89 lines
2.4 KiB
TypeScript
89 lines
2.4 KiB
TypeScript
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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 I3DfaceEntity extends IEntity {
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shape: boolean;
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hasContinuousLinetypePattern: boolean;
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vertices: IPoint[];
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}
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export default class ThreeDface implements IGeometry {
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public ForEntityName = '3DFACE' as const;
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public parseEntity(scanner: DxfArrayScanner, curr: IGroup) {
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const entity = { type: curr.value as string, vertices: [] as IPoint[] } as I3DfaceEntity;
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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 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 10: // X coordinate of point
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entity.vertices = parse3dFaceVertices(scanner, curr);
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curr = scanner.lastReadGroup as IGroup;
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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 parse3dFaceVertices(scanner:DxfArrayScanner, curr:IGroup) {
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var vertices:IPoint[] = [];
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var vertexIsStarted = false;
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var vertexIsFinished = false;
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var verticesPer3dFace = 4; // there can be up to four vertices per face, although 3 is most used for TIN
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for (let i = 0; i <= verticesPer3dFace; i++) {
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var vertex = {} as IPoint;
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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: // X0
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case 11: // X1
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case 12: // X2
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case 13: // X3
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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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case 21:
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case 22:
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case 23:
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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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case 31:
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case 32:
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case 33:
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vertex.z = curr.value as number;
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break;
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default:
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// it is possible to have entity codes after the vertices.
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// So if code is not accounted for return to entity parser where it might be accounted for
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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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