formats.js

/*
## License

Copyright (c) 2014 bebbi (elghatta@gmail.com)
Copyright (c) 2013 Eduard Bespalov (edwbes@gmail.com)
Copyright (c) 2012 Joost Nieuwenhuijse (joost@newhouse.nl)
Copyright (c) 2011 Evan Wallace (http://evanw.github.com/csg.js/)
Copyright (c) 2012 Alexandre Girard (https://github.com/alx)

All code released under MIT license

*/

if (typeof module !== 'undefined') { // used via nodejs
  CSG = require(lib + 'csg.js').CSG;
  CAG = require(lib + 'csg.js').CAG;
}

////////////////////////////////////////////
// X3D Export
////////////////////////////////////////////

CSG.prototype.toX3D = function() {
  // materialPolygonLists
  // key: a color string (e.g. "0 1 1" for yellow)
  // value: an array of strings specifying polygons of this color
  //        (as space-separated indices into vertexCoords)
  var materialPolygonLists = {},
    // list of coordinates (as "x y z" strings)
    vertexCoords = [],
    // map to look up the index in vertexCoords of a given vertex
    vertexTagToCoordIndexMap = {};

  this.polygons.map(function(p) {
    var red = 0,
      green = 0,
      blue = 1; // default color is blue
    if (p.shared && p.shared.color) {
      red = p.shared.color[0];
      green = p.shared.color[1];
      blue = p.shared.color[2];
    }

    var polygonVertexIndices = [],
      numvertices = p.vertices.length,
      vertex;
    for (var i = 0; i < numvertices; i++) {
      vertex = p.vertices[i];
      if (!(vertex.getTag() in vertexTagToCoordIndexMap)) {
        vertexCoords.push(vertex.pos._x.toString() + " " +
          vertex.pos._y.toString() + " " +
          vertex.pos._z.toString()
        );
        vertexTagToCoordIndexMap[vertex.getTag()] = vertexCoords.length - 1;
      }
      polygonVertexIndices.push(vertexTagToCoordIndexMap[vertex.getTag()]);
    }

    var polygonString = polygonVertexIndices.join(" ");

    var colorString = red.toString() + " " + green.toString() + " " + blue.toString();
    if (!(colorString in materialPolygonLists)) {
      materialPolygonLists[colorString] = [];
    }
    // add this polygonString to the list of colorString-colored polygons
    materialPolygonLists[colorString].push(polygonString);
  });


  // create output document
  var docType = document.implementation.createDocumentType("X3D",
    'ISO//Web3D//DTD X3D 3.1//EN" "http://www.web3d.org/specifications/x3d-3.1.dtd', null);
  var exportDoc = document.implementation.createDocument(null, "X3D", docType);
  exportDoc.insertBefore(
    exportDoc.createProcessingInstruction('xml', 'version="1.0" encoding="UTF-8"'),
    exportDoc.doctype);

  var exportRoot = exportDoc.getElementsByTagName("X3D")[0];
  exportRoot.setAttribute("profile", "Interchange");
  exportRoot.setAttribute("version", "3.1");
  exportRoot.setAttribute("xsd:noNamespaceSchemaLocation", "http://www.web3d.org/specifications/x3d-3.1.xsd");
  exportRoot.setAttribute("xmlns:xsd", "http://www.w3.org/2001/XMLSchema-instance");

  var exportScene = exportDoc.createElement("Scene");
  exportRoot.appendChild(exportScene);

  /*
      For each color, create a shape made of an appropriately colored
      material which contains all polygons that are this color.

      The first shape will contain the definition of all vertices,
      (<Coordinate DEF="coords_mesh"/>), which will be referenced by
      subsequent shapes.
    */
  var coordsMeshDefined = false;
  for (var colorString in materialPolygonLists) {
    var polygonList = materialPolygonLists[colorString];
    var shape = exportDoc.createElement("Shape");
    exportScene.appendChild(shape);

    var appearance = exportDoc.createElement("Appearance");
    shape.appendChild(appearance);

    var material = exportDoc.createElement("Material");
    appearance.appendChild(material);
    material.setAttribute("diffuseColor", colorString);
    material.setAttribute("ambientIntensity", "1.0");

    var ifs = exportDoc.createElement("IndexedFaceSet");
    shape.appendChild(ifs);
    ifs.setAttribute("solid", "true");
    ifs.setAttribute("coordIndex", polygonList.join(" -1 ") + " -1");

    var coordinate = exportDoc.createElement("Coordinate");
    ifs.appendChild(coordinate);
    if (coordsMeshDefined) {
      coordinate.setAttribute("USE", "coords_mesh");
    } else {
      coordinate.setAttribute("DEF", "coords_mesh");
      coordinate.setAttribute("point", vertexCoords.join(" "));
      coordsMeshDefined = true;
    }
  }

  var x3dstring = (new XMLSerializer()).serializeToString(exportDoc);
  return new Blob([x3dstring], {
    type: "model/x3d+xml"
  });
};

