doneBeforePainterInit method
Implementation
@override
void doneBeforePainterInit() {
  super.doneBeforePainterInit();
  webColor ??= const Color.fromARGB(255, 122, 122, 122);
  webColorInner ??= const Color.fromARGB(255, 122, 122, 122);
  yAxis = initYAxis();
  if (yAxisSettingFunction != null) {
    yAxisSettingFunction!(yAxis!, this);
  }
}