= {
                    trail: Math.max(1, trail),
                    index: 0,
                    len: chunkLines.length,
                    chunkLines,
                    layer,
                    speed: Math.min(1, speed),
                    idx: 0,
                    positions: [],
                    positionMap,
                    centerPt
                };
                // this._init();
            }


            _init() {
                const { len, chunkLines, layer, trail, positionMap