////////////////////////////////////////////
// STL Binary Export
////////////////////////////////////////////

// see http://en.wikipedia.org/wiki/STL_%28file_format%29#Binary_STL
CSG.prototype.toStlBinary = function() {
  // first check if the host is little-endian:
  var buffer = new ArrayBuffer(4);
  var int32buffer = new Int32Array(buffer, 0, 1);
  var int8buffer = new Int8Array(buffer, 0, 4);
  int32buffer[0] = 0x11223344;
  if (int8buffer[0] != 0x44) {
    throw new Error("Binary STL output is currently only supported on little-endian (Intel) processors");
  }

  var numtriangles = 0;
  this.polygons.map(function(p) {
    var numvertices = p.vertices.length;
    var thisnumtriangles = (numvertices >= 3) ? numvertices - 2 : 0;
    numtriangles += thisnumtriangles;
  });
  var headerarray = new Uint8Array(80);
  for (var i = 0; i < 80; i++) {
    headerarray[i] = 65;
  }
  var ar1 = new Uint32Array(1);
  ar1[0] = numtriangles;
  // write the triangles to allTrianglesBuffer:
  var allTrianglesBuffer = new ArrayBuffer(50 * numtriangles);
  var allTrianglesBufferAsInt8 = new Int8Array(allTrianglesBuffer);
  // a tricky problem is that a Float32Array must be aligned at 4-byte boundaries (at least in certain browsers)
  // while each triangle takes 50 bytes. Therefore we write each triangle to a temporary buffer, and copy that
  // into allTrianglesBuffer:
  var triangleBuffer = new ArrayBuffer(50);
  var triangleBufferAsInt8 = new Int8Array(triangleBuffer);
  // each triangle consists of 12 floats:
  var triangleFloat32array = new Float32Array(triangleBuffer, 0, 12);
  // and one uint16:
  var triangleUint16array = new Uint16Array(triangleBuffer, 48, 1);
  var byteoffset = 0;
  this.polygons.map(function(p) {
    var numvertices = p.vertices.length;
    for (var i = 0; i < numvertices - 2; i++) {
      var normal = p.plane.normal;
      triangleFloat32array[0] = normal._x;
      triangleFloat32array[1] = normal._y;
      triangleFloat32array[2] = normal._z;
      var arindex = 3;
      for (var v = 0; v < 3; v++) {
        var vv = v + ((v > 0) ? i : 0);
        var vertexpos = p.vertices[vv].pos;
        triangleFloat32array[arindex++] = vertexpos._x;
        triangleFloat32array[arindex++] = vertexpos._y;
        triangleFloat32array[arindex++] = vertexpos._z;
      }
      triangleUint16array[0] = 0;
      // copy the triangle into allTrianglesBuffer:
      allTrianglesBufferAsInt8.set(triangleBufferAsInt8, byteoffset);
      byteoffset += 50;
    }
  });
  return new Blob([headerarray.buffer, ar1.buffer, allTrianglesBuffer], {
    type: "application/sla"
  });
};

////////////////////////////////////////////
// STL String Export
////////////////////////////////////////////

CSG.prototype.toStlString = function() {
  var result = "solid csg.js\n";
  this.polygons.map(function(p) {
    result += p.toStlString();
  });
  result += "endsolid csg.js\n";
  return result;
};

CSG.Vector3D.prototype.toStlString = function() {
  return this._x + " " + this._y + " " + this._z;
};

CSG.Vertex.prototype.toStlString = function() {
  return "vertex " + this.pos.toStlString() + "\n";
};

CSG.Polygon.prototype.toStlString = function() {
  var result = "";
  if (this.vertices.length >= 3) // should be!
  {
    // STL requires triangular polygons. If our polygon has more vertices, create
    // multiple triangles:
    var firstVertexStl = this.vertices[0].toStlString();
    for (var i = 0; i < this.vertices.length - 2; i++) {
      result += "facet normal " + this.plane.normal.toStlString() + "\nouter loop\n";
      result += firstVertexStl;
      result += this.vertices[i + 1].toStlString();
      result += this.vertices[i + 2].toStlString();
      result += "endloop\nendfacet\n";
    }
  }
  return result;
};

////////////////////////////////////////////
// DXF Export
////////////////////////////////////////////

