public void paintComponent(Graphics g) {
    super.paintComponent(g);
    ((Graphics2D) g)
        .setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    Dimension theSize = getSize();

    if (mColorListMode == VisualizationColor.cColorListModeCategories) {
      int categories = mCategoryColorList.length;
      if (categories <= cMaxEditableColors) {
        int fieldWidth = (theSize.width - 2 * cBorder + cSpacing) / categories - cSpacing;
        mRect = new Rectangle[categories];
        for (int i = 0; i < categories; i++) {
          mRect[i] =
              new Rectangle(
                  cBorder + i * (fieldWidth + cSpacing),
                  cBorder,
                  fieldWidth,
                  theSize.height - 2 * cBorder);
          drawColorButton(g, i);
        }
      } else {
        final String message = "<too many colors to edit>";
        g.setColor(Color.GRAY);
        g.setFont(new Font("Arial", Font.BOLD, 13));
        FontMetrics m = g.getFontMetrics();
        g.drawString(
            message,
            (theSize.width - m.stringWidth(message)) / 2,
            (theSize.height + m.getHeight()) / 2 - m.getDescent());
      }
    } else {
      int size = theSize.height - 2 * cBorder;
      int x1 = 2 * cBorder + size;
      int x2 = theSize.width - 2 * cBorder - size;
      mRect = new Rectangle[3];
      mRect[0] = new Rectangle(cBorder, cBorder, size, size);
      mRect[1] =
          new Rectangle(
              theSize.width - size - cBorder, theSize.height - size - cBorder, size, size);
      mRect[cColorWedgeButton] = new Rectangle(x1, cBorder, x2 - x1, size);
      drawColorButton(g, 0);
      drawColorButton(g, 1);
      drawColorButton(g, cColorWedgeButton);
    }
  }
  private void drawColorButton(Graphics g, int no) {
    g.setColor(cDarkShadowColor);
    g.drawLine(mRect[no].x, mRect[no].y, mRect[no].x + mRect[no].width - 2, mRect[no].y);
    g.drawLine(mRect[no].x, mRect[no].y, mRect[no].x, mRect[no].y + mRect[no].height - 2);
    g.drawLine(
        mRect[no].x + mRect[no].width - 2,
        mRect[no].y + 2,
        mRect[no].x + mRect[no].width - 2,
        mRect[no].y + mRect[no].height - 2);
    g.drawLine(
        mRect[no].x + 2,
        mRect[no].y + mRect[no].height - 2,
        mRect[no].x + mRect[no].width - 2,
        mRect[no].y + mRect[no].height - 2);

    if (mPressedButton != no || !mMouseOverButton) g.setColor(Color.white);

    g.drawLine(
        mRect[no].x + 1, mRect[no].y + 1, mRect[no].x + mRect[no].width - 3, mRect[no].y + 1);
    g.drawLine(
        mRect[no].x + 1, mRect[no].y + 1, mRect[no].x + 1, mRect[no].y + mRect[no].height - 3);

    if (mPressedButton == no && mMouseOverButton) g.setColor(Color.white);

    g.drawLine(
        mRect[no].x + mRect[no].width - 1,
        mRect[no].y + 1,
        mRect[no].x + mRect[no].width - 1,
        mRect[no].y + mRect[no].height - 1);
    g.drawLine(
        mRect[no].x + 1,
        mRect[no].y + mRect[no].height - 1,
        mRect[no].x + mRect[no].width - 1,
        mRect[no].y + mRect[no].height - 1);

    if (mColorListMode != VisualizationColor.cColorListModeCategories && no == cColorWedgeButton) {
      int x1 = mRect[no].x + 2;
      int x2 = x1 + mRect[no].width - 4;
      if (x1 < x2) {
        for (int x = x1; x < x2; x++) {
          int c = mWedgeColorList.length * (x - x1) / (x2 - x1);
          g.setColor(
              (mPressedButton == no && mMouseOverButton)
                  ? mWedgeColorList[c].darker()
                  : mWedgeColorList[c]);
          g.drawLine(x, mRect[no].y + 2, x, mRect[no].y + mRect[no].height - 3);
        }
      }
    } else {
      Color color =
          (mColorListMode == VisualizationColor.cColorListModeCategories)
              ? mCategoryColorList[no]
              : mWedgeColorList[no * (mWedgeColorList.length - 1)];
      if (mPressedButton == no && mMouseOverButton) color = color.darker();

      g.setColor(color);
      g.fillRect(mRect[no].x + 2, mRect[no].y + 2, mRect[no].width - 4, mRect[no].height - 4);
    }
  }