C＃载体，角度和旋转 [英] C# Vectors, Angles and Rotation

问题描述

我有一个飞船，有一个位置，目的地和旋转。当有一个新的目标向前移动时所有顺时针旋转，直到它正面临其目的地的时间。

I have a spaceship that has a location, destination and a rotation. When it has a new destination it moves forward all the while rotating clockwise until it is facing its destination.

code：

public void Move()
{
    Vector requiredDirection = destination - origin;
    requiredDirection.Normalize();
    Vector directionNow = new Vector((float)Math.Cos(rotation), (float)Math.Sin(rotation));

    float x = Math.Abs(requiredDirection.X - directionNow.X);
    float y = Math.Abs(requiredDirection.Y - directionNow.Y);

    if ((x > rotationSpeed) || (y > rotationSpeed))
    {
        rotation += rotationSpeed;
    }

    shipPosition += directionNow * speed;
}

我的问题是，这艘船只在旋转在一个的方向，直到它正面临着目标，我需要它，这将是最短路线的方向转动。

My problem is that the ship will only rotate in the one direction until it is facing its target, I need it to rotate in the direction that would be the shortest route.

我真的很茫然，以从哪里开始，这是矢量我第一次真正尝试。

I'm really at a loss as to where to begin, this is my first real attempt at Vectors.

推荐答案

从 directionNow 的夹角 requiredDirection 是通过 Math.Atan2（requiredDirection.Y，requiredDirection.X）鉴于 - Math.Atan2（directionNow.Y，directionNow.X）。那将是积极的逆时针转动，负向顺时针方向转动。

The angle from directionNow to requiredDirection is given by Math.Atan2(requiredDirection.Y,requiredDirection.X) - Math.Atan2(directionNow.Y,directionNow.X). That will be positive to rotate counterclockwise, negative to rotate clockwise.

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