C#绘制带控制点的Bezier曲线，用于点阵图像及矢量图形

【摘要】不借助第三方, 使用c# + GDI+进行SVG等绘图，绘制带控制点的Bezier曲线。可用于点阵图像及矢量图形（如SVG）绘图。

先看效果：
(不知为何，已两次上传图片，无法显示，求助csdn)

图注：使用方法二绘制。


方法一：
/// <summary>
/// Bezier样条曲线
/// </summary>
public static class BezierSpline
{
	/// <summary>
	/// Get open-ended Bezier Spline Control Points.
	/// </summary>
	/// <param name="knots">Input Knot Bezier spline points.</param>
	/// <param name="firstControlPoints">Output First Control points
	/// array of knots.Length - 1 length.</param>
	/// <param name="secondControlPoints">Output Second Control points
	/// array of knots.Length - 1 length.</param>
	/// <exception cref="ArgumentNullException"><paramref name="knots"/>
	/// parameter must be not null.</exception>
	/// <exception cref="ArgumentException"><paramref name="knots"/>
	/// array must contain at least two points.</exception>
	public static void GetCurveControlPoints(Point[] knots,
		out Point[] firstControlPoints, out Point[] secondControlPoints)
	{
		if (knots == null)
			throw new ArgumentNullException("knots");
		int n = knots.Length - 1;
		if (n < 1)
			throw new ArgumentException
			("At least two knot points required", "knots");
		if (n == 1)
		{ // Special case: Bezier curve should be a st