private void rebuild() {
   // update indeterminate indicator
   final int segments = skin.indeterminateSegmentCount.get();
   opacities.clear();
   pathsG.getChildren().clear();
   final double step = 0.8 / (segments - 1);
   for (int i = 0; i < segments; i++) {
     Region region = new Region();
     region.setScaleShape(false);
     region.setCenterShape(false);
     region.getStyleClass().addAll("segment", "segment" + i);
     if (fillOverride instanceof Color) {
       Color c = (Color) fillOverride;
       region.setStyle(
           "-fx-background-color: rgba("
               + ((int) (255 * c.getRed()))
               + ","
               + ""
               + ((int) (255 * c.getGreen()))
               + ","
               + ((int) (255 * c.getBlue()))
               + ","
               + ""
               + c.getOpacity()
               + ");");
     } else {
       region.setStyle(null);
     }
     double opacity = Math.min(1, i * step);
     opacities.add(opacity);
     region.setOpacity(opacity);
     pathsG.getChildren().add(region);
   }
 }
    @Override
    protected void layoutChildren() {
      // Position and size the circular background
      // double doneTextHeight = doneText.getLayoutBounds().getHeight();
      final Insets controlInsets = control.getInsets();
      final double left = snapSize(controlInsets.getLeft());
      final double right = snapSize(controlInsets.getRight());
      final double top = snapSize(controlInsets.getTop());
      final double bottom = snapSize(controlInsets.getBottom());

      /*
       ** use the min of width, or height, keep it a circle
       */
      final double areaW = control.getWidth() - left - right;
      final double areaH = control.getHeight() - top - bottom /*- textGap - doneTextHeight*/;
      final double radiusW = areaW / 2;
      final double radiusH = areaH / 2;
      final double radius = Math.round(Math.min(radiusW, radiusH)); // use round instead of floor
      final double centerX = snapPosition(left + radiusW);
      final double centerY = snapPosition(top + radius);

      // find radius that fits inside radius - insetsPadding
      final Insets indicatorInsets = indicator.getInsets();
      final double iLeft = snapSize(indicatorInsets.getLeft());
      final double iRight = snapSize(indicatorInsets.getRight());
      final double iTop = snapSize(indicatorInsets.getTop());
      final double iBottom = snapSize(indicatorInsets.getBottom());
      final double progressRadius =
          snapSize(
              Math.min(
                  Math.min(radius - iLeft, radius - iRight),
                  Math.min(radius - iTop, radius - iBottom)));

      indicatorCircle.setRadius(radius);
      indicator.setLayoutX(centerX);
      indicator.setLayoutY(centerY);

      arcShape.setRadiusX(progressRadius);
      arcShape.setRadiusY(progressRadius);
      progress.setLayoutX(centerX);
      progress.setLayoutY(centerY);

      // find radius that fits inside progressRadius - progressInsets
      final Insets progressInsets = progress.getInsets();
      final double pLeft = snapSize(progressInsets.getLeft());
      final double pRight = snapSize(progressInsets.getRight());
      final double pTop = snapSize(progressInsets.getTop());
      final double pBottom = snapSize(progressInsets.getBottom());
      final double indicatorRadius =
          snapSize(
              Math.min(
                  Math.min(progressRadius - pLeft, progressRadius - pRight),
                  Math.min(progressRadius - pTop, progressRadius - pBottom)));

      // find size of spare box that fits inside indicator radius
      double squareBoxHalfWidth = Math.ceil(Math.sqrt((indicatorRadius * indicatorRadius) / 2));
      // double squareBoxHalfWidth2 = indicatorRadius * (Math.sqrt(2) / 2);

      tick.setLayoutX(centerX - squareBoxHalfWidth);
      tick.setLayoutY(centerY - squareBoxHalfWidth);
      tick.resize(squareBoxHalfWidth + squareBoxHalfWidth, squareBoxHalfWidth + squareBoxHalfWidth);
      tick.setVisible(control.getProgress() >= 1);
    }