Class Grid

scripts/grid.cjs:44–154

};

class Grid {
  constructor(w, h) {
    this.w = w;
    this.h = h;
    this.cells = Array.from({ length: h }, () => Array(w).fill(' '));
  }

  put(x, y, char) {
    if (x >= 0 && x < this.w && y >= 0 && y < this.h) {
      this.cells[y][x] = char;
    }
  }

  text(x, y, str) {
    for (let i = 0; i < str.length; i++) {
      this.put(x + i, y, str[i]);
    }
  }

  box(x, y, w, h, label, style = 'single') {
    const s = STYLES[style] || STYLES.single;

    // Corners
    this.put(x, y, s.tl);
    this.put(x + w - 1, y, s.tr);
    this.put(x, y + h - 1, s.bl);
    this.put(x + w - 1, y + h - 1, s.br);

    // Top and bottom borders
    for (let i = 1; i < w - 1; i++) {
      this.put(x + i, y, s.h);
      this.put(x + i, y + h - 1, s.h);
    }

    // Side borders
    for (let j = 1; j < h - 1; j++) {
      this.put(x, y + j, s.v);
      this.put(x + w - 1, y + j, s.v);
    }

    // Label (centered, supports multiline)
    const lines = label.split('\n');
    const startY = y + Math.floor((h - lines.length) / 2);
    for (let li = 0; li < lines.length; li++) {
      const line = lines[li];
      const startX = x + Math.floor((w - line.length) / 2);
      this.text(startX, startY + li, line);
    }

    return { x, y, w, h };
  }

  hArrow(x1, x2, y, label, labelY) {
    const dir = x2 > x1 ? 1 : -1;
    for (let x = x1; x !== x2; x += dir) {
      this.put(x, y, '-');
    }
    this.put(x2, y, dir > 0 ? '>' : '<');