C# 旋转后，如何沿精灵面对的方向移动精灵？

我可以通过船精灵上下左右移动，以及旋转它。然而，当按下“向上”键时，我希望船沿着船头的方向移动，而不是总是向上移动。我想我可以在update方法中的某个地方粘贴一个vector2变量，该变量始终指向精灵的顶端，但我无法理解如何“硬编码”精灵上的坐标

我将在下面发布我的船舶等级，我认为事情有点混乱，任何关于清理代码的建议都是欢迎的

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;


//width = 62 pixels
//height = 179 pixels

namespace my_first_game
{
class Ship
{

    private Vector2 position = new Vector2(300, 300);
    private int radius = 50;
    private bool ismoving = false;
    private Dir direction = Dir.down;
    private int health = 3;
    private float speed = 100;
    public float angle = 0;
    public double turntime = .5d;

    private float velocity = 10f;
    private float drifttime = 0f;

   // Constructor for the ship class
   public Ship(int shiphealth)
    {
        shiphealth = health;
    }

    //getter/setter for angle
     public float Get_angle
     {
         get { return angle; }
        set { value = angle; }

     }         

    //get and set health
    public int Health
    {
        get { return health; }
        set { value = health; }
    }

    // get and set the ship's position
    public Vector2 Position
    {
        get{ return position; }
        set { value = position; }
    }

    public void SetAngle (float f)
    {
        angle = MathHelper.ToDegrees(f);
    }

    //update loop for the ship's state
    public void update_ship(GameTime gameTime)
    {
        KeyboardState kstate = Keyboard.GetState();
        float dt = (float)gameTime.ElapsedGameTime.TotalSeconds;

        float rotation = 0.02f;

        //Vector2 Direction = new Vector2((float)Math.Cos(angle + 45), (float)Math.Sin(angle));
        //Direction.Normalize();           

        //if keys are pressed, the ship moves until the keys are unpressed

        if (kstate.IsKeyDown(Keys.W))
        {
            direction = Dir.up;
            ismoving = true;
        }
        if (kstate.IsKeyDown(Keys.A))
        {
            direction = Dir.left;
            ismoving = true;
        }
        if (kstate.IsKeyDown(Keys.D))
        {
            direction = Dir.right;
            ismoving = true;
        }
        if (kstate.IsKeyDown(Keys.S))
        {
            direction = Dir.down;
            ismoving = true;
        }
        if(kstate.IsKeyDown(Keys.W) && kstate.IsKeyDown(Keys.D))
        { direction = Dir.up_right;
            ismoving = true;
        }
        if(kstate.IsKeyDown(Keys.W) && kstate.IsKeyDown(Keys.A))
        {
            direction = Dir.up_left;
            ismoving = true;
        }
        if (kstate.IsKeyDown(Keys.S) && kstate.IsKeyDown(Keys.D))
        { direction = Dir.down_right;
            ismoving = true;
        }
        if (kstate.IsKeyDown(Keys.S) && kstate.IsKeyDown(Keys.A))
        {
            direction = Dir.down_left;
            ismoving = true;
        }

            //"ismoving" is used as a flag to move the ship if keys are held
            //angle also rotates the boat when "A" and "D" are pressed
            if (ismoving) {

            switch (direction)
            {
                case Dir.up:
                    position.Y -= speed * dt;
                    ismoving = false;
                    break;

                case Dir.down:

                    position.Y += speed * dt;
                    ismoving = false;
                    break;

                case Dir.left:

                    angle -= rotation;
                    ismoving = false;
                    break;

                case Dir.right:
                    angle += rotation;
                    ismoving = false;
                    break;

                case Dir.up_right:
                    position.Y -= speed * dt;
                    position.X += speed * (float)turntime * dt;
                    angle += rotation;
                    ismoving = false;
                    break;

                case Dir.up_left:
                    position.Y -= speed * dt;
                    position.X -= speed * (float)turntime * dt;
                    angle -= rotation;
                    ismoving = false;
                    break;
                case Dir.down_right:
                    position.Y += speed * dt;
                    position.X += speed * (float)turntime * dt;
                    angle += rotation;
                    ismoving = false;
                    break;
                case Dir.down_left:
                    position.Y += speed * dt;
                    position.X -= speed * (float)turntime * dt;
                    angle -= rotation;
                    ismoving = false;
                    break;

                default: break;
            }
            }   
        }
    }
}

以下是我的船的相关绘制方法：

//create a new rectangle around the ship_sprite
        Rectangle ship_rectangle = new Rectangle(0, 0, ship_sprite.Width, 
ship_sprite.Height);

        Vector2 origin = new Vector2(31, 160);


        spriteBatch.Draw(ship_sprite, ship.Position, ship_rectangle, 
Color.White, ship.angle, origin, 1.0f, SpriteEffects.None, 1);

我怀疑这个问题是否有一个“正确”的答案，但我要做的是使用“角度”属性来确定按下“向上”按钮时的移动

我沿着三角线思考-你的半径就是船的速度。然后你会按照（伪代码！）的思路做一些事情：

这假设角度=0对应于正常平面上0度的标准解释（因此面向右侧）。如果不是这样，您需要进行相应的调整

---

警告：我自己还没有编写过类似的代码，所以这只是我对如何实现的估计。我鼓励您进行试验，看看不同的方法是如何工作的。

经过一番修补，我找到了一个适合我的解决方案

Vector2 direction = new Vector2((float)Math.Cos(angle + 30), 
(float)Math.Sin(angle + 30));

然后，当按下“向上”键时，您可以简单地将船的位置设置为其当前位置加上船的角度。这两者之和可以乘以时间差和船的速度

if(kstate.IsKeyDown(Keys.W))
{
  position = position + direction * dt * speed;   
}

---

代码清理建议：注意两个条件块（if块和big Switch（）块）都包含在每个分支中执行的代码，特别是isMoving=true和isMoving=false。建议把它放在条件句后面，而不是分支里面。哇，是的，我想我根本不需要那个switch语句。谢谢。在某些情况下，拥有一个“完美”的解决方案并不重要，但只要这个问题不会导致基于观点的答案，那么一个有助于解决问题的答案已经足够有用了。

if(kstate.IsKeyDown(Keys.W))
{
  position = position + direction * dt * speed;   
}