code: private void setScaleStrokeWidth(byte zoomLevel) {
          int zoomLevelDiff = Math.max(zoomLevel - STROKE_MIN_ZOOM_LEVEL, 0);
          this.renderTheme.scaleStrokeWidth((float) Math.pow(STROKE_INCREASE, zoomLevelDiff), this.rendererJob.tile.zoomLevel);
      }
docs: Sets the scale stroke factor for the given zoom level.
  
  @param zoomLevel the zoom level for which the scale stroke factor should be set.