void paint()

in packages/diagrams/lib/src/text.dart [382:486]
89 lines of code
2 McCabe index (conditional complexity)

  void paint(Canvas canvas, Size size) {
    final Paint paint = Paint();
    if (index.isEven) {
      paint.color = const Color.fromARGB(255, 235, 235, 235);
    } else {
      paint.color = const Color.fromARGB(255, 250, 250, 250);
    }
    canvas.drawRect(Rect.fromLTRB(0, 0, size.width, size.height), paint);

    final TextPainter textPainter = TextPainter(
      text: TextSpan(
        text: 'height:$height, $text',
        style: TextStyle(
          fontSize: 50,
          height: height,
          color: Colors.black,
        ),
      ),
      textAlign: TextAlign.left,
      textDirection: TextDirection.ltr,
    );
    textPainter.layout();

    final List<TextBox> boxes = textPainter.getBoxesForSelection(
        const TextSelection(baseOffset: 0, extentOffset: largeIndex));

    paint.color = Colors.black;
    paint.strokeWidth = 3.5;
    const double top = 0;
    final double bottom = textPainter.height;
    final double baseline =
        textPainter.computeDistanceToActualBaseline(TextBaseline.alphabetic);

    final double width = boxes[boxes.length - 1].right;
    final Offset baseOffset = Offset(
        (size.width - width) / 2 + 30, (size.height - textPainter.height) / 2);

    textPainter.paint(canvas, baseOffset);

    paint.color = Colors.red[900]!;
    // Top
    canvas.drawLine(
      baseOffset,
      baseOffset + Offset(width, top),
      paint,
    );

    // Bottom
    canvas.drawLine(
      baseOffset + Offset(0, bottom),
      baseOffset + Offset(width, bottom),
      paint,
    );

    // Baseline
    paint.color = Colors.black;
    paint.strokeWidth = 2.5;
    canvas.drawLine(
      baseOffset + Offset(0, baseline),
      baseOffset + Offset(width, baseline),
      paint,
    );

    paint.strokeWidth = 2;
    paint.style = PaintingStyle.stroke;

    paint.color = Colors.blue[900]!;
    final Path path = Path();
    path.moveTo(baseOffset.dx - 10, baseOffset.dy + top);
    path.lineTo(baseOffset.dx - 25, baseOffset.dy + top);
    path.lineTo(baseOffset.dx - 25, baseOffset.dy + bottom);
    path.lineTo(baseOffset.dx - 10, baseOffset.dy + bottom);
    canvas.drawPath(path, paint);

    TextPainter label = TextPainter(
      text: TextSpan(
        text: '${bottom - top}px',
        style: const TextStyle(
          fontSize: 20,
          color: Colors.black,
        ),
      ),
      textAlign: TextAlign.right,
      textDirection: TextDirection.ltr,
    );
    label.layout();
    label.paint(
        canvas, baseOffset + Offset(-25.0 - 80, (top + bottom) / 2 - 10));

    paint.color = Colors.black;
    // Baseline label
    label = TextPainter(
      text: const TextSpan(
        text: 'Alphabetic Baseline',
        style: TextStyle(
          fontSize: 9,
          color: Colors.black,
        ),
      ),
      textAlign: TextAlign.left,
      textDirection: TextDirection.ltr,
    );
    label.layout();
    label.paint(canvas, baseOffset + Offset(0, baseline + 1));
  }