public String graphicalToString(CellMatrix<E> matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
StringBuilder graphic = new StringBuilder();
appendFirstRow(graphic, width);
for (int y = 0; y < height - 1; y++) {
appendContentRow(graphic, y, width, matrix);
appendDelimiterRow(graphic, width);
}
appendContentRow(graphic, height - 1, width, matrix);
appendLastRow(graphic, width);
return graphic.toString();
}
private String appendCellContent(CellMatrix<E> matrix, int x, int y) {
E cell = matrix.getCell(x, y);
return cell != null ? getFormatter(cell).format(cell) : " " + style.getUndefined() + " ";
}