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/*=========================================================================
Program: Visualization Toolkit
Module: expCos.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.
=========================================================================*/
//
// Brute force computation of Bessel functions. Might be better to create a
// filter (or source) object. Might also consider vtkSampleFunction.
#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkDataSetMapper.h"
#include "vtkDebugLeaks.h"
#include "vtkFloatArray.h"
#include "vtkPlaneSource.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkRegressionTestImage.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkTransform.h"
#include "vtkTransformPolyDataFilter.h"
#include "vtkWarpScalar.h"
int expCos( int argc, char *argv[] )
{
int i, numPts;
double x[3];
double r, deriv;
vtkRenderer *ren = vtkRenderer::New();
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->AddRenderer(ren);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
// create plane to warp
vtkPlaneSource *plane = vtkPlaneSource::New();
plane->SetResolution (300,300);
vtkTransform *transform = vtkTransform::New();
transform->Scale(10.0,10.0,1.0);
vtkTransformPolyDataFilter *transF = vtkTransformPolyDataFilter::New();
transF->SetInputConnection(plane->GetOutputPort());
transF->SetTransform(transform);
transF->Update();
// compute Bessel function and derivatives. This portion could be
// encapsulated into source or filter object.
//
vtkPolyData *input = transF->GetOutput();
numPts = input->GetNumberOfPoints();
vtkPoints *newPts = vtkPoints::New();
newPts->SetNumberOfPoints(numPts);
vtkFloatArray *derivs = vtkFloatArray::New();
derivs->SetNumberOfTuples(numPts);
vtkPolyData *bessel = vtkPolyData::New();
bessel->CopyStructure(input);
bessel->SetPoints(newPts);
bessel->GetPointData()->SetScalars(derivs);
for (i=0; i<numPts; i++)
{
input->GetPoint(i,x);
r = sqrt(static_cast<double>(x[0]*x[0]) + x[1]*x[1]);
x[2] = exp(-r) * cos (10.0*r);
newPts->SetPoint(i,x);
deriv = -exp(-r) * (cos(10.0*r) + 10.0*sin(10.0*r));
derivs->SetValue(i,deriv);
}
newPts->Delete(); //reference counting - it's ok
derivs->Delete();
// warp plane
vtkWarpScalar *warp = vtkWarpScalar::New();
warp->SetInput(bessel);
warp->XYPlaneOn();
warp->SetScaleFactor(0.5);
// mapper and actor
vtkDataSetMapper *mapper = vtkDataSetMapper::New();
mapper->SetInputConnection(warp->GetOutputPort());
double tmp[2];
bessel->GetScalarRange(tmp);
mapper->SetScalarRange(tmp[0],tmp[1]);
vtkActor *carpet = vtkActor::New();
carpet->SetMapper(mapper);
// assign our actor to the renderer
ren->AddActor(carpet);
ren->SetBackground(1,1,1);
renWin->SetSize(300,300);
// draw the resulting scene
ren->ResetCamera();
ren->GetActiveCamera()->Zoom(1.4);
ren->GetActiveCamera()->Elevation(-55);
ren->GetActiveCamera()->Azimuth(25);
ren->ResetCameraClippingRange();
renWin->Render();
int retVal = vtkRegressionTestImage( renWin );
if ( retVal == vtkRegressionTester::DO_INTERACTOR)
{
iren->Start();
}
// Clean up
ren->Delete();
renWin->Delete();
iren->Delete();
plane->Delete();
transform->Delete();
transF->Delete();
bessel->Delete();
warp->Delete();
mapper->Delete();
carpet->Delete();
return !retVal;
}
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