MapGIS Client for JavaScript API

import { Zondy } from '../../../base'
import { defaultValue } from '../../../util'
import LOD from './LOD'

/**
 * 瓦片切图信息
 * @class TileInfo
 * @param {Number} [options.dpi = -1] 屏幕分辨率
 * @param {Number} [options.format = 'png'] 瓦片图像格式
 * @param {Point} [options.origin] 裁图原点
 * @param {Array<LOD>} [options.lods = []] 多层次细节数组
 * @param {Array<Number>} [options.size] 瓦片大小，单位像素
 * @param {SpatialReference} [options.spatialReference] 空间参考系
 */
class TileInfo {
  constructor(options) {
    options = options || {}

    this.dpi = defaultValue(options.dpi, -1)
    this.format = defaultValue(options.format, 'png')
    this.origin = options.origin
    const _lods = []
    const _optLods = defaultValue(options.lods, [])
    for (let i = 0; i < _optLods.length; i++) {
      _lods.push(LOD.fromJSON(_optLods[i]))
    }
    this.lods = _lods
    this.size = options.size
    this.spatialReference = options.spatialReference
  }

  /**
   * @description: 根据json构造实例
   * @param {Object} options json对象
   * @return {TileInfo}
   */
  static fromJSON(options) {
    return new TileInfo(options)
  }

  /**
   * @description: 导出为json对象
   * @return {Object}
   */
  toJSON() {
    return {
      dpi: this.dpi,
      format: this.format,
      origin: this.origin ? this.origin.toJSON() : undefined,
      lods: this.lods.map((lod) => lod.toJSON()),
      size: this.size ? [this.size[0], this.size[1]] : undefined,
      spatialReference: this.spatialReference && this.spatialReference.toJSON()
    }
  }

  /**
   * @description: 根据比例尺分母计算对应的级别
   * @private
   * @param {Number} scale
   * @return {Number}
   */
  scaleToZoom(scale) {
    return 0
  }

  /**
   * @description: 根据级别计算对应的比例尺分母
   * @private
   * @param {Number} zoom
   * @return {Number}
   */
  zoomToScale(zoom) {
    return 0
  }
}

Zondy.TileInfo = TileInfo
export default TileInfo