VtkCustomInteractorStyle.cpp

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
// ** INCLUDES **
#include "VtkCustomInteractorStyle.h"
 
#include <vtkActor.h>
#include <vtkAlgorithmOutput.h>
#include <vtkCamera.h>
#include <vtkCellData.h>
#include <vtkCellPicker.h>
#include <vtkDataSetMapper.h>
#include <vtkExtractSelection.h>
#include <vtkIdTypeArray.h>
#include <vtkObjectFactory.h>
#include <vtkProp.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRendererCollection.h>
#include <vtkSelection.h>
#include <vtkSelectionNode.h>
#include <vtkSmartPointer.h>
#include <vtkUnstructuredGrid.h>
#include <vtkUnstructuredGridAlgorithm.h>
 
#include <string>
 
#include "BaseLib/Logging.h"
#include "VtkCompositeElementSelectionFilter.h"
 
vtkStandardNewMacro(VtkCustomInteractorStyle);
 
VtkCustomInteractorStyle::VtkCustomInteractorStyle()
{
    _selectedMapper = vtkDataSetMapper::New();
    _selectedActor = vtkActor::New();
    _selectedActor->SetMapper(_selectedMapper);
    _selectedActor->GetProperty()->EdgeVisibilityOn();
    _selectedActor->GetProperty()->SetEdgeColor(1, 0, 0);
    _selectedActor->GetProperty()->SetLineWidth(3);
}
 
VtkCustomInteractorStyle::~VtkCustomInteractorStyle()
{
    _selectedActor->Delete();
    _selectedMapper->Delete();
}
 
void VtkCustomInteractorStyle::OnChar()
{
    switch (Interactor->GetKeyCode())
    {
        case '3':
            INFO("The 3 key was pressed.");
            break;
        case 'a':
            break;
        default:
            vtkInteractorStyleTrackballCamera::OnChar();
    }
}
 
void VtkCustomInteractorStyle::OnKeyDown()
{
    switch (Interactor->GetKeyCode())
    {
        case 32:  // Space
            _alternateMouseActions = true;
            emit cursorChanged(Qt::CrossCursor);
            break;
        default:
            vtkInteractorStyleTrackballCamera::OnKeyDown();
    }
}
 
void VtkCustomInteractorStyle::OnKeyUp()
{
    switch (Interactor->GetKeyCode())
    {
        case 32:  // Space
            _alternateMouseActions = false;
            emit cursorChanged(Qt::ArrowCursor);
            break;
        default:
            vtkInteractorStyleTrackballCamera::OnKeyUp();
    }
}
 
void VtkCustomInteractorStyle::highlightActor(vtkProp3D* actor)
{
    if (_highlightActor)
    {
        HighlightProp((vtkProp*)actor);
    }
}
 
void VtkCustomInteractorStyle::removeHighlightActor()
{
    this->Interactor->GetRenderWindow()
        ->GetRenderers()
        ->GetFirstRenderer()
        ->RemoveActor(_selectedActor);
}
 
void VtkCustomInteractorStyle::setHighlightActor(bool on)
{
    _highlightActor = on;
    if (!on)
    {
        HighlightProp((vtkProp*)nullptr);
    }
}
 
void VtkCustomInteractorStyle::pickableDataObject(vtkDataObject* object)
{
    _data = object;
    if (!object)
    {
        this->Interactor->GetRenderWindow()
            ->GetRenderers()
            ->GetFirstRenderer()
            ->RemoveActor(_selectedActor);
        _selectedMapper->SetInputConnection(nullptr);
    }
}
 
// From https://kitware.github.io/vtk-examples/site/Cxx/Picking/CellPicking/
void VtkCustomInteractorStyle::OnLeftButtonDown()
{
    if (!_data)
    {
        return vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
    }
 
    if (_alternateMouseActions)
    {
        // Get the location of the click (in window coordinates)
        int* pos = this->GetInteractor()->GetEventPosition();
 
        vtkSmartPointer<vtkCellPicker> picker =
            vtkSmartPointer<vtkCellPicker>::New();
        picker->SetTolerance(0.0005);
 
