Function scalesToResolutions

src/common/util/MapCalculateUtil.js:183–213

(scales, bounds, dpi, mapUnit, level = 22, baseScale)

  * ```
 */
 export function scalesToResolutions(scales, bounds, dpi, mapUnit, level = 22, baseScale) {
  const dpiValue = dpi === '' || dpi === null || dpi === undefined ? 96 : dpi;
  var resolutions = [];
  if (scales && scales.length > 0) {
    for (let i = 0; i < scales.length; i++) {
      resolutions.push(scaleToResolution(scales[i], dpiValue, mapUnit));
    }
  } else if (baseScale){
    const maxReolution = Math.abs(bounds.left - bounds.right) / 256;
    const baseRes = scaleToResolution(baseScale, dpiValue, mapUnit);
    let topRes = baseRes;
    for (let i = 0; i < level; i++) {
      const temp = baseRes * Math.pow(2, i);
      if(Math.abs(temp - maxReolution) <= 1E-6 || temp > maxReolution){
        topRes = temp;
        break;
      }
    }
    for (let i = 0; i < level; i++) {
      resolutions.push(topRes / Math.pow(2, i));
    }
  } else {
    const maxReolution = Math.abs(bounds.left - bounds.right) / 256;
    for (let i = 0; i < level; i++) {
      resolutions.push(maxReolution / Math.pow(2, i));
    }
  }
  return resolutions.sort(function (a, b) {
    return b - a;
  });
}
/**
  * @private
  * @function getZoomByResolution