docs: private static int getShadowColor(final int elevation, @NonNull final Orientation orientation,
                                        final boolean parallelLight) {
          int alpha;
  
          if (parallelLight) {
              alpha = getShadowAlpha(elevation, MIN_BOTTOM_ALPHA, MAX_BOTTOM_ALPHA);
          } else {
              switch (orientation) {
                  case LEFT:
                      alpha = getShadowAlpha(elevation, MIN_LEFT_ALPHA, MAX_LEFT_ALPHA);
                      break;
                  case TOP:
                      alpha = getShadowAlpha(elevation, MIN_TOP_ALPHA, MAX_TOP_ALPHA);
                      break;
                  case RIGHT:
                      alpha = getShadowAlpha(elevation, MIN_RIGHT_ALPHA, MAX_RIGHT_ALPHA);
                      break;
                  case BOTTOM:
                      alpha = getShadowAlpha(elevation, MIN_BOTTOM_ALPHA, MAX_BOTTOM_ALPHA);
                      break;
                  default:
                      throw new IllegalArgumentException("Invalid orientation: " + orientation);
              }
          }
  
          return Color.argb(alpha, 0, 0, 0);
      }