VtkCompositePointToGlyphFilter.cpp

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// ** INCLUDES **
#include "VtkCompositePointToGlyphFilter.h"
 
#include <vtkDataSetAlgorithm.h>
#include <vtkGlyph3D.h>
#include <vtkPointData.h>
#include <vtkSphereSource.h>
 
VtkCompositePointToGlyphFilter::VtkCompositePointToGlyphFilter(
    vtkAlgorithm* inputAlgorithm)
    : VtkCompositeFilter(inputAlgorithm), _glyphSource(nullptr)
{
    this->init();
}
 
VtkCompositePointToGlyphFilter::~VtkCompositePointToGlyphFilter()
{
    _glyphSource->Delete();
}
 
void VtkCompositePointToGlyphFilter::init()
{
    this->_inputDataObjectType = VTK_DATA_SET;
    this->_outputDataObjectType = VTK_POLY_DATA;
 
    std::size_t nPoints = static_cast<vtkDataSetAlgorithm*>(_inputAlgorithm)
                              ->GetOutput()
                              ->GetPointData()
                              ->GetNumberOfTuples();
    int phi(10 - static_cast<std::size_t>(nPoints / 2000.0));
    int theta(phi);
    if (phi < 4)
    {
        phi = 4;
        theta =
            4;  // for theta 3 would be possible, too, but 4 looks much better
    }
 
    double default_radius(GetInitialRadius());
    _glyphSource = vtkSphereSource::New();
    _glyphSource->SetRadius(default_radius);
    _glyphSource->SetPhiResolution(phi);
    _glyphSource->SetThetaResolution(theta);
    (*_algorithmUserProperties)["Radius"] = default_radius;
 
    (*_algorithmUserProperties)["PhiResolution"] = phi;
    (*_algorithmUserProperties)["ThetaResolution"] = theta;
 
    vtkGlyph3D* glyphFilter = vtkGlyph3D::New();
    glyphFilter
        ->ScalingOn();  // KR important to scale glyphs with double precision
                        // (e.g. 0.1 of their size for small datasets)
    // glyphFilter->SetScaleModeToScaleByScalar();  // KR can easily obscure
    // view when scalar values have large differences (this is also the default
    // scaling method)
    glyphFilter->SetScaleModeToDataScalingOff();  // KR scaling is possible but
                                                  // scalar values are ignored
    glyphFilter->SetScaleFactor(1.0);
    glyphFilter->SetSourceConnection(_glyphSource->GetOutputPort());
    glyphFilter->SetInputConnection(_inputAlgorithm->GetOutputPort());
    //(*_algorithmUserProperties)["ScaleMode"] = 0;
    //(*_algorithmUserProperties)["ScaleFactor"] = 1.0;
    //(*_algorithmUserProperties)["ColorMode"] = glyphFilter->GetColorMode();
    //(*_algorithmUserProperties)["VectorMode"] = glyphFilter->GetVectorMode();
    //(*_algorithmUserProperties)["Orient"] = glyphFilter->GetOrient();
 
    _outputAlgorithm = glyphFilter;
}
 
void VtkCompositePointToGlyphFilter::SetUserProperty(QString name,
                                                     QVariant value)
{
    VtkAlgorithmProperties::SetUserProperty(name, value);
 
    if (name.compare("Radius") == 0)
    {
        _glyphSource->SetRadius(value.toDouble());
    }
    else if (name.compare("PhiResolution") == 0)
    {
        _glyphSource->SetPhiResolution(value.toInt());
    }
    else if (name.compare("ThetaResolution") == 0)
    {
        _glyphSource->SetThetaResolution(value.toInt());
    }
    else if (name.compare("ScaleMode") == 0)
    {
        static_cast<vtkGlyph3D*>(_outputAlgorithm)->SetScaleMode(value.toInt());
    }
    else if (name.compare("ScaleFactor") == 0)
    {
        static_cast<vtkGlyph3D*>(_outputAlgorithm)
            ->SetScaleFactor(value.toDouble());
    }
    else if (name.compare("ColorMode") == 0)
    {
        static_cast<vtkGlyph3D*>(_outputAlgorithm)->SetColorMode(value.toInt());
    }
    else if (name.compare("VectorMode") == 0)
    {
        static_cast<vtkGlyph3D*>(_outputAlgorithm)
            ->SetVectorMode(value.toInt());
    }
    else if (name.compare("Orient") == 0)
    {
        static_cast<vtkGlyph3D*>(_outputAlgorithm)->SetOrient(value.toBool());
    }
}