dxf-writer/src/Polyline3d.js

Dead simple 2D DXF writer

const DatabaseObject = require("./DatabaseObject");
const Handle = require("./Handle");
const Vertex = require("./Vertex");

class Polyline3d extends DatabaseObject {
    /**
     * @param {[number, number, number][]} points - Array of points like [ [x1, y1, z1], [x2, y2, z2]... ]
     */
    constructor(points) {
        super(["AcDbEntity", "AcDb3dPolyline"]);
        this.verticies = points.map((point) => {
            const [x, y, z] = point;
            const vertex = new Vertex(x, y, z);
            vertex.ownerObjectHandle = this.handle;
            return vertex;
        });
        this.seqendHandle = Handle.next();
    }

    tags(manager) {
        manager.push(0, "POLYLINE");
        super.tags(manager);
        manager.push(8, this.layer.name);
        manager.push(66, 1);
        manager.push(70, 0);
        manager.point(0, 0);

        this.verticies.forEach((vertex) => {
            vertex.layer = this.layer;
            vertex.tags(manager);
        });

        manager.push(0, "SEQEND");
        manager.push(5, this.seqendHandle);
        manager.push(100, "AcDbEntity");
        manager.push(8, this.layer.name);
    }
}

module.exports = Polyline3d;