/*
 * Software License Agreement (BSD License)
 *
 *  Point Cloud Library (PCL) - www.pointclouds.org
 *  Copyright (c) 2012, Willow Garage, Inc.
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#include <pcl/apps/modeler/cloud_mesh.h>
#include <pcl/apps/modeler/normals_actor_item.h>
#include <pcl/filters/filter_indices.h>

#include <vtkCellArray.h>
#include <vtkDataSetMapper.h>
#include <vtkLODActor.h>
#include <vtkPointData.h>
#include <vtkPolyData.h>

//////////////////////////////////////////////////////////////////////////////////////////////
pcl::modeler::NormalsActorItem::NormalsActorItem(
    QTreeWidgetItem* parent,
    const CloudMesh::Ptr& cloud_mesh,
    const vtkSmartPointer<vtkRenderWindow>& render_window)
: ChannelActorItem(
      parent, cloud_mesh, render_window, vtkSmartPointer<vtkLODActor>::New(), "Normals")
, level_(10)
, scale_(0.1)
{}

//////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::modeler::NormalsActorItem::createNormalLines()
{
  vtkPoints* points = poly_data_->GetPoints();
  vtkCellArray* lines = poly_data_->GetLines();
  lines->Reset();

  CloudMesh::PointCloudConstPtr cloud = cloud_mesh_->getCloud();
  if (cloud->empty())
    return;

  if (points->GetData() == nullptr)
    points->SetData(vtkSmartPointer<vtkFloatArray>::New());

  vtkFloatArray* data = dynamic_cast<vtkFloatArray*>(points->GetData());
  data->SetNumberOfComponents(3);

  if (cloud->is_dense) {
    vtkIdType nr_normals = static_cast<vtkIdType>((cloud->size() - 1) / level_ + 1);
    data->SetNumberOfValues(2 * 3 * nr_normals);
    for (vtkIdType i = 0, j = 0; j < nr_normals;
         j++, i = static_cast<vtkIdType>(j * level_)) {
      const CloudMesh::PointT& p = (*cloud)[i];
      data->SetValue(2 * j * 3 + 0, p.x);
      data->SetValue(2 * j * 3 + 1, p.y);
      data->SetValue(2 * j * 3 + 2, p.z);
      data->SetValue(2 * j * 3 + 3, float(p.x + p.normal_x * scale_));
      data->SetValue(2 * j * 3 + 4, float(p.y + p.normal_y * scale_));
      data->SetValue(2 * j * 3 + 5, float(p.z + p.normal_z * scale_));

      lines->InsertNextCell(2);
      lines->InsertCellPoint(2 * j);
      lines->InsertCellPoint(2 * j + 1);
    }
  }
  else {
    pcl::IndicesPtr indices(new pcl::Indices());
    pcl::removeNaNFromPointCloud(*cloud, *indices);

    vtkIdType nr_normals = static_cast<vtkIdType>((indices->size() - 1) / level_ + 1);
    data->SetNumberOfValues(2 * 3 * nr_normals);
    for (vtkIdType i = 0, j = 0; j < nr_normals;
         j++, i = static_cast<vtkIdType>(j * level_)) {
      const CloudMesh::PointT& p = (*cloud)[(*indices)[i]];
      data->SetValue(2 * j * 3 + 0, p.x);
      data->SetValue(2 * j * 3 + 1, p.y);
      data->SetValue(2 * j * 3 + 2, p.z);
      data->SetValue(2 * j * 3 + 3, float(p.x + p.normal_x * scale_));
      data->SetValue(2 * j * 3 + 4, float(p.y + p.normal_y * scale_));
      data->SetValue(2 * j * 3 + 5, float(p.z + p.normal_z * scale_));

      lines->InsertNextCell(2);
      lines->InsertCellPoint(2 * j);
      lines->InsertCellPoint(2 * j + 1);
    }
  }
}

//////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::modeler::NormalsActorItem::initImpl()
{
  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
  points->SetDataTypeToFloat();
  vtkSmartPointer<vtkCellArray> lines = vtkSmartPointer<vtkCellArray>::New();

  poly_data_->SetPoints(points);
  poly_data_->SetLines(lines);

  createNormalLines();

  vtkSmartPointer<vtkDataSetMapper> mapper = vtkSmartPointer<vtkDataSetMapper>::New();
  mapper->SetInputData(poly_data_);

  vtkSmartPointer<vtkDataArray> scalars;
  cloud_mesh_->getColorScalarsFromField(scalars, color_scheme_);
  poly_data_->GetPointData()->SetScalars(scalars);
  double minmax[2];
  scalars->GetRange(minmax);
  mapper->SetScalarRange(minmax);

  mapper->SetColorModeToMapScalars();
  mapper->SetScalarModeToUsePointData();

  vtkSmartPointer<vtkLODActor> actor =
      vtkSmartPointer<vtkLODActor>(dynamic_cast<vtkLODActor*>(actor_.GetPointer()));
  actor->SetMapper(mapper);
}

//////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::modeler::NormalsActorItem::updateImpl()
{
  createNormalLines();

  vtkSmartPointer<vtkDataArray> scalars;
  cloud_mesh_->getColorScalarsFromField(scalars, color_scheme_);
  poly_data_->GetPointData()->SetScalars(scalars);
  double minmax[2];
  scalars->GetRange(minmax);
  actor_->GetMapper()->SetScalarRange(minmax);
}

//////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::modeler::NormalsActorItem::prepareContextMenu(QMenu*) const
{}

//////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::modeler::NormalsActorItem::prepareProperties(ParameterDialog*)
{}

//////////////////////////////////////////////////////////////////////////////////////////////
void
pcl::modeler::NormalsActorItem::setProperties()
{}
