This class defines a gradient brush that shades from one color at the center of a GraphicsPath to another at each edge of the path. The CenterPoint can be set arbitrarily.

You can define a basic fade by setting the CenterColor, populating the SurroundColors array with one Color value for each of the points defining the path, and setting the Blend object.

Alternatively, you can go for a more complex fade, by setting a ColorBlend object into the InterpolationColors property.

You can also set the bounding Rectangle for the path, and the WrapMode defining how points outside that rectangle should be filled.

The path itself is set in the constructor of the object and cannot be modified subsequently, but you can apply a Transform with the usual array of helper methods, such as RotateTransform() and MultiplyTransform().

public sealed class PathGradientBrush : System.Drawing.Brush {
// Public Constructors
   public PathGradientBrush(GraphicsPath path);
   public PathGradientBrush(System.Drawing.Point[ ] points);
   public PathGradientBrush(System.Drawing.Point[ ] points, WrapMode wrapMode);
   public PathGradientBrush(System.Drawing.PointF[ ] points);
   public PathGradientBrush(System.Drawing.PointF[ ] points, WrapMode wrapMode);
// Public Instance Properties
   public Blend Blend{set; get; }
   public Color CenterColor{set; get; }
   public PointF CenterPoint{set; get; }
   public PointF FocusScales{set; get; }
   public ColorBlend InterpolationColors{set; get; }
   public RectangleF Rectangle{get; }
   public Color[ ] SurroundColors{set; get; }
   public Matrix Transform{set; get; }
   public WrapMode WrapMode{set; get; }
// Public Instance Methods
   public override object Clone();  // overrides System.Drawing.Brush
   public void MultiplyTransform(Matrix matrix);
   public void MultiplyTransform(Matrix matrix, MatrixOrder order);
   public void ResetTransform();
   public void RotateTransform(float angle);
   public void RotateTransform(float angle, MatrixOrder order);
   public void ScaleTransform(float sx, float sy);
   public void ScaleTransform(float sx, float sy, MatrixOrder order);
   public void SetBlendTriangularShape(float focus);
   public void SetBlendTriangularShape(float focus, float scale);
   public void SetSigmaBellShape(float focus);
   public void SetSigmaBellShape(float focus, float scale);
   public void TranslateTransform(float dx, float dy);
   public void TranslateTransform(float dx, float dy, MatrixOrder order);
}

Hierarchy

System.Object System.MarshalByRefObject System.Drawing.Brush(System.ICloneabl, System.IDisposable) PathGradientBrush