protected java.awt.Point adjustDrawPointToViewport(
      int x, int y, java.awt.geom.Rectangle2D bounds, java.awt.Rectangle viewport) {
    if (x + bounds.getMaxX() > viewport.getWidth())
      x = (int) (viewport.getWidth() - bounds.getWidth()) - 1;
    else if (x < 0) x = 0;

    if (y + bounds.getMaxY() > viewport.getHeight())
      y = (int) (viewport.getHeight() - bounds.getHeight()) - 1;
    else if (y < 0) y = 0;

    return new java.awt.Point(x, y);
  }