dxfToEggConverter.cxx

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/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file dxfToEggConverter.cxx
 * @author drose
 * @date 2004-05-04
 */

#include "dxfToEggConverter.h"
#include "dxfToEggLayer.h"
#include "eggData.h"

/**
 *
 */
DXFToEggConverter::
DXFToEggConverter() {
}

/**
 *
 */
DXFToEggConverter::
DXFToEggConverter(const DXFToEggConverter &copy) :
  SomethingToEggConverter(copy)
{
}

/**
 *
 */
DXFToEggConverter::
~DXFToEggConverter() {
}

/**
 * Allocates and returns a new copy of the converter.
 */
SomethingToEggConverter *DXFToEggConverter::
make_copy() {
  return new DXFToEggConverter(*this);
}


/**
 * Returns the English name of the file type this converter supports.
 */
std::string DXFToEggConverter::
get_name() const {
  return "DXF";
}

/**
 * Returns the common extension of the file type this converter supports.
 */
std::string DXFToEggConverter::
get_extension() const {
  return "dxf";
}

/**
 * Returns true if this file type can transparently load compressed files
 * (with a .pz extension), false otherwise.
 */
bool DXFToEggConverter::
supports_compressed() const {
  return true;
}

/**
 * Handles the reading of the input file and converting it to egg.  Returns
 * true if successful, false otherwise.
 */
bool DXFToEggConverter::
convert_file(const Filename &filename) {
  clear_error();

  if (_egg_data->get_coordinate_system() == CS_default) {
    _egg_data->set_coordinate_system(CS_zup_right);
  }

  process(filename);
  return !had_error();
}

/**
 *
 */
DXFLayer *DXFToEggConverter::
new_layer(const std::string &name) {
  return new DXFToEggLayer(name, get_egg_data());
}

/**
 * If the entity is a polygon, creates the corresponding egg polygon.
 */
void DXFToEggConverter::
done_entity() {
  if (_entity == EN_polyline) {
    // A Polyline is either an unclosed series of connected line segments, or
    // a closed polygon of arbitrary complexity.

    if ((_flags & PF_3d) == 0) {
      // it's a 2-d polygon; convert it to 3-d coordinates.
      ocs_2_wcs();
    }

    if (_flags & PF_closed) {
      // it's closed; create a polygon.
      nassertv(_layer!=nullptr);
      ((DXFToEggLayer *)_layer)->add_polygon(this);
    } else {
      // It's open; create a series of line segments.
      nassertv(_layer!=nullptr);
      ((DXFToEggLayer *)_layer)->add_line(this);
    }

  } else if (_entity == EN_3dface) {
    // DXF can also represent a polygon as a 3DFace.  This might be either a
    // quad or a triangle (if two of the vertices are the same).  We'll add
    // the vertices to our list of vertices and then define the polygon.
    _verts.clear();
    _verts.push_back(DXFVertex(_s));
    _verts.push_back(DXFVertex(_r));
    _verts.push_back(DXFVertex(_q));
    _verts.push_back(DXFVertex(_p));

    nassertv(_layer!=nullptr);
    ((DXFToEggLayer *)_layer)->add_polygon(this);
  }
}

/**
 * A hook for user code, if desired.  This function is called when some
 * unexpected error occurs while reading the DXF file.
 */
void DXFToEggConverter::
error() {
  _error = true;
}