MapGIS Client for JavaScript API

import { defaultValue } from './Utils'
import GeometryType from '../base/enum/GeometryType'
import {
  Circle,
  Extent,
  LineString,
  Log,
  MultiPolygon,
  Point,
  Polygon
} from '../index'

/**
 * @function createGeometry
 * @private
 * @param options 生成参数
 * @description 根据参数生成几何
 * @return Geometry 生成的几何对象
 */
function createGeometry(options) {
  options = defaultValue(options, {})

  switch (options.type) {
    case GeometryType.circle:
      return new Circle(options)
    case GeometryType.extent:
      return new Extent(options)
    case GeometryType.lineString:
      return new LineString(options)
    case GeometryType.multiPolygon:
      return new MultiPolygon(options)
    case GeometryType.point:
      return new Point(options)
    case GeometryType.polygon:
      return new Polygon(options)
    default:
      return new Polygon(options)
  }
}

/**
 * @description: 获取几何中心
 * @param {*} geometry
 * @return {Point}
 */
function getGeometryCenter(geometry) {
  if (!geometry) {
    Log.error('几何为空')
  }
  let point
  switch (geometry.type) {
    case GeometryType.point: {
      point = geometry
      break
    }
    case GeometryType.multiPoint:
    case GeometryType.lineString:
    case GeometryType.multiLineString:
    case GeometryType.multiPolygon: {
      point = geometry.extent.center
      break
    }
    case GeometryType.polygon: {
      point = geometry.centroid
      break
    }
    case GeometryType.extent: {
      point = geometry.center
      break
    }
    case GeometryType.circle: {
      point = geometry.center
      break
    }
    default: {
      point = geometry.extent.center
    }
  }
  return point
}

export { createGeometry, getGeometryCenter }