XNA 跳跃简单算法和代码

最新推荐文章于 2022-04-30 21:21:46 发布

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最新推荐文章于 2022-04-30 21:21:46 发布

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原文链接：https://yq.aliyun.com/articles/391557

本文详细介绍了如何使用C#在游戏开发中实现角色的跳跃效果，包括全局参数设置、Update方法中的状态检测以及核心的高度算法函数DoJump。通过数学公式控制角色上升下降的速度和高度，实现了平滑的跳跃体验。

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全局参数：

private bool _isJumping;

private bool _jumpKeyDown;

private float _jumpHeight = 100f;

private TimeSpan _jumpTimeSpan = TimeSpan.FromMilliseconds(500);

private double _jumpStartTime;

private float _jumpStartPosition;

Update中的代码：

_jumpKeyDown = Keyboard.GetState().IsKeyDown(Keys.Space);

            squarePosition.Y = DoJump(squarePosition.Y, gameTime);

高度算法函数：

private float DoJump(float velocityY, GameTime gameTime)
{

    if (_jumpKeyDown && !_isJumping)

    {

        _isJumping = true;

        _jumpStartTime = gameTime.TotalGameTime.TotalMilliseconds;

        _jumpStartPosition = velocityY;

    }

    if (_isJumping)

    {

        var jumpTime = gameTime.TotalGameTime.TotalMilliseconds - _jumpStartTime;

        var topTime = _jumpTimeSpan.TotalMilliseconds / 2;

        if (jumpTime < _jumpTimeSpan.TotalMilliseconds)

        {

            if (jumpTime > topTime)

            {

                velocityY =

                    _jumpStartPosition-_jumpHeight - Convert(-(jumpTime - topTime) * _jumpHeight / (_jumpTimeSpan.TotalMilliseconds - topTime));

            }

            else

            {

                velocityY =_jumpStartPosition+ Convert(-( jumpTime)*_jumpHeight/topTime);

            }

        }

        else

        {

            _isJumping = false;

            velocityY = _jumpStartPosition;

        }
 
    }

    return velocityY;
}