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index.js
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index.js
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/*
JSCAD Object to AutoCAD DXF Entity Serialization
## License
Copyright (c) 2018 Z3 Development https://github.com/z3dev
All code released under MIT license
Notes:
1) CAG conversion to:
POLYLINE
LWPOLYLINE
2) CSG conversion to:
3DFACE
POLYLINE (face mesh)
3) Path2D conversion to:
LWPOLYLINE
TBD
1) support binary output
2) add color conversion, and translation for CSG
*/
const {isCAG, isCSG} = require('@jscad/csg')
const {ensureManifoldness} = require('@jscad/io-utils')
const {dxfHeaders, dxfClasses, dxfTables, dxfBlocks, dxfObjects} = require('./autocad_AC2017')
const mimeType = 'application/dxf'
/** Serialize the give objects to AutoCad DXF format.
* @param {Object|Array} objects - objects to serialize as DXF
* @param {Object} [options] - options for serialization
* @returns {Array} serialized contents, DXF format
*/
const serialize = function (objects, options) {
const defaults = {
cagTo: 'lwpolyline', // or polyline
csgTo: '3dface', // or polyline
pathTo: 'lwpolyline',
statusCallback: null
}
options = Object.assign({}, defaults, options)
let dxfContent = `999
DXF generated by JSCAD
${dxfHeaders(options)}
${dxfClasses(options)}
${dxfTables(options)}
${dxfBlocks(options)}
${dxfEntities(objects, options)}
${dxfObjects(options)}
0
EOF
`
return [dxfContent]
}
/** Serialize the given objects as a DXF entity section
* @param {Array} objects - objects to serialize as DXF
* @param {Object} options - options for serialization
* @returns {Object} serialized contents, DXF format
*/
const dxfEntities = function (objects, options) {
objects = toArray(objects)
let entityContents = objects.map(function (object, i) {
if (isCAG(object)) {
let paths = object.getOutlinePaths()
if (options.cagTo === 'polyline') {
return PathsToPolyine(paths, options)
}
return PathsToLwpolyine(paths, options)
}
if (isCSG(object)) {
object = ensureManifoldness(object)
if (options.csgTo === 'polyline') {
return PolygonsToPolyline(object, options)
}
return PolygonsTo3DFaces(object, options)
}
if (isPath(object)) {
// mimic a CAG outline path
let points = object.getPoints()
let closed = object.isClosed()
let path = {closed: closed, points: points}
return PathsToLwpolyine([path], options)
}
return ''
})
let section = ` 0
SECTION
2
ENTITIES
`
entityContents.forEach(function (content) {
if (content) {
section += content
}
})
section += ` 0
ENDSEC`
return section
}
//
// convert the given paths (from CAG outlines) to DXF lwpolyline entities
// @return array of strings
//
// Group Codes Used:
// 5 - Handle, unique HEX value, e.g. 5C6
// 8 - layer name (0 is default layer)
// 67 (0 - model space, 1 - paper space)
// 100 -
//
const PathsToLwpolyine = function (paths, options) {
options.statusCallback && options.statusCallback({progress: 0})
let str = ''
paths.map(function (path, i) {
if (path.points.length < 1) return
let numpointsClosed = path.points.length + (path.closed ? 1 : 0)
str += ` 0
LWPOLYLINE
5
${getEntityId()}
100
AcDbEntity
8
0
67
0
100
AcDbPolyline
90
${numpointsClosed}
70
${(path.closed ? 1 : 0)}
`
for (let pointindex = 0; pointindex < numpointsClosed; pointindex++) {
let pointindexwrapped = pointindex
if (pointindexwrapped >= path.points.length) pointindexwrapped -= path.points.length
let point = path.points[pointindexwrapped]
str += ` 10
${point.x}
20
${point.y}
`
}
options.statusCallback && options.statusCallback({progress: 100 * i / paths.length})
})
options.statusCallback && options.statusCallback({progress: 100})
return [str]
}
//
// convert the given paths (from CAG outlines) to DXF polyline (2D line) entities
// @return array of strings
//
const PathsToPolyine = function (paths, options) {
options.statusCallback && options.statusCallback({progress: 0})
let str = ''
paths.map(function (path, i) {
let numpointsClosed = path.points.length + (path.closed ? 1 : 0)
str += ` 0
POLYLINE
5
${getEntityId()}
100
AcDbEntity
8
0
100
AcDb2dPolyline
`
for (let pointindex = 0; pointindex < numpointsClosed; pointindex++) {
