VtkCompositeThresholdFilter.cpp

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// ** INCLUDES **
#include "VtkCompositeThresholdFilter.h"
 
#include <vtkCellData.h>
#include <vtkThreshold.h>
#include <vtkUnstructuredGrid.h>
 
#include "BaseLib/Logging.h"
 
VtkCompositeThresholdFilter::VtkCompositeThresholdFilter(
    vtkAlgorithm* inputAlgorithm)
    : VtkCompositeFilter(inputAlgorithm)
{
    this->init();
}
 
VtkCompositeThresholdFilter::~VtkCompositeThresholdFilter() = default;
 
void VtkCompositeThresholdFilter::init()
{
    // Set meta information about input and output data types
    this->_inputDataObjectType = VTK_DATA_SET;
    this->_outputDataObjectType = VTK_UNSTRUCTURED_GRID;
 
    // Because this is the only filter here we cannot use vtkSmartPointer
    vtkThreshold* threshold = vtkThreshold::New();
    threshold->SetInputConnection(_inputAlgorithm->GetOutputPort());
 
    // Use first array of parent as input array
    _inputAlgorithm->Update();
    vtkDataSet* dataSet =
        vtkDataSet::SafeDownCast(_inputAlgorithm->GetOutputDataObject(0));
    vtkDataSetAttributes* pointAttributes =
        dataSet->GetAttributes(vtkDataObject::AttributeTypes::POINT);
    vtkDataSetAttributes* cellAttributes =
        dataSet->GetAttributes(vtkDataObject::AttributeTypes::CELL);
    if (pointAttributes->GetNumberOfArrays() > 0)
    {
        threshold->SetInputArrayToProcess(
            0, 0, 0, vtkDataObject::FIELD_ASSOCIATION_POINTS,
            pointAttributes->GetArray(0)->GetName());
    }
    else if (cellAttributes->GetNumberOfArrays() > 0)
    {
        threshold->SetInputArrayToProcess(
            0, 0, 0, vtkDataObject::FIELD_ASSOCIATION_CELLS,
            cellAttributes->GetArray(0)->GetName());
    }
    else
    {
        WARN("Threshold filter could not find an array on its input object!");
        return;
    }
 
    // Sets a filter property which will be user editable
    threshold->SetSelectedComponent(0);
 
    // Setting the threshold to min / max values to ensure that the whole data
    // is first processed. This is needed for correct lookup table generation.
    const double dMin = std::numeric_limits<double>::lowest();
    const double dMax = std::numeric_limits<double>::max();
    threshold->SetThresholdFunction(
        vtkThreshold::ThresholdType::THRESHOLD_BETWEEN);
    threshold->SetLowerThreshold(dMin);
    threshold->SetUpperThreshold(dMax);
 
    // Create a list for the ThresholdBetween (vector) property.
    QList<QVariant> thresholdRangeList;
    // Insert the values (same values as above)
    thresholdRangeList.push_back(dMin);
    thresholdRangeList.push_back(dMax);
    // Put that list in the property map
    (*_algorithmUserVectorProperties)["Range"] = thresholdRangeList;
 
    // Make a new entry in the property map for the SelectedComponent property
    (*_algorithmUserProperties)["Selected Component"] = 0;
 
    // Must all scalars match the criterium
    threshold->SetAllScalars(1);
    (*_algorithmUserProperties)["Evaluate all points"] = true;
 
    // The threshold filter is last one and so it is also the _outputAlgorithm
    _outputAlgorithm = threshold;
}
 
void VtkCompositeThresholdFilter::SetUserProperty(QString name, QVariant value)
{
    VtkAlgorithmProperties::SetUserProperty(name, value);
 
    // Use the same name as in init()
    if (name.compare("Selected Component") == 0)
    {
        // Set the property on the algorithm
        static_cast<vtkThreshold*>(_outputAlgorithm)
            ->SetSelectedComponent(value.toInt());
    }
    else if (name.compare("Evaluate all points") == 0)
    {
        static_cast<vtkThreshold*>(_outputAlgorithm)
            ->SetAllScalars(value.toBool());
    }
}
 
void VtkCompositeThresholdFilter::SetUserVectorProperty(QString name,
                                                        QList<QVariant> values)
{
    VtkAlgorithmProperties::SetUserVectorProperty(name, values);
 
    // Use the same name as in init()
    if (name.compare("Range") == 0)
    {
        // Set the vector property on the algorithm
        static_cast<vtkThreshold*>(_outputAlgorithm)
            ->SetThresholdFunction(
                vtkThreshold::ThresholdType::THRESHOLD_BETWEEN);
        static_cast<vtkThreshold*>(_outputAlgorithm)
            ->SetLowerThreshold(values[0].toDouble());
        static_cast<vtkThreshold*>(_outputAlgorithm)
            ->SetUpperThreshold(values[1].toDouble());
    }
}