XNA格斗类游戏动画循环问题

我已经在这方面工作了相当长的一段时间,在不同的地方寻找解决方案。我使用了Nick Gravelyn将动画存储到文本文件中的风格,只是增加一个索引来更改帧。我遇到的麻烦是循环动画一次,而且只有一次,但由于某种原因,我知道应该工作的方式不是工作的方式,我认为它会。我一辈子都搞不懂为什么,除非它非常具体地说明XNA是如何工作的。

这是我的密码:

private void UpdateAttack(KeyboardState current, KeyboardState last, GameTime gameTime)
        {
           if (current.IsKeyDown(Keys.S) && last.IsKeyUp(Keys.S))
           {
               neutralStandingKick(gameTime);
           }
        }   

        private void neutralStandingKick(GameTime gameTime)
        {
            //timeSinceLastFrame += gameTime.ElapsedGameTime.Milliseconds; //Framerate control
            //if (timeSinceLastFrame > millisecondsPerFrame) //Framerate control
            //{
                //timeSinceLastFrame -= millisecondsPerFrame; //Framerate control
                if (mCurrentState != State.Kicking)
                {
                    mCurrentState = State.Kicking;

                    Position.Y = 200;

                    loopOnce(25, 30); //Starts at frame 25, ends at 30
                }
            //}
        }

        private void loopOnce(int min, int max)
        {
            if (currentImageIndex > max || currentImageIndex < min) //Checks to see if index out of range of current animation
                currentImageIndex = min; //Starts at the beginning of the animation
            for (int i = min; i < max; i++) //Uses the range to determine when to stop
            { currentImageIndex++; } //Increments index each iteration that passes
        }

Edit:这里是这个特殊类的Draw方法

public void Draw(SpriteBatch spriteBatch)
{
    //Get the name of the current sprite to draw
    string spriteName = possibleImages[currentImageIndex];

    //Use that to get the source rectangle
    Rectangle source = spriteSourceRectangles[spriteName];

    //Send rectangle to a function to set the framesize for bounds checking
    getFrameSize(source);

    spriteBatch.Draw(theSpriteSheet, Position, source, Color.White);
}

private void getFrameSize(Rectangle frame)
{
    frameSize = frame; //For bounds checking
}

为什么这样不行?

新代码(加文的建议):

private void UpdateAttack(KeyboardState current, KeyboardState last, GameTime gameTime)
{
    const int min = 22;
    const int max = 30;

    timeSinceLastFrame += gameTime.ElapsedGameTime.Milliseconds; //Framerate control

           if (current.IsKeyDown(Keys.S) && mCurrentState != State.Kicking)
           {
               mCurrentState = State.Kicking;
               currentImageIndex = min;
           }
           if (mCurrentState == State.Kicking)
           {
               if (timeSinceLastFrame > millisecondsPerFrame) //Framerate control
               {
                   timeSinceLastFrame -= millisecondsPerFrame; //Framerate control
                   currentImageIndex++;
               }
           }
           if (currentImageIndex == max)
               mCurrentState = State.Idle;
}

调用UpdateAttack的方法:

public void Update(GameTime theGameTime, Game game)
{
    KeyboardState aCurrentKeyboardState = Keyboard.GetState();

    UpdateMovement(aCurrentKeyboardState);
    UpdateJump(aCurrentKeyboardState);
    UpdateAttack(aCurrentKeyboardState, mPreviousKeyboardState, theGameTime);
    UpdateStageBounds(game);

    mPreviousKeyboardState = aCurrentKeyboardState;
}

它将在按住键盘键“s”时循环播放动画。但它不会像预期的那样在一次按键中循环所有7帧。