drawBlueText method Null safety
override
Implementation
@override
void drawBlueText(Canvas canvas, double w) {
super.drawBlueText(canvas, w);
// Extend the line on the top of the square root symbol
TextSpan span = TextSpan(style: bFactory.gTextStyle, text: '\u203E');
TextPainter tp = TextPainter(
text: span,
textAlign: TextAlign.center,
textDirection: TextDirection.ltr);
tp.layout(minWidth: w);
tp.paint(canvas, gTextOffset.translate(5.4, -2.2));
tp.paint(canvas, gTextOffset.translate(13, -2.2));
}