sub.js

import { checkRange } from './utilMatrix.js';

import BaseView from './base.js';

export default class MatrixSubView extends BaseView {
  constructor(matrix, startRow, endRow, startColumn, endColumn) {
    checkRange(matrix, startRow, endRow, startColumn, endColumn);
    super(matrix, endRow - startRow + 1, endColumn - startColumn + 1);
    this.startRow = startRow;
    this.startColumn = startColumn;
  }

  set(rowIndex, columnIndex, value) {
    this.matrix.set(
      this.startRow + rowIndex,
      this.startColumn + columnIndex,
      value,
    );
    return this;
  }

  get(rowIndex, columnIndex) {
    return this.matrix.get(
      this.startRow + rowIndex,
      this.startColumn + columnIndex,
    );
  }
}