feat(All):Initial

2025-10-04 23:36:07 +08:00
commit 2b4e5d2668
1321 changed files with 415958 additions and 0 deletions
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+import DxfArrayScanner, { IGroup } from '../DxfArrayScanner';
+import * as helpers from '../ParseHelpers'
+import IGeometry, { IEntity, IPoint } from './geomtry';
+
+export interface IVertex extends IPoint{
+	startWidth: number;
+	endWidth: number;
+	bulge: number;
+}
+
+export interface ILwpolylineEntity extends IEntity {
+	vertices: IVertex[];
+	elevation: number;
+	depth: number;
+	shape: boolean;
+	hasContinuousLinetypePattern: boolean;
+	width: number;
+	extrusionDirectionX: number;
+	extrusionDirectionY: number;
+	extrusionDirectionZ: number;
+}
+
+export default class Lwpolyline implements IGeometry {
+	public ForEntityName = 'LWPOLYLINE' as const;
+	public parseEntity(scanner: DxfArrayScanner, curr: IGroup) {
+		const entity = { type: curr.value, vertices: [] as IVertex[] } as ILwpolylineEntity;
+		let numberOfVertices = 0;
+		curr = scanner.next();
+		while (!scanner.isEOF()) {
+			if (curr.code === 0) break;
+
+			switch (curr.code) {
+				case 38:
+					entity.elevation = curr.value as number;
+					break;
+				case 39:
+					entity.depth = curr.value as number;
+					break;
+				case 70: // 1 = Closed shape, 128 = plinegen?, 0 = default
+					entity.shape = (((curr.value as number) & 1) === 1);
+					entity.hasContinuousLinetypePattern = (((curr.value as number) & 128) === 128);
+					break;
+				case 90:
+					numberOfVertices = curr.value as number;
+					break;
+				case 10: // X coordinate of point
+					entity.vertices = parseLWPolylineVertices(numberOfVertices, scanner);
+					break;
+				case 43:
+					if (curr.value !== 0) entity.width = curr.value as number;
+					break;
+				case 210:
+					entity.extrusionDirectionX = curr.value as number;
+					break;
+				case 220:
+					entity.extrusionDirectionY = curr.value as number;
+					break;
+				case 230:
+					entity.extrusionDirectionZ = curr.value as number;
+					break;
+				default:
+					helpers.checkCommonEntityProperties(entity, curr, scanner);
+					break;
+			}
+			curr = scanner.next();
+		}
+		return entity;
+	}
+}
+
+function parseLWPolylineVertices(n:number, scanner: DxfArrayScanner) {
+	if (!n || n <= 0) throw Error('n must be greater than 0 verticies');
+	const vertices = [] as IVertex[];
+	let vertexIsStarted = false;
+	let vertexIsFinished = false;
+	let curr = scanner.lastReadGroup as IGroup;
+
+	for (let i = 0; i < n; i++) {
+		const vertex = {} as IVertex;
+		while (!scanner.isEOF()) {
+			if (curr.code === 0 || vertexIsFinished) break;
+
+			switch (curr.code) {
+				case 10: // X
+					if (vertexIsStarted) {
+						vertexIsFinished = true;
+						continue;
+					}
+					vertex.x = curr.value as number;
+					vertexIsStarted = true;
+					break;
+				case 20: // Y
+					vertex.y = curr.value as number;
+					break;
+				case 30: // Z
+					vertex.z = curr.value as number;
+					break;
+				case 40: // start width
+					vertex.startWidth = curr.value as number;
+					break;
+				case 41: // end width
+					vertex.endWidth = curr.value as number;
+					break;
+				case 42: // bulge
+					if (curr.value != 0) vertex.bulge = curr.value as number;
+					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;
+}