What is GraphicsView and when do you use it?

GraphicsView is a canvas for 2D drawing via an IDrawable. You implement Draw(ICanvas canvas, RectF dirtyRect) to render shapes, paths, text, and images with platform-consistent output. Use it for charts, signatures, gauges, or any custom visuals not expressible with standard controls.

public class RingDrawable : IDrawable
{
    public void Draw(ICanvas canvas, RectF rect)
    {
        canvas.StrokeColor = Colors.Purple;
        canvas.StrokeSize = 8;
        canvas.DrawCircle(rect.Center, 40);
    }
}