/// <summary>
/// Draws a glowing border around a given rectangle.
/// </summary>
/// <param name="g">The current Graphics object.</param>
/// <param name="content">The rectangle that should contain the content.</param>
/// <param name="glowColor">The color of the glow effect (will become 50 percent transparent).</param>
/// <param name="size">The size of the glow effect.</param>
/// <param name="radius">The optional radius for rounded corners.</param>
public static void Glow(this Graphics g, Rectangle content, Color glowColor, int size = 10, float radius = 0)
{
var rect = new Rectangle(content.Left - size, content.Top - size, content.Width + 2 * size, 2 * size + content.Height);
var gp = new GraphicsPath();
gp.AddRoundRectangle(rect, radius);
var pgb = new PathGradientBrush(gp);
pgb.CenterColor = glowColor;
pgb.SurroundColors = new Color[] { Color.FromArgb(0, 0, 0, 0) };
g.FillRectangle(pgb, rect);
}
/// <summary>
/// Adds a rectangle with round corners to the current GraphicsPath.
/// </summary>
/// <param name="gp">The current GraphicsPath object.</param>
/// <param name="rectangle">The rectangle which defines the area to be added.</param>
/// <param name="radius">The radius of the different corners starting with the upper left corner.</param>
/// <returns>The current GraphicsPath object.</returns>
public static GraphicsPath AddRoundRectangle(this GraphicsPath gp, RectangleF rectangle, params float[] radius)
{
return(gp.AddRoundRectangle(rectangle.Location, rectangle.Size, radius));
}
/// <summary>
/// Adds a rectangle with round corners to the current GraphicsPath.
/// </summary>
/// <param name="gp">The current GraphicsPath object.</param>
/// <param name="rectangle">The rectangle which defines the area to be added.</param>
/// <param name="radius">The radius of the different corners starting with the upper left corner.</param>
/// <returns>The current GraphicsPath object.</returns>
public static GraphicsPath AddRoundRectangle(this GraphicsPath gp, Rectangle rectangle, params float[] radius)
{
return(gp.AddRoundRectangle((RectangleF)rectangle, radius));
}
