int (Painter painter, int x, int y) { int index = painter.findIndex(x, y); if (null != painter.getErrorStripe(index)) return index; index = painter.findIndex(x, y + 1); if (null != painter.getErrorStripe(index)) return index; index = painter.findIndex(x, y - 1); if (null != painter.getErrorStripe(index)) return index; index = painter.findIndex(x, y + 2); if (null != painter.getErrorStripe(index)) return index; return -1; }