dxf-parser
Version:
Parse dxf files into a readable, logical js object.
80 lines (79 loc) • 2.81 kB
JavaScript
import * as helpers from '../ParseHelpers';
export default class ThreeDface {
constructor() {
this.ForEntityName = '3DFACE';
}
parseEntity(scanner, curr) {
const entity = { type: curr.value, vertices: [] };
curr = scanner.next();
while (!scanner.isEOF()) {
if (curr.code === 0)
break;
switch (curr.code) {
case 70: // 1 = Closed shape, 128 = plinegen?, 0 = default
entity.shape = ((curr.value & 1) === 1);
entity.hasContinuousLinetypePattern = ((curr.value & 128) === 128);
break;
case 10: // X coordinate of point
entity.vertices = parse3dFaceVertices(scanner, curr);
curr = scanner.lastReadGroup;
break;
default:
helpers.checkCommonEntityProperties(entity, curr, scanner);
break;
}
curr = scanner.next();
}
return entity;
}
}
function parse3dFaceVertices(scanner, curr) {
var vertices = [];
var vertexIsStarted = false;
var vertexIsFinished = false;
var verticesPer3dFace = 4; // there can be up to four vertices per face, although 3 is most used for TIN
for (let i = 0; i <= verticesPer3dFace; i++) {
var vertex = {};
while (!scanner.isEOF()) {
if (curr.code === 0 || vertexIsFinished)
break;
switch (curr.code) {
case 10: // X0
case 11: // X1
case 12: // X2
case 13: // X3
if (vertexIsStarted) {
vertexIsFinished = true;
continue;
}
vertex.x = curr.value;
vertexIsStarted = true;
break;
case 20: // Y
case 21:
case 22:
case 23:
vertex.y = curr.value;
break;
case 30: // Z
case 31:
case 32:
case 33:
vertex.z = curr.value;
break;
default:
// it is possible to have entity codes after the vertices.
// So if code is not accounted for return to entity parser where it might be accounted for
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;
}
;