drawGrid method

void drawGrid(Canvas canvas, Size size, double minX, double maxX, double minY, double maxY,)

Draw grid lines (optimized with batched operations)

Implementation

void drawGrid(
  Canvas canvas,
  Size size,
  double minX,
  double maxX,
  double minY,
  double maxY,
) {
  if (!showGrid || !theme.showGrid) return;

  // Create paint once
  final paint = Paint()
    ..color = theme.gridColor.withValues(alpha: 0.5)
    ..strokeWidth = 0.5
    ..style = PaintingStyle.stroke;

  // Horizontal grid lines only (more professional)
  // Pre-calculate y positions and batch draw
  const horizontalLines = 5;
  final lineSpacing = size.height / horizontalLines;
  final path = Path();

  for (int i = 1; i < horizontalLines; i++) {
    final y = lineSpacing * i;
    path.moveTo(0, y);
    path.lineTo(size.width, y);
  }

  canvas.drawPath(path, paint);
}