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