c# - C# 规范化（像一个向量）

Question

我的移动对象中的代码：

ObjectX.Location.Add(Velocity * Utils.GetMoveDir(start, destination));

实用功能：

    public static PointF GetMoveDir(PointF start, PointF destination)
    {
        PointF substraction = destination.SubStract(start);
        if (substraction == PointF.Empty) // If-statement is needed because normalizing a zero value results in a NaN value
            return PointF.Empty;
        else
            return substraction.Normalize(); // <<<< I need something for this
    }

我无法工作的扩展：

    public static PointF Normalize(this PointF A)
    {
        throw new NotImplementedException(); // How do I solve this to make it like: http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.vector2.normalize.aspx
    }

请注意，我不使用 XNA 框架。

Answer 1

public static PointF Normalize(this PointF A)
{
    float distance = Math.Sqrt(A.X * A.X + A.Y * A.Y);
    return new PointF(A.X / distance, A.Y / distance);
}

另请参阅此处的第一段以了解什么是归一化向量（单位向量）以及如何计算它。

Answer 2

public static PointF Normalize(this PointF A)
{
    float length = Math.Sqrt( A.X*A.X + A.Y*A.Y);
    return new PointF( A.X/length, A.Y/length);
}