label function
Implementation
label(Canvas canvas, String text, Offset offset) {
final textSpan = TextSpan(
text: text,
style: TextStyle(color: Colors.black, fontSize: 16),
);
final textPainter =
TextPainter(text: textSpan, textDirection: TextDirection.ltr);
textPainter.layout(
minWidth: 0,
maxWidth: 100,
);
textPainter.paint(canvas, offset + Offset(0, -20));
}