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// 根据 connectNulls 值处理 points\n  let path = [];\n  for (let i = 0, len = points.length; i < len; i++) {\n    const eachLinePoints = points[i];\n    path = path.concat(getPath(eachLinePoints, isInCircle, isStack, smooth, constraint, shapeAttrs));\n  }\n  shapeAttrs.path = path;\n\n  return shapeAttrs;\n}\n\n// 单条 path\nfunction getSinglePath(\n  points: Point[],\n  isInCircle: boolean,\n  smooth?: boolean,\n  constraint?: Position[],\n  style?: ShapeAttrs\n) {\n  if (points.length === 1) {\n    // 只有一个点时\n    return [\n      ['M', points[0].x, points[0].y - style.lineWidth / 2],\n      ['L', points[0].x, points[0].y],\n      ['L', points[0].x, points[0].y + style.lineWidth / 2],\n    ];\n  }\n\n  let path;\n  if (!smooth) {\n    path = getLinePath(points, false);\n    if (isInCircle) {\n      path.push(['Z']);\n    }\n  } else {\n    // 直角坐标系下绘制曲线时限制最大值、最小值\n    if (isInCircle && points.length) {\n      points.push({ x: points[0].x, y: points[0].y });\n    }\n    path = getSplinePath(points, false, constraint);\n  }\n\n  return path;\n}\n\nfunction getRangePath(\n  points: RangePoint[],\n  isInCircle: boolean,\n  isStack?: boolean,\n  smooth?: boolean,\n  constraint?: Position[],\n  style?: ShapeAttrs\n) {\n  const topPoints = [];\n  const bottomPoints = [];\n  each(points, (point: RangePoint) => {\n    const result = splitPoints(point);\n    topPoints.push(result[1]); // 上边\n    bottomPoints.push(result[0]); // 底边\n  });\n\n  const topPath = getSinglePath(topPoints, isInCircle, smooth, constraint, style);\n  const bottomPath = getSinglePath(bottomPoints, isInCircle, smooth, constraint, style);\n  if (isStack) {\n    return topPath;\n  }\n  return topPath.concat(bottomPath);\n}\n\n/**\n * 获取折线图 path\n */\nexport function getPath(\n  points: Point[] | RangePoint[],\n  isInCircle: boolean,\n  isStack?: boolean,\n  smooth?: boolean,\n  constraint?: Position[],\n  style?: ShapeAttrs\n) {\n  if (points.length) {\n    const first = points[0];\n\n    return isArray(first.y)\n      ? getRangePath(points as RangePoint[], isInCircle, isStack, smooth, constraint, style)\n      : getSinglePath(points as Point[], isInCircle, smooth, constraint, style);\n  }\n  return [];\n}\n\nconst LineShapeFactory = registerShapeFactory('line', {\n  defaultShapeType: 'line',\n});\n\n// 这里因为代码公用，所以直接全部注册\n// 'line' 默认折线；'dot' 点线 ···；'dash' 断线 - - -\neach(['line', 'dot', 'dash', 'smooth'], (shapeType) => {\n  registerShape('line', shapeType, {\n    draw(cfg: ShapeInfo, container: IGroup) {\n      const smooth = shapeType === 'smooth';\n      let constraint;\n      if (smooth) {\n        const { start, end } = this.coordinate;\n        constraint = [\n          [start.x, end.y],\n          [end.x, start.y],\n        ];\n      }\n\n      const attrs = getShapeAttrs(cfg, smooth, constraint);\n      const shape = container.addShape({\n        type: 'path',\n        attrs,\n        name: 'line',\n        capture: !smooth,\n      });\n\n      return shape;\n    },\n    getMarker(markerCfg: ShapeMarkerCfg) {\n      return getLineMarker(markerCfg, shapeType);\n    },\n  });\n});\n\nexport default LineShapeFactory;\n"]}