graphic extension

GraphicExtension.cs

 public static class GraphicsExtension
    {
        private static GraphicsPath GenerateRoundedRectangle(
            this Graphics graphics,
            RectangleF rectangle,
            float radius)
        {
            float diameter;
            GraphicsPath path = new GraphicsPath();
            if (radius <= 0.0F)
            {
                path.AddRectangle(rectangle);
                path.CloseFigure();
                return path;
            }
            else
            {
                if (radius >= (Math.Min(rectangle.Width, rectangle.Height)) / 2.0)
                    return graphics.GenerateCapsule(rectangle);
                diameter = radius * 2.0F;
                SizeF sizeF = new SizeF(diameter, diameter);
                RectangleF arc = new RectangleF(rectangle.Location, sizeF);
                path.AddArc(arc, 180, 90);
                arc.X = rectangle.Right - diameter;
                path.AddArc(arc, 270, 90);
                arc.Y = rectangle.Bottom - diameter;
                path.AddArc(arc, 0, 90);
                arc.X = rectangle.Left;
                path.AddArc(arc, 90, 90);
                path.CloseFigure();
            }
            return path;
        }
        private static GraphicsPath GenerateCapsule(
            this Graphics graphics,
            RectangleF baseRect)
        {
            float diameter;
            RectangleF arc;
            GraphicsPath path = new GraphicsPath();
            try
            {
                if (baseRect.Width > baseRect.Height)
                {
                    diameter = baseRect.Height;
                    SizeF sizeF = new SizeF(diameter, diameter);
                    arc = new RectangleF(baseRect.Location, sizeF);
                    path.AddArc(arc, 90, 180);
                    arc.X = baseRect.Right - diameter;
                    path.AddArc(arc, 270, 180);
                }
                else if (baseRect.Width < baseRect.Height)
                {
                    diameter = baseRect.Width;
                    SizeF sizeF = new SizeF(diameter, diameter);
                    arc = new RectangleF(baseRect.Location, sizeF);
                    path.AddArc(arc, 180, 180);
                    arc.Y = baseRect.Bottom - diameter;
                    path.AddArc(arc, 0, 180);
                }
                else path.AddEllipse(baseRect);
            }
            catch { path.AddEllipse(baseRect); }
            finally { path.CloseFigure(); }
            return path;
        }

        /// <summary>
        /// Draws a rounded rectangle specified by a pair of coordinates, a width, a height and the radius 
        /// for the arcs that make the rounded edges.
        /// </summary>
        /// <param name="brush">System.Drawing.Pen that determines the color, width and style of the rectangle.</param>
        /// <param name="x">The x-coordinate of the upper-left corner of the rectangle to draw.</param>
        /// <param name="y">The y-coordinate of the upper-left corner of the rectangle to draw.</param>
        /// <param name="width">Width of the rectangle to draw.</param>
        /// <param name="height">Height of the rectangle to draw.</param>
        /// <param name="radius">The radius of the arc used for the rounded edges.</param>

        public static void DrawRoundedRectangle(
            this Graphics graphics,
            Pen pen,
            float x,
            float y,
            float width,
            float height,
            float radius)
        {
            RectangleF rectangle = new RectangleF(x, y, width, height);
            GraphicsPath path = graphics.GenerateRoundedRectangle(rectangle, radius);
            SmoothingMode old = graphics.SmoothingMode;
            graphics.SmoothingMode = SmoothingMode.AntiAlias;
            graphics.DrawPath(pen, path);
            graphics.SmoothingMode = old;
        }

        /// <summary>
        /// Draws a rounded rectangle specified by a pair of coordinates, a width, a height and the radius 
        /// for the arcs that make the rounded edges.
        /// </summary>
        /// <param name="brush">System.Drawing.Pen that determines the color, width and style of the rectangle.</param>
        /// <param name="x">The x-coordinate of the upper-left corner of the rectangle to draw.</param>
        /// <param name="y">The y-coordinate of the upper-left corner of the rectangle to draw.</param>
        /// <param name="width">Width of the rectangle to draw.</param>
        /// <param name="height">Height of the rectangle to draw.</param>
        /// <param name="radius">The radius of the arc used for the rounded edges.</param>

        public static void DrawRoundedRectangle(
            this Graphics graphics,
            Pen pen,
            int x,
            int y,
            int width,
            int height,
            int radius)
        {
            graphics.DrawRoundedRectangle(
                pen,
                Convert.ToSingle(x),
                Convert.ToSingle(y),
                Convert.ToSingle(width),
                Convert.ToSingle(height),
                Convert.ToSingle(radius));
        }

        /// <summary>
        /// Fills the interior of a rounded rectangle specified by a pair of coordinates, a width, a height
        /// and the radius for the arcs that make the rounded edges.
        /// </summary>
        /// <param name="brush">System.Drawing.Brush that determines the characteristics of the fill.</param>
        /// <param name="x">The x-coordinate of the upper-left corner of the rectangle to fill.</param>
        /// <param name="y">The y-coordinate of the upper-left corner of the rectangle to fill.</param>
        /// <param name="width">Width of the rectangle to fill.</param>
        /// <param name="height">Height of the rectangle to fill.</param>
        /// <param name="radius">The radius of the arc used for the rounded edges.</param>

        public static void FillRoundedRectangle(
            this Graphics graphics,
            Brush brush,
            float x,
            float y,
            float width,
            float height,
            float radius)
        {
            RectangleF rectangle = new RectangleF(x, y, width, height);
            GraphicsPath path = graphics.GenerateRoundedRectangle(rectangle, radius);
            SmoothingMode old = graphics.SmoothingMode;
            graphics.SmoothingMode = SmoothingMode.AntiAlias;
            graphics.FillPath(brush, path);
            graphics.SmoothingMode = old;
        }

        /// <summary>
        /// Fills the interior of a rounded rectangle specified by a pair of coordinates, a width, a height
        /// and the radius for the arcs that make the rounded edges.
        /// </summary>
        /// <param name="brush">System.Drawing.Brush that determines the characteristics of the fill.</param>
        /// <param name="x">The x-coordinate of the upper-left corner of the rectangle to fill.</param>
        /// <param name="y">The y-coordinate of the upper-left corner of the rectangle to fill.</param>
        /// <param name="width">Width of the rectangle to fill.</param>
        /// <param name="height">Height of the rectangle to fill.</param>
        /// <param name="radius">The radius of the arc used for the rounded edges.</param>

        public static void FillRoundedRectangle(
            this Graphics graphics,
            Brush brush,
            int x,
            int y,
            int width,
            int height,
            int radius)
        {
            graphics.FillRoundedRectangle(
                brush,
                Convert.ToSingle(x),
                Convert.ToSingle(y),
                Convert.ToSingle(width),
                Convert.ToSingle(height),
                Convert.ToSingle(radius));
        }
    }