CAG.PathsToDxf = function(paths) {
  var str = "999\nDXF generated by OpenJsCad\n";
  str += "  0\nSECTION\n  2\nHEADER\n";
  str += "  0\nENDSEC\n";
  str += "  0\nSECTION\n  2\nTABLES\n";
  str += "  0\nTABLE\n  2\nLTYPE\n  70\n1\n";
  str += "  0\nLTYPE\n  2\nCONTINUOUS\n  3\nSolid Line\n  72\n65\n  73\n0\n  40\n0.0\n";
  str += "  0\nENDTAB\n";
  str += "  0\nTABLE\n  2\nLAYER\n  70\n1\n";
  str += "  0\nLAYER\n  2\nOpenJsCad\n  62\n7\n  6\ncontinuous\n";
  str += "  0\nENDTAB\n";
  str += "  0\nTABLE\n  2\nSTYLE\n  70\n0\n  0\nENDTAB\n";
  str += "  0\nTABLE\n  2\nVIEW\n  70\n0\n  0\nENDTAB\n";
  str += "  0\nENDSEC\n";
  str += "  0\nSECTION\n  2\nBLOCKS\n";
  str += "  0\nENDSEC\n";
  str += "  0\nSECTION\n  2\nENTITIES\n";
  paths.map(function(path) {
    var numpoints_closed = path.points.length + (path.closed ? 1 : 0);
    str += "  0\nLWPOLYLINE\n  8\nOpenJsCad\n  90\n" + numpoints_closed + "\n  70\n" + (path.closed ? 1 : 0) + "\n";
    for (var pointindex = 0; pointindex < numpoints_closed; pointindex++) {
      var pointindexwrapped = pointindex;
      if (pointindexwrapped >= path.points.length) pointindexwrapped -= path.points.length;
      var point = path.points[pointindexwrapped];
      str += " 10\n" + point.x + "\n 20\n" + point.y + "\n 30\n0.0\n";
    }
  });
  str += "  0\nENDSEC\n  0\nEOF\n";

  // console.log(str)
  drawDXF(str, "OpenJSCAD")
  filldoctree();
  document.getElementById('dxf').value = str;

  return new Blob([str], {
    type: "application/dxf"
  });

};

CAG.prototype.toDxf = function() {
  var paths = this.getOutlinePaths();
  return CAG.PathsToDxf(paths);
};

////////////////////////////////////////////
// AMF Export
////////////////////////////////////////////

CSG.prototype.toAMFString = function(m) {
  var result = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<amf" + (m && m.unit ? " unit=\"+m.unit\"" : "") + ">\n";
  for (var k in m) {
    result += "<metadata type=\"" + k + "\">" + m[k] + "</metadata>\n";
  }
  result += "<object id=\"0\">\n<mesh>\n<vertices>\n";

  this.polygons.map(function(p) { // first we dump all vertices of all polygons
    for (var i = 0; i < p.vertices.length; i++) {
      result += p.vertices[i].toAMFString();
    }
  });
  result += "</vertices>\n";

  var n = 0;
  this.polygons.map(function(p) { // then we dump all polygons
    result += "<volume>\n";
    if (p.vertices.length < 3)
      return;
    var r = 1,
      g = 0.4,
      b = 1,
      a = 1,
      colorSet = false;
    if (p.shared && p.shared.color) {
      r = p.shared.color[0];
      g = p.shared.color[1];
      b = p.shared.color[2];
      a = p.shared.color[3];
      colorSet = true;
    } else if (p.color) {
      r = p.color[0];
      g = p.color[1];
      b = p.color[2];
      if (p.color.length() > 3) a = p.color[3];
      colorSet = true;
    }
    result += "<color><r>" + r + "</r><g>" + g + "</g><b>" + b + "</b>" + (a !== undefined ? "<a>" + a + "</a>" : "") + "</color>";

    for (var i = 0; i < p.vertices.length - 2; i++) { // making sure they are all triangles (triangular polygons)
      result += "<triangle>";
      result += "<v1>" + (n) + "</v1>";
      result += "<v2>" + (n + i + 1) + "</v2>";
      result += "<v3>" + (n + i + 2) + "</v3>";
      result += "</triangle>\n";
    }
    n += p.vertices.length;
    result += "</volume>\n";
  });
  result += "</mesh>\n</object>\n";
  result += "</amf>\n";
  return result;
};

CSG.Vector3D.prototype.toAMFString = function() {
  return "<x>" + this._x + "</x><y>" + this._y + "</y><z>" + this._z + "</z>";
};

CSG.Vertex.prototype.toAMFString = function() {
  return "<vertex><coordinates>" + this.pos.toAMFString() + "</coordinates></vertex>\n";
};