RoundedRectangleF.cs

using System.Drawing;
using System.Drawing.Drawing2D;

namespace AndroidSideloader
{
    public class RoundedRectangleF
    {
        private Point location;
        private readonly float x, y;
        private readonly float width, height;


        public RoundedRectangleF(float width, float height, float radius, float x = 0, float y = 0)
        {

            location = new Point(0, 0);
            Radius = radius;
            this.x = x;
            this.y = y;
            this.width = width;
            this.height = height;
            Path = new GraphicsPath();
            if (radius <= 0)
            {
                Path.AddRectangle(new RectangleF(x, y, width, height));
                return;
            }
            RectangleF upperLeftRect = new RectangleF(x, y, 2 * radius, 2 * radius);
            RectangleF upperRightRect = new RectangleF(width - (2 * radius) - 1, x, 2 * radius, 2 * radius);
            RectangleF lowerLeftRect = new RectangleF(x, height - (2 * radius) - 1, 2 * radius, 2 * radius);
            RectangleF lowerRightRect = new RectangleF(width - (2 * radius) - 1, height - (2 * radius) - 1, 2 * radius, 2 * radius);

            Path.AddArc(upperLeftRect, 180, 90);
            Path.AddArc(upperRightRect, 270, 90);
            Path.AddArc(lowerRightRect, 0, 90);
            Path.AddArc(lowerLeftRect, 90, 90);
            Path.CloseAllFigures();

        }
        public RoundedRectangleF()
        {
        }
        public GraphicsPath Path { get; }
        public RectangleF Rect => new RectangleF(x, y, width, height);
        public float Radius { get; set; }

    }
}