private static void DrawPoint(IViewPort viewPort, int x, int y)
{
var pointRect = new CGRect(viewPort.DisplayPosition(new CGPoint(x, y)), new CGSize(CircleSize, CircleSize));
var path = UIBezierPath.FromOval(pointRect);
path.Fill();
}
protected virtual CGPoint GetDrawPosition(double sourceX, double sourceY, IViewPort viewPort, IXAxis xAxis, IYAxis yAxis) => viewPort.DisplayPosition(new CGPoint(xAxis.GetContentValue(sourceX), yAxis.GetContentValue(sourceY)));