一旦 GameState 从主菜单更改为正在播放，XNA 4 对象就不会移动

Question

在 GameState.MainMenu 时一切正常，但当我单击 btnPlay (DCButton Class) 时，它切换到 GameState.Playing（加载 map/player），但没有任何动画案例 GameState.Playing.

protected override void Update(GameTime gameTime)
{
    MouseState mouse = Mouse.GetState();

    switch (CurrentGameState)
    {
        case GameState.MainMenu:
            if (btnPlay.isClicked == true) CurrentGameState = GameState.Playing;
            btnPlay.Update(mouse);
            if (btnOptions.isClicked == true) CurrentGameState = GameState.Options;
            btnOptions.Update(mouse);
            if (btnExit.isClicked == true) Exit();
            btnExit.Update(mouse);
            break;
        case GameState.Options:
            break;
        case GameState.Playing:
            player.Update();
            // Exit();
            break;
    }

    base.Update(gameTime);
}

DCPlayer (Class) Update() 方法包括获取键盘输入和改变播放器的位置。我也试过这个：

case GameState.Playing:
    player.Position.X += 1; // <- Position is a Vector2
    break;

但这也不会为 sprite 设置动画。有谁知道为什么会这样？

注意：CurrentGameState 是一个名为 GameState 的枚举

编辑：绘图()

protected override void Draw(GameTime gameTime)
{
    GraphicsDevice.Clear(Color.CornflowerBlue);

    spriteBatch.Begin();

    switch (CurrentGameState)
    {
        case GameState.MainMenu:
            spriteBatch.Draw(mmBackgroundTexture, mmBackground, Color.White);
            btnPlay.Draw(spriteBatch);
            btnOptions.Draw(spriteBatch);
            btnExit.Draw(spriteBatch);
            break;
        case GameState.Options:
            spriteBatch.Draw(mmBackgroundTexture, mmBackground, Color.White);
            break;
        case GameState.Playing:
            int progress = level.GetLevelProgress();
            level.level = progress;
            level.LoadLevel(); // <- This is where the map gets loaded from the map file
            level.Draw(spriteBatch, Content); // <- This is were the map gets rendered
            player = new DCPlayer(Content, level.grid, graphics.GraphicsDevice); // <- Could this be the problem, I initialized it here because the grid only gets initialized when the map is loaded
            player.Draw(spriteBatch, Content); // <- Draw player in grid using map information (Vector2 DCLevel.Start)
            break;
        }
    spriteBatch.End();


    base.Draw(gameTime);
}

Answer 1

在你的绘制方法中，你每次都将玩家重新分配给一个 new 实例，这意味着它永远没有机会使用它的实际位置。根据您显示的代码的外观，您可以从 Draw 方法

中删除这一行

player = new DCPlayer(Content, level.grid, graphics.GraphicsDevice);

一旦 GameState 从主菜单更改为正在播放，XNA 4 对象就不会移动

XNA 4 objects not moving once GameState has changed from the main menu to playing

c#

xna