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dxf-parser

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Parse dxf files into a readable, logical js object.

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import * as helpers from '../ParseHelpers'; export default class Lwpolyline { constructor() { this.ForEntityName = 'LWPOLYLINE'; } parseEntity(scanner, curr) { const entity = { type: curr.value, vertices: [] }; let numberOfVertices = 0; curr = scanner.next(); while (!scanner.isEOF()) { if (curr.code === 0) break; switch (curr.code) { case 38: entity.elevation = curr.value; break; case 39: entity.depth = curr.value; break; case 70: // 1 = Closed shape, 128 = plinegen?, 0 = default entity.shape = ((curr.value & 1) === 1); entity.hasContinuousLinetypePattern = ((curr.value & 128) === 128); break; case 90: numberOfVertices = curr.value; break; case 10: // X coordinate of point entity.vertices = parseLWPolylineVertices(numberOfVertices, scanner); break; case 43: if (curr.value !== 0) entity.width = curr.value; break; case 210: entity.extrusionDirectionX = curr.value; break; case 220: entity.extrusionDirectionY = curr.value; break; case 230: entity.extrusionDirectionZ = curr.value; break; default: helpers.checkCommonEntityProperties(entity, curr, scanner); break; } curr = scanner.next(); } return entity; } } function parseLWPolylineVertices(n, scanner) { if (!n || n <= 0) throw Error('n must be greater than 0 verticies'); const vertices = []; let vertexIsStarted = false; let vertexIsFinished = false; let curr = scanner.lastReadGroup; for (let i = 0; i < n; i++) { const vertex = {}; while (!scanner.isEOF()) { if (curr.code === 0 || vertexIsFinished) break; switch (curr.code) { case 10: // X if (vertexIsStarted) { vertexIsFinished = true; continue; } vertex.x = curr.value; vertexIsStarted = true; break; case 20: // Y vertex.y = curr.value; break; case 30: // Z vertex.z = curr.value; break; case 40: // start width vertex.startWidth = curr.value; break; case 41: // end width vertex.endWidth = curr.value; break; case 42: // bulge if (curr.value != 0) vertex.bulge = curr.value; break; default: // if we do not hit known code return vertices. Code might belong to entity scanner.rewind(); if (vertexIsStarted) { vertices.push(vertex); } scanner.rewind(); return vertices; } curr = scanner.next(); } // See https://groups.google.com/forum/#!topic/comp.cad.autocad/9gn8s5O_w6E vertices.push(vertex); vertexIsStarted = false; vertexIsFinished = false; } scanner.rewind(); return vertices; }