onPaint method
Implementation
@override
void onPaint(Canvas canvas, Size size) {
super.onPaint(canvas, size);
renderer!.drawData(canvas);
if (valuesToHighlight()) {
renderer!.drawHighlighted(canvas, indicesToHighlight);
}
renderer!.drawExtras(canvas);
renderer!.drawValues(canvas);
legendRenderer!.renderLegend(canvas);
drawDescription(canvas, size);
drawMarkers(canvas);
}