let pointindexwrapped = pointindex
if (pointindexwrapped >= path.points.length) pointindexwrapped -= path.points.length
let point = path.points[pointindexwrapped]
str += ` 0
VERTEX
5
${getEntityId()}
100
AcDbEntity
8
0
100
AcDbVertex
100
AcDb2dVertex
10
${point.x}
20
${point.y}
`
}
str += ` 0
SEQEND
5
${getEntityId()}
100
AcDbEntity
`
options.statusCallback && options.statusCallback({progress: 100 * i / paths.length})
})
options.statusCallback && options.statusCallback({progress: 100})
return [str]
}
//
// convert the given CSG to DXF 3D face entities
// @return array of strings
//
const PolygonsTo3DFaces = function (csg, options) {
options.statusCallback && options.statusCallback({progress: 0})
let str = ''
csg.polygons.map(function (polygon, i) {
let triangles = polygonToTriangles(polygon)
triangles.map(function (triangle, i) {
str += triangleTo3DFaces(triangle, options)
})
})
options.statusCallback && options.statusCallback({progress: 100})
return [str]
}
//
// convert the given polygon to triangles
//
// NOTE: This only works for CONVEX polygons
const polygonToTriangles = (polygon) => {
let length = polygon.vertices.length - 2
if (length < 1) return []
let pivot = polygon.vertices[0]
let triangles = []
for (let i = 0; i < length; i++) {
triangles.push([pivot, polygon.vertices[i + 1], polygon.vertices[i + 2]])
}
return triangles
}
//
// convert the given triangle to DXF 3D face entity
//
const triangleTo3DFaces = (triangle, options) => {
let corner10 = triangle[0].pos
let corner11 = triangle[1].pos
let corner12 = triangle[2].pos
let corner13 = triangle[2].pos // same in DXF
let str = ` 0
3DFACE
5
${getEntityId()}
100
AcDbEntity
8
0
100
AcDbFace
70
0
10
${corner10.x}
20
${corner10.y}
30
${corner10.z}
11
${corner11.x}
21
${corner11.y}
31
${corner11.z}
12
${corner12.x}
22
${corner12.y}
32
${corner12.z}
13
${corner13.x}
23
${corner13.y}
33
${corner13.z}
`
return str
}
// convert the given CSG to DXF POLYLINE (polyface mesh)
// FIXME The entity types are wrong, resulting in imterpretation as a 3D lines, not faces
// @return array of strings
const PolygonsToPolyline = function (csg, options) {
options.statusCallback && options.statusCallback({progress: 100})
options.statusCallback && options.statusCallback({progress: 0})
let str = ''
let mesh = polygons2polyfaces(csg.polygons)
if (mesh.faces.length > 0) {
str += ` 0
POLYLINE
5
${getEntityId()}
100
AcDbEntity
8
0
100
AcDb3dPolyline
70
64
71
${mesh.vertices.length}
72
${mesh.faces.length}
`
mesh.vertices.forEach(function (vertex) {
str += ` 0
VERTEX
5
${getEntityId()}
100
AcDbEntity
8
0
100
AcDbVertex
100
AcDb3dPolylineVertex
10
${vertex[0]}
20
${vertex[1]}
30
${vertex[2]}
70
192
`
})
mesh.faces.forEach(function (face) {
str += ` 0
VERTEX
5
${getEntityId()}
100
AcDbEntity
8
0
100
AcDbVertex
100
AcDb3dPolylineVertex
10
0
20
0
30
0
70
128
71
${face[0]}
72
${face[1]}
73
${face[2]}
74
${face[3]}
`
})
}
return [str]
}
// convert the given polygons (CSG) to polyfaces (DXF)
// @return array of faces, array of vertices
const polygons2polyfaces = function (polygons) {
var faces = []
var vertices = []
for (var i = 0; i < polygons.length; ++i) {
let polygon = polygons[i]
var face = []
for (var j = 0; j < polygon.vertices.length; ++j) {
var vv = polygon.vertices[j].pos
vertices.push([vv.x, vv.y, vv.z])
face.push(vertices.length)
}
while (face.length < 4) { face.push(0) }
faces.push(face)
}
return {faces: faces, vertices: vertices}
}
// get a unique id for a DXF entity
// @return unique id string
var entityId = 0
function getEntityId () {
entityId++
// add more zeros if the id needs to be larger
let padded = '00000' + entityId.toString(16).toUpperCase()
return 'CAD' + padded.substr(padded.length - 5)
}
// convert the given data to array if not already
// @return array of data
function toArray (data) {
if (Array.isArray(data)) return data
return [data]
}
// determin if the given object is a Path2D object
// NOTE: Can be removed once CSG provides this functionality
// @return true or false
function isPath (object) {
if (object && 'points' in object && Array.isArray(object.points)) {
return true
}
return false
}
module.exports = {
serialize,
mimeType
}