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#include <vtkSmartPointer.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkAppendPolyData.h>
#include <vtkClipPolyData.h>
#include <vtkCleanPolyData.h>
#include <vtkContourFilter.h>
#include <vtkFloatArray.h>
#include <vtkCellData.h>
#include <vtkPointData.h>
#include <vtkScalarsToColors.h>
#include <vtkLookupTable.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vector>
int main (int argc, char *argv[])
{
if (argc < 3)
{
std::cerr << "Usage: " << argv[0] << " InputPolyDataFile(.vtp) NumberOfContours" << std::endl;
return EXIT_FAILURE;
}
// Read the file
vtkSmartPointer<vtkXMLPolyDataReader> reader =
vtkSmartPointer<vtkXMLPolyDataReader>::New();
reader->SetFileName( argv[1] );
reader->Update(); // Update so that we can get the scalar range
double scalarRange[2];
reader->GetOutput()->GetPointData()->GetScalars()->GetRange(scalarRange);
vtkSmartPointer<vtkAppendPolyData> appendFilledContours =
vtkSmartPointer<vtkAppendPolyData>::New();
// Check for a reasonable number of contours to avoid excessive
// computation. Here we arbitrarily pick an upper limit of 1000
int numberOfContours = atoi(argv[2]);
if (numberOfContours > 1000)
{
std::cout << "ERROR: the number of contours " << numberOfContours << " exceeds 1000" << std::endl;
return EXIT_FAILURE;
}
if (numberOfContours <= 0)
{
std::cout << "ERROR: the number of contours " << numberOfContours << " is <= 0" << std::endl;
return EXIT_FAILURE;
}
double delta =
(scalarRange[1] - scalarRange[0]) /
static_cast<double> (numberOfContours - 1);
// Keep the clippers alive
std::vector<vtkSmartPointer<vtkClipPolyData> > clippersLo;
std::vector<vtkSmartPointer<vtkClipPolyData> > clippersHi;
for (int i = 0; i < numberOfContours; i++)
{
double valueLo = scalarRange[0] + static_cast<double> (i) * delta;
double valueHi = scalarRange[0] + static_cast<double> (i + 1) * delta;
clippersLo.push_back(vtkSmartPointer<vtkClipPolyData>::New());
clippersLo[i]->SetValue(valueLo);
if (i == 0)
{
clippersLo[i]->SetInputConnection(reader->GetOutputPort());
}
else
{
clippersLo[i]->SetInputConnection(clippersHi[i - 1]->GetOutputPort(1));
}
clippersLo[i]->InsideOutOff();
clippersLo[i]->Update();
clippersHi.push_back(vtkSmartPointer<vtkClipPolyData>::New());
clippersHi[i]->SetValue(valueHi);
clippersHi[i]->SetInputConnection(clippersLo[i]->GetOutputPort());
clippersHi[i]->GenerateClippedOutputOn();
clippersHi[i]->InsideOutOn();
clippersHi[i]->Update();
if (clippersHi[i]->GetOutput()->GetNumberOfCells() == 0)
{
continue;
}
vtkSmartPointer<vtkFloatArray> cd =
vtkSmartPointer<vtkFloatArray>::New();
cd->SetNumberOfComponents(1);
cd->SetNumberOfTuples(clippersHi[i]->GetOutput()->GetNumberOfCells());
cd->FillComponent(0, valueLo);
clippersHi[i]->GetOutput()->GetCellData()->SetScalars(cd);
appendFilledContours->AddInputConnection(clippersHi[i]->GetOutputPort());
}
vtkSmartPointer<vtkCleanPolyData> filledContours =
vtkSmartPointer<vtkCleanPolyData>::New();
filledContours->SetInputConnection(appendFilledContours->GetOutputPort());
vtkSmartPointer<vtkLookupTable> lut =
vtkSmartPointer<vtkLookupTable>::New();
lut->SetNumberOfTableValues(numberOfContours + 1);
lut->Build();
vtkSmartPointer<vtkPolyDataMapper> contourMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
contourMapper->SetInputConnection(filledContours->GetOutputPort());
contourMapper->SetScalarRange(scalarRange[0], scalarRange[1]);
contourMapper->SetScalarModeToUseCellData();
contourMapper->SetLookupTable(lut);
vtkSmartPointer<vtkActor> contourActor =
vtkSmartPointer<vtkActor>::New();
contourActor->SetMapper(contourMapper);
contourActor->GetProperty()->SetInterpolationToFlat();
vtkSmartPointer<vtkContourFilter> contours =
vtkSmartPointer<vtkContourFilter>::New();
contours->SetInputConnection(filledContours->GetOutputPort());
contours->GenerateValues(numberOfContours, scalarRange[0], scalarRange[1]);
vtkSmartPointer<vtkPolyDataMapper> contourLineMapperer =
vtkSmartPointer<vtkPolyDataMapper>::New();
contourLineMapperer->SetInputConnection(contours->GetOutputPort());
contourLineMapperer->SetScalarRange(scalarRange[0], scalarRange[1]);
contourLineMapperer->ScalarVisibilityOff();
vtkSmartPointer<vtkActor> contourLineActor =
vtkSmartPointer<vtkActor>::New();
contourLineActor->SetMapper(contourLineMapperer);
contourLineActor->GetProperty()->SetLineWidth(2);
// The usual renderer, render window and interactor
vtkSmartPointer<vtkRenderer> ren1 =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderWindowInteractor>
iren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
ren1->SetBackground(.1, .2, .3);
renWin->AddRenderer(ren1);
iren->SetRenderWindow(renWin);
// Add the actors
ren1->AddActor(contourActor);
ren1->AddActor(contourLineActor);
// Begin interaction
renWin->Render();
iren->Start();
return EXIT_SUCCESS;
}
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