如何用C#写旋转的五角星

用C# 编写一个Windows应用程序，界面显示一个旋转的五角星，怎么写算法?

创建轨迹梯度,渐变五角星,C#源代码
// Put the points of a polygon in an array.
Point[] points = {
new Point(75, 0),
new Point(100, 50),
new Point(150, 50),
new Point(112, 75),
new Point(150, 150),
new Point(75, 100),
new Point(0, 150),
new Point(37, 75),
new Point(0, 50),
new Point(50, 50)};

// Use the array of points to construct a path.
GraphicsPath path = new GraphicsPath();
path.AddLines(points);

// Use the path to construct a path gradient brush.
PathGradientBrush pthGrBrush = new PathGradientBrush(path);

// Set the color at the center of the path to red.
pthGrBrush.CenterColor = Color.FromArgb(255, 255, 0, 0);

// Set the colors of the points in the array.
Color[] colors = {
Color.FromArgb(255, 0, 0, 0),
Color.FromArgb(255, 0, 255, 0),
Color.FromArgb(255, 0, 0, 255),
Color.FromArgb(255, 255, 255, 255),
Color.FromArgb(255, 0, 0, 0),
Color.FromArgb(255, 0, 255, 0),
Color.FromArgb(255, 0, 0, 255),
Color.FromArgb(255, 255, 255, 255),
Color.FromArgb(255, 0, 0, 0),
Color.FromArgb(255, 0, 255, 0)};

pthGrBrush.SurroundColors = colors;

// Fill the path with the path gradient brush.
e.Graphics.FillPath(pthGrBrush, path);