public override void Draw(Android.Graphics.Canvas canvas)
        {
            base.Draw(canvas);

            var rect = new RectF(0,0,300,300);
            switch (TheShape)
            {
                case Shape.Circle:
                    canvas.DrawOval(rect, new Paint() { Color = Color.Aqua });
                    break;
                case Shape.Square:
                    canvas.DrawRect(rect, new Paint() { Color = Color.Red });
                    break;
                case Shape.Triangle:
                    var path = new Path();
                    path.MoveTo(rect.CenterX(), 0);
                    path.LineTo(0, rect.Height());
                    path.LineTo(rect.Width(), rect.Height());
                    path.Close();

                    var paint = new Paint() {Color = Color.Magenta};
                    paint.SetStyle(Paint.Style.Fill);
                    canvas.DrawPath(path, paint);
                    break;

                default:
                    throw new ArgumentOutOfRangeException();
            }
        }
        protected override void OnDraw(Android.Graphics.Canvas canvas)
        {
            var rect = new RectF(0, 0, 300, 300);
            switch (Shape)
            {
                case Shape.Circle:
                    canvas.DrawOval(rect, new Paint() { Color = Color.CornflowerBlue });
                    break;
                case Shape.Square:
                    canvas.DrawRect(rect, new Paint() { Color = Color.Crimson });
                    break;
                case Shape.Triangle:

                    var path = new Path();
                    path.MoveTo(rect.CenterX(), rect.Top);
                    path.LineTo(rect.Left, rect.Bottom);
                    path.LineTo(rect.Right, rect.Bottom);
                    path.Close();
                    var paint = new Paint() {Color = Color.Crimson};
                    paint.Color = Color.Gold;
                    paint.SetStyle(Paint.Style.Fill);
                    canvas.DrawPath(path, paint);
                    break;
                default:
                    throw new ArgumentOutOfRangeException();
            }
        }
 public override void Draw(Android.Graphics.Canvas canvas)
 {
     canvas.DrawOval(mRectF, mPaint);
 }