        // Pick from this location.
        picker->Pick(pos[0], pos[1], 0, this->GetDefaultRenderer());
 
        double* worldPosition = picker->GetPickPosition();
        INFO("Cell id is: {:d}", picker->GetCellId());
 
        if (picker->GetCellId() != -1)
        {
            INFO("Pick position is: {:f} {:f} {:f}", worldPosition[0],
                 worldPosition[1], worldPosition[2]);
 
            vtkSmartPointer<vtkIdTypeArray> ids =
                vtkSmartPointer<vtkIdTypeArray>::New();
            ids->SetNumberOfValues(1);
            ids->SetValue(0, picker->GetCellId());
 
            vtkSmartPointer<vtkSelectionNode> selectionNode =
                vtkSmartPointer<vtkSelectionNode>::New();
            selectionNode->SetFieldType(vtkSelectionNode::CELL);
            selectionNode->SetContentType(vtkSelectionNode::INDICES);
            selectionNode->SetSelectionList(ids);
 
            vtkSmartPointer<vtkSelection> selection =
                vtkSmartPointer<vtkSelection>::New();
            selection->AddNode(selectionNode);
 
            vtkSmartPointer<vtkExtractSelection> extractSelection =
                vtkSmartPointer<vtkExtractSelection>::New();
            extractSelection->SetInputData(0, _data);
            extractSelection->SetInputData(1, selection);
            extractSelection->Update();
 
            // In selection
            vtkSmartPointer<vtkUnstructuredGrid> selected =
                vtkSmartPointer<vtkUnstructuredGrid>::New();
            selected->ShallowCopy(extractSelection->GetOutput());
 
            INFO("There are {:d} points in the selection.",
                 selected->GetNumberOfPoints());
            INFO("There are {:d} cells in the selection.",
                 selected->GetNumberOfCells());
 
            // check if the underlying object is a mesh and if so, send a signal
            // to the element model for display of information about the picked
            // element.
            vtkAlgorithm* data_set = picker->GetActor()
                                         ->GetMapper()
                                         ->GetInputConnection(0, 0)
                                         ->GetProducer()
                                         ->GetInputConnection(0, 0)
                                         ->GetProducer();
            auto* source =
                dynamic_cast<vtkUnstructuredGridAlgorithm*>(data_set);
            if (source)
            {
                emit elementPicked(source,
                                   static_cast<unsigned>(picker->GetCellId()));
            }
            else
            {
                emit clearElementView();
            }
            _selectedMapper->SetInputData(selected);
 
            this->Interactor->GetRenderWindow()
                ->GetRenderers()
                ->GetFirstRenderer()
                ->AddActor(_selectedActor);
            //_highlightActor = true;
        }
        else
        {
            this->Interactor->GetRenderWindow()
                ->GetRenderers()
                ->GetFirstRenderer()
                ->RemoveActor(_selectedActor);
        }
        emit requestViewUpdate();
    }
    else
    {
        // Forward events
        vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
    }
}
 
void VtkCustomInteractorStyle::OnRightButtonDown()
{
    if (!_data)
    {
        return vtkInteractorStyleTrackballCamera::OnRightButtonDown();
    }
 
    if (_alternateMouseActions)
    {
        // Get the location of the click (in window coordinates)
        int* pos = this->GetInteractor()->GetEventPosition();
 
        vtkSmartPointer<vtkCellPicker> picker =
            vtkSmartPointer<vtkCellPicker>::New();
        picker->SetTolerance(0.0005);
 
        // Pick from this location.
        picker->Pick(pos[0], pos[1], 0, this->GetDefaultRenderer());
 
        double* worldPosition = picker->GetPickPosition();
        INFO("Cell id is: {:d}", picker->GetCellId());
 
        if (picker->GetCellId() != -1)
        {
            vtkRenderer* renderer = this->Interactor->GetRenderWindow()
                                        ->GetRenderers()
                                        ->GetFirstRenderer();
            vtkCamera* cam = renderer->GetActiveCamera();
            cam->SetFocalPoint(worldPosition);
            emit requestViewUpdate();
        }
    }
    else
    {
        // Forward events
        vtkInteractorStyleTrackballCamera::OnRightButtonDown();
    }
}