtkArcSource(int res)
{
// Default first point
this->Point1[0] = 0.0;
this->Point1[1] = 0.5;
this->Point1[2] = 0.0;
// Default second point
this->Point2[0] = 0.5;
this->Point2[1] = 0.0;
this->Point2[2] = 0.0;
// 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 the positive Z direction.
this->Normal[0] = 0.0;
this->Normal[1] = 0.0;
this->Normal[2] = 1.0;
// Default polar vector is unit in the positive X direction.
this->PolarVector[0] = 1.0;
this->PolarVector[1] = 0.0;
this->PolarVector[2] = 0.0;
// Default arc is a quarter-circle
this->Angle = 90.;
// Ensure resolution (number of line segments to approximate the arc)
// is at least 1
this->Resolution = (res < 1 ? 1 : res);
// By default use the shortest angular sector
// rather than its complement (a.k.a. negative coterminal)
this->Negative = false;
// By default use the original API (endpoints + center)
this->UseNormalAndAngle = false;
this->OutputPointsPrecision = SINGLE_PRECISION;
// This is a source
this->SetNumberOfInputPorts( 0 );
}
// --------------------------------------------------------------------------
int vtkArcSource::RequestInformation(
vtkInformation *vtkNotUsed(request),
vtkInformationVector **vtkNotUsed(inputVector),
vtkInformationVector *outputVector)
{
// get the info object
vtkInformation* outInfo = outputVector->GetInformationObject(0);
outInfo->Set( CAN_HANDLE_PIECE_REQUEST(), 1 );
return 1;
}
// --------------------------------------------------------------------------
int vtkArcSource::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 );
if ( outInfo->Get( vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER() ) > 0 )
{
return 1;
}
// get the ouptut
vtkPolyData* output
= vtkPolyData::SafeDownCast( outInfo->Get( vtkDataObject::DATA_OBJECT() ) );
// Calculate vector from origin to first point
// Normal and angle are either specified (consistent API) or calculated (original API)
double angle = 0.0;
double radius = 0.5;
double perpendicular[3];
double v1[3];
if ( this->UseNormalAndAngle )
{
// Retrieve angle, which is specified with this API
angle = vtkMath::RadiansFromDegrees( this->Angle );
// Retrieve polar vector, which is specified with this API
for ( int i = 0; i < 3; ++ i )
{
v1[i] = this->PolarVector[i];
}
// Calculate perpendicular vector with normal which is specified with this API
vtkMath::Cross( this->Normal, this->PolarVector, perpendicular );
// Calculate radius
radius = vtkMath::Normalize( v1 );
}
else // if ( this->UseNormalAndAngle )
{
// Compute the cross product of the two vectors.
for ( int i = 0; i < 3; ++ i )
{
v1[i] = this->Point1[i] - this->Center[i];
}
double v2[3] = { this->Point2[0] - this->Center[0],
this->Point2[1] - this->Center[1],
this->Point2[2] - this->Center[2] };
double normal[3];
vtkMath::Cross( v1, v2, normal );
vtkMath::Cross( normal, v1, perpendicular );
double dotprod =
vtkMath::Dot( v1, v2 ) / ( vtkMath::Norm( v1 ) * vtkMath::Norm( v2 ) );
angle = acos( dotprod );
if ( this->Negative )
{
angle -= (2.0 * vtkMath::Pi());
}
// Calcute radius
radius = vtkMath::Normalize( v1 );
} // else
// Calcute angle increment
double angleInc = angle / this->Resolution;
// Normalize perpendicular vector
vtkMath::Normalize( perpendicular );
// Now create arc points and segments
vtkPoints *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 );
vtkFloatArray *newTCoords = vtkFloatArray::New();
newTCoords->SetNumberOfComponents( 2 );
newTCoords->Allocate( 2 * numPts );
newTCoords->SetName( "Texture Coordinates" );
vtkCellArray *newLines = vtkCellArray::New();
newLines->Allocate( newLines->EstimateSize( numLines, 2 ) );
double theta = 0.0;
// Iterate over angle increments
for ( int i = 0; i <= this->Resolution; ++ i, theta += angleInc )
{
const double cosine = cos(theta);
const double sine = sin(theta);
double p[3] =
{ this->Center[0] + cosine*radius*v1[0] + sine*radius*perpendicular[0],
this->Center[1] + cosine*radius*v1[1] + sine*radius*perpendicular[1],
this->Center[2] + cosine*radius*v1[2] + sine*radius*perpendicular[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 );
newPoints->Delete();
output->GetPointData()->SetTCoords( newTCoords );
newTCoords->Delete();
output->SetLines( newLines );
newLines->Delete();
return 1;
}
// --------------------------------------------------------------------------
void vtkArcSource::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Resolution: " << this->Resolution << "\n";
os << indent << "Point 1: (" << this->Point1[0] << ", "
<< this->Point1[1] << ", "
<< this->Point1[2] << ")\n";
os << indent << "Point 2: (" << this->Point2[0] << ", "
<< this->Point2[1] << ", "
<< this->Point2[2] << ")\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 << "PolarVector: (" << this->PolarVector[0] << ", "
<< this->PolarVector[1] << ", "
<< this->PolarVector[2] << ")\n";
os << indent << "Angle: " << this->Angle << "\n";
os << indent << "Negative: " << this->Negative << "\n";
os << indent << "UseNormalAndAngle: " << this->UseNormalAndAngle << "\n";
os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}