nj/app/lib/features/editor/widgets/dot_grid_painter.dart

// 点阵背景画笔 — 24x24px 间距，1px 圆点
// 用于日记编辑区域提供纸质感背景

import 'package:flutter/material.dart';

/// 点阵背景画笔 -- 24x24px 间距，1px 圆点
class DotGridPainter extends CustomPainter {
  const DotGridPainter();

  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = const Color(0xFF2D2420).withOpacity(0.15)
      ..style = PaintingStyle.fill;

    const spacing = 24.0;
    const dotRadius = 1.0;

    for (double x = spacing; x < size.width; x += spacing) {
      for (double y = spacing; y < size.height; y += spacing) {
        canvas.drawCircle(Offset(x, y), dotRadius, paint);
      }
    }
  }

  @override
  bool shouldRepaint(covariant DotGridPainter oldDelegate) => false;
}