Method getStyleResolutions

src/openlayers/mapping/WebMap.js:5192–5205

* @private * @function WebMap.prototype.getStyleResolutions * @description 创建图层分辨率。 * @param {Object} bounds 图层上下左右范围。 * @returns {Array} styleResolutions 样式分辨率。

(bounds, minZoom = 0, maxZoom = 22)

   * @returns {Array} styleResolutions 样式分辨率。
   */
  getStyleResolutions(bounds, minZoom = 0, maxZoom = 22) {
    let styleResolutions = [];
    const TILE_SIZE = 512;
    let temp = Math.abs(bounds.left - bounds.right) / TILE_SIZE;
    for (let i = minZoom; i <= maxZoom; i++) {
      if (i === 0) {
        styleResolutions[i] = temp;
        continue;
      }
      temp = temp / 2;
      styleResolutions[i] = temp;
    }
    return styleResolutions;
  }

  /**
   * @private