getOverlayAlpha.js 533 Bytes

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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = getOverlayAlpha;
// Inspired by https://github.com/material-components/material-components-ios/blob/bca36107405594d5b7b16265a5b0ed698f85a5ee/components/Elevation/src/UIColor%2BMaterialElevation.m#L61
function getOverlayAlpha(elevation) {
  let alphaValue;
  if (elevation < 1) {
    alphaValue = 5.11916 * elevation ** 2;
  } else {
    alphaValue = 4.5 * Math.log(elevation + 1) + 2;
  }
  return Math.round(alphaValue * 10) / 1000;
}