Assemble Example Source Files

assemble.cpp

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 30
 31#include <tracktable/CommandLineFactories/AssemblerFromCommandLine.h>
 32#include <tracktable/CommandLineFactories/PointReaderFromCommandLine.h>
 33#include <tracktable/Domain/Terrestrial.h>
 34#include <tracktable/RW/TrajectoryWriter.h>
 35
 36#include <fstream>
 37
 38using TrajectoryT = tracktable::domain::terrestrial::trajectory_type;
 39using PointT = typename TrajectoryT::point_type;
 40using PointReaderT = tracktable::PointReader<PointT>;
 41using PointReaderIteratorT = typename PointReaderT::iterator;
 42using AssemblerT = tracktable::AssembleTrajectories<TrajectoryT, PointReaderIteratorT>;
 43
 44static constexpr auto helpmsg = R"(
 45--------------------------------------------------------------------------------
 46The assemble example demonstrates:
 47    - Using command line factories to read points and assemble trajectories
 48    - Writing trajectories to file for later use
 49
 50Typical use:
 51    ./assemble --input=/data/flights.tsv --output=/data/flights.trj
 52
 53Defaults assume a tab separated file formatted as :
 54
 55OBJECTID TIMESTAMP LON LAT
 56
 57Default output is standard out
 58--------------------------------------------------------------------------------)";
 59
 60int main(int _argc, char* _argv[]) {
 61  //Set log level to reduce unecessary output
 62  tracktable::set_log_level(tracktable::log::info);
 63  // Create a basic command line option with boost
 64  boost::program_options::options_description commandLineOptions;
 65  commandLineOptions.add_options()("help", "Print help");
 66
 67  // Create command line factories
 68  tracktable::PointReaderFromCommandLine<PointT> readerFactory;
 69  tracktable::AssemblerFromCommandLine<TrajectoryT> assemblerFactory;
 70  // Add options from the factories
 71  readerFactory.addOptions(commandLineOptions);
 72  assemblerFactory.addOptions(commandLineOptions);
 73
 74  // And a command line option for output
 75  commandLineOptions.add_options()("output", bpo::value<std::string>()->default_value("-"),
 76                                   "file to write to (use '-' for stdout), overridden by 'separate-kmls'");
 77
 78  /** Boost program options using a variable map to tie everything together.
 79   * one parse will have a single variable map. We need to let the factories know
 80   * about this variable map so they can pull information out of it */
 81  auto vm = std::make_shared<boost::program_options::variables_map>();
 82  readerFactory.setVariables(vm);
 83  assemblerFactory.setVariables(vm);
 84
 85  // Parse the command lines, don't forget the 'notify' after
 86  try {
 87    // We use this try/catch to automatically display help when an unknown option is used
 88    boost::program_options::store(
 89        boost::program_options::command_line_parser(_argc, _argv).options(commandLineOptions).run(), *vm);
 90    boost::program_options::notify(*vm);
 91  } catch (boost::program_options::error e) {
 92    std::cerr << e.what();
 93    std::cerr << helpmsg << "\n\n";
 94    std::cerr << commandLineOptions << std::endl;
 95    return 1;
 96  }
 97  /** Parsing will give an error of an incorrect option is used, but it won't
 98   * display the help unless we tell it too */
 99  if (vm->count("help") != 0) {
100    std::cerr << helpmsg << "\n\n";
101    std::cerr << commandLineOptions << std::endl;
102    return 1;
103  }
104
105  // Create Point Reader and assembler
106  auto pointReader = readerFactory.createPointReader();
107  auto assembler = assemblerFactory.createAssembler(pointReader);
108
109  // We default to standard out
110  std::ostream* o = &std::cout;
111  auto filename = (*vm)["output"].as<std::string>();
112  std::cerr << "Writing to ";
113  if ("-" != filename) {
114    // we swap in a file if a filename is specified
115    std::cerr << filename << std::endl;
116    o = new std::ofstream(filename);
117  } else {
118    std::cerr << "standard out" << std::endl;
119  }
120
121  // trajectory writer with default options
122  tracktable::TrajectoryWriter writer(*o);
123
124  auto count = 0u;
125  std::cerr << std::right;
126  // We don't need to bother storing trajectories, we can just write them
127  for (auto t = assembler->begin(); t != assembler->end(); ++t) {
128    writer.write(*t);
129    std::cerr << "\b\b\b\b\b\b\b\b\b\b" << std::setw(10)  // Using backspaces for in place counter
130              << count++;
131  }
132  std::cerr << std::endl;
133  return 0;
134}