// This file is part of libigl, a simple c++ geometry processing library.
// 
// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
// 
// This Source Code Form is subject to the terms of the Mozilla Public License 
// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_READTGF_H
#define IGL_READTGF_H
#include "igl_inline.h"

#include <vector>
#include <string>
#ifndef IGL_NO_EIGEN
#include <Eigen/Dense>
#endif
/// @file readTGF.h
///
/// .tgf - control handle graphs
/// ============================
/// 
/// ------------------------------------------------------------------------
/// 
/// A .tgf file contains a graph of describing a set of control handles/structures: point controls, bones of a skeleton and cages made of "cage edges".
/// 
/// The first part of the file consists of lines regarding each vertex of the graph. Each line reads:
/// 
///     [index] [x] [y] [z] [undocument optional data]
/// 
/// Indices begin with 1 and should proceed in order. Then there should be a line with a sole:
/// 
///     #
/// 
/// The next section concerns the edges of the graph. Each line corresponds to an edge:
/// 
///     [source index] [dest index] [is bone] [is pseudo-edge] [is cage edge] [undocument other data]
/// 
/// Bone edges trump pseudo and cage edges.

namespace igl
{
  /// Read a graph from a .tgf file
  ///
  /// Input:
  ///  filename  .tgf file name
  /// Output:
  ///  V  # vertices by 3 list of vertex positions
  ///  E  # edges by 2 list of edge indices
  ///  P  # point-handles list of point handle indices
  ///  BE # bone-edges by 2 list of bone-edge indices
  ///  CE # cage-edges by 2 list of cage-edge indices
  ///  PE # pseudo-edges by 2 list of pseudo-edge indices
  /// 
  /// Assumes that graph vertices are 3 dimensional
  IGL_INLINE bool readTGF(
    const std::string tgf_filename,
    std::vector<std::vector<double> > & C,
    std::vector<std::vector<int> > & E,
    std::vector<int> & P,
    std::vector<std::vector<int> > & BE,
    std::vector<std::vector<int> > & CE,
    std::vector<std::vector<int> > & PE);
  /// \overload
  IGL_INLINE bool readTGF(
    const std::string tgf_filename,
    Eigen::MatrixXd & C,
    Eigen::MatrixXi & E,
    Eigen::VectorXi & P,
    Eigen::MatrixXi & BE,
    Eigen::MatrixXi & CE,
    Eigen::MatrixXi & PE);
  /// \overload
  IGL_INLINE bool readTGF(
    const std::string tgf_filename,
    Eigen::MatrixXd & C,
    Eigen::MatrixXi & E);
}

#ifndef IGL_STATIC_LIBRARY
#  include "readTGF.cpp"
#endif

#endif