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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 "vtkSmartPointer.h"
#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 "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkTransform.h"
#include "vtkTransformPolyDataFilter.h"
#include "vtkWarpScalar.h"
int expCos( int , char *[] )
{
int i, numPts;
double x[3];
double r, deriv;
vtkSmartPointer<vtkRenderer> ren =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();
renWin->AddRenderer(ren);
vtkSmartPointer<vtkRenderWindowInteractor> iren =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
iren->SetRenderWindow(renWin);
// create plane to warp
vtkSmartPointer<vtkPlaneSource> plane =
vtkSmartPointer<vtkPlaneSource>::New();
plane->SetResolution (300,300);
vtkSmartPointer<vtkTransform> transform =
vtkSmartPointer<vtkTransform>::New();
transform->Scale(10.0,10.0,1.0);
vtkSmartPointer<vtkTransformPolyDataFilter> transF =
vtkSmartPointer<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.
//
vtkSmartPointer<vtkPolyData> input = transF->GetOutput();
numPts = input->GetNumberOfPoints();
vtkSmartPointer<vtkPoints> newPts =
vtkSmartPointer<vtkPoints>::New();
newPts->SetNumberOfPoints(numPts);
vtkSmartPointer<vtkFloatArray> derivs =
vtkSmartPointer<vtkFloatArray>::New();
derivs->SetNumberOfTuples(numPts);
vtkSmartPointer<vtkPolyData> bessel =
vtkSmartPointer<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);
}
// warp plane
vtkSmartPointer<vtkWarpScalar> warp =
vtkSmartPointer<vtkWarpScalar>::New();
warp->SetInputData(bessel);
warp->XYPlaneOn();
warp->SetScaleFactor(0.5);
// mapper and actor
vtkSmartPointer<vtkDataSetMapper> mapper =
vtkSmartPointer<vtkDataSetMapper>::New();
mapper->SetInputConnection(warp->GetOutputPort());
double tmp[2];
bessel->GetScalarRange(tmp);
mapper->SetScalarRange(tmp[0],tmp[1]);
vtkSmartPointer<vtkActor> carpet =
vtkSmartPointer<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();
iren->Start();
return EXIT_SUCCESS;
}
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