, centerPt } = this._params;
                for (let i = 0; i < len; i++) {
                    const result = chunkLines.slice(i, i + trail);
                    const ps = getChunkLinesPosition(result, layer, positionMap, centerPt).positions;
                    this._params.positions[i] = ps;
                }
            }


            _animation() {
                const { index, positions, idx, speed, len, chunkLines, layer, trail, positionMap, centerPt } = this._params;
                const i = Ma