oh_my_loam/common/utils.h

#pragma once

#include "color.h"
#include "log.h"
#include "types.h"

namespace oh_my_loam {

template <typename PointT>
inline double DistanceSqure(const PointT& pt) {
  return pt.x * pt.x + pt.y * pt.y + pt.z * pt.z;
}

template <typename PointT>
inline double DistanceSqure(const PointT& pt1, const PointT& pt2) {
  return (pt1.x - pt2.x) * (pt1.x - pt2.x) + (pt1.y - pt2.y) * (pt1.y - pt2.y) +
         (pt1.z - pt2.z) * (pt1.z - pt2.z);
}

template <typename PointT>
inline double Distance(const PointT& pt) {
  return std::sqrt(DistanceSqure(pt));
}

template <typename PointT>
inline double Distance(const PointT& pt1, const PointT& pt2) {
  return std::sqrt(DistanceSqure(pt1, pt2));
}

template <typename PointT>
inline double IsFinite(const PointT& pt) {
  return std::isfinite(pt.x) && std::isfinite(pt.y) && std::isfinite(pt.z);
}

// normalize an angle to [-pi, pi)
double NormalizeAngle(double ang);

// like Python built-in range, [begin, end)
const std::vector<int> Range(int begin, int end, int step = 1);
const std::vector<int> Range(int end);  // [0, end)

template <typename PointT>
void RemovePointsIf(const pcl::PointCloud<PointT>& cloud_in,
                    pcl::PointCloud<PointT>* const cloud_out,
                    std::function<bool(const PointT&)> cond) {
  if (&cloud_in != cloud_out) {
    cloud_out->header = cloud_in.header;
    cloud_out->points.resize(cloud_in.size());
  }
  size_t j = 0;
  for (size_t i = 0; i < cloud_in.size(); ++i) {
    const auto pt = cloud_in.points[i];
    if (cond(pt)) continue;
    cloud_out->points[j++] = pt;
  }

  cloud_out->points.resize(j);
  cloud_out->height = 1;
  cloud_out->width = static_cast<uint32_t>(j);
  cloud_out->is_dense = true;
}

template <typename PointT>
void RemoveNaNPoint(const pcl::PointCloud<PointT>& cloud_in,
                    pcl::PointCloud<PointT>* const cloud_out) {
  RemovePointsIf<PointT>(cloud_in, cloud_out,
                         [](const PointT& pt) { return !IsFinite(pt); });
}

template <typename PointT>
void RemoveClosedPoints(const pcl::PointCloud<PointT>& cloud_in,
                        pcl::PointCloud<PointT>* const cloud_out,
                        double min_dist = 0.1) {
  RemovePointsIf<PointT>(cloud_in, cloud_out, [&](const PointT& pt) {
    return DistanceSqure(pt) < min_dist * min_dist;
  });
}

template <typename PointT>
void VoxelDownSample(const pcl::PointCloud<PointT>& cloud_in,
                     pcl::PointCloud<PointT>* const cloud_out,
                     double voxel_size) {
  pcl::VoxelGrid<PointT> filter;
  filter.setInputCloud(cloud_in.makeShared());
  filter.setLeafSize(voxel_size, voxel_size, voxel_size);
  filter.filter(*cloud_out);
}

}  // namespace oh_my_loam