onPaint method

@override void onPaint(Canvas canvas)

Draws trackball

• canvas - Canvas used to draw the Track line on the chart.

Implementation

@override
void onPaint(Canvas canvas) {
  if (_trackballPainter != null && !_trackballPainter!.canResetPath) {
    _trackballPainter!._drawTrackball(canvas);
  }
}