@Override
    public void paintComponent(Graphics g) {
      super.paintComponent(g);

      Graphics2D g2d = (Graphics2D) g;

      g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
      g2d.setRenderingHint(
          RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
      g2d.setRenderingHint(
          RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

      for (Slot slot : Slot.values()) {
        if (slot.isShow() || slot == useSlot) {
          paintSequence(slot, slot.getPoints(), Color.BLACK, g2d);
        }
      }
    }
    /**
     * @param points
     * @param color
     * @param g
     */
    private void paintSequence(
        Slot type, List<List<ValuePointColored>> points, Color color, Graphics2D g) {
      int i = 0;
      int size = points.size();

      if (size > 0) {
        double increment = 200 / size;

        for (List<ValuePointColored> valuePoints : points) {
          int alpha = (int) (i * increment) + 55;
          Color c = new Color(color.getRed(), color.getGreen(), color.getBlue(), alpha);
          for (ValuePointColored valuePoint : valuePoints) {
            double[] coordinates = valuePoint.getPoint().toArray();
            int x = xToPix(coordinates[0]);
            int y = yToPix(coordinates[1]);
            // if minimum then red, else black
            if (valuePoint.getBest() == true) {
              g.setColor(Color.red);
            } else {
              g.setColor(c);
            }
            g.setStroke(LINE);

            switch (type) {
              case CIRCLE:
                g.drawOval(x - RADIUS / 2 - 3, y - RADIUS / 2 - 3, RADIUS * 2, RADIUS * 2);
                break;
              case SQUARE:
                g.drawRect(x - RADIUS / 2 - 2, y - RADIUS / 2 - 2, RADIUS * 2 - 2, RADIUS * 2 - 2);
                break;
              case TRIANGLE:
                GeneralPath polyline = new GeneralPath(GeneralPath.WIND_EVEN_ODD, 3);
                polyline.moveTo(x, y - RADIUS / 2 - 4);
                polyline.lineTo(x + RADIUS / 2 + 3, y + RADIUS / 2 + 1);
                polyline.lineTo(x - RADIUS / 2 - 3, y + RADIUS / 2 + 1);
                polyline.closePath();
                g.draw(polyline);
                break;
              case CROSS:
                int xLow = x - RADIUS / 2 - 1;
                int xHigh = x + RADIUS / 2 + 1;
                int yLow = y - RADIUS / 2 - 1;
                int yHigh = y + RADIUS / 2 + 1;
                g.drawLine(xLow, yLow, xHigh, yHigh);
                g.drawLine(xHigh, yLow, xLow, yHigh);
                break;
            }
          }
          i++;
        }
      }
    }