dxf.h

/******************************************************/
/*                                                    */
/* dxf.h - Drawing Exchange Format                    */
/*                                                    */
/******************************************************/
/* Copyright 2019,2020 Pierre Abbat.
 * This file is part of PerfectTIN.
 *
 * PerfectTIN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * PerfectTIN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License and Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * and Lesser General Public License along with PerfectTIN. If not, see
 * <http://www.gnu.org/licenses/>.
 */
#include <string>
#include <fstream>
#include <vector>
#include <array>
#include "boundrect.h"
#include "point.h"
#include "triangle.h"

struct TagRange
{
  int tag;
  int format;
  /* 000 00: invalid
   * 001 01: bool
   * 002 02: short
   * 004 04: int
   * 008 08: long long
   * 072 48: double
   * 128 80: string
   * 129 81: hex string representing binary chunk
   * 132 84: hex string representing int
   * Only 128 and 129 are stored as strings.
   * 132 is read as string, but stored as integer.
   */
};

int tagFormat(int tag);

class GroupCode
{
public:
  GroupCode();
  explicit GroupCode(int tag0);
  GroupCode(const GroupCode &b);
  GroupCode& operator=(const GroupCode &b);
  ~GroupCode();
  int tag; // short in binary file
  union
  {
    std::string str;
    double real;
    long long integer;
    bool flag;
  };
};

struct DxfLayer
{
  std::string name;
  int number;
  int color;
};

std::string hexEncodeInt(long long num);
GroupCode readDxfText(std::istream &file);
GroupCode readDxfBinary(std::istream &file);
void writeDxfText(std::ostream &file,GroupCode code);
void writeDxfBinary(std::ostream &file,GroupCode code);
std::vector<GroupCode> readDxfGroups(std::istream &file,bool mode); // true for text
std::vector<GroupCode> readDxfGroups(std::string filename);
void writeDxfGroups(std::ostream &file,std::vector<GroupCode> &codes,bool mode);
std::vector<std::array<xyz,3> > extractTriangles(std::vector<GroupCode> dxfData);
void dxfHeader(std::vector<GroupCode> &dxfData,BoundRect br);
void tableSection(std::vector<GroupCode> &dxfData,std::vector<DxfLayer> &layers);
void openEntitySection(std::vector<GroupCode> &dxfData);
void closeEntitySection(std::vector<GroupCode> &dxfData);
void dxfEnd(std::vector<GroupCode> &dxfData);
void insertTriangle(std::vector<GroupCode> &dxfData,triangle &tri,double outUnit);
void insertPolyline(std::vector<GroupCode> &dxfData,polyline &poly,DxfLayer &lay,double outUnit);