Question

我为一个游戏编写了一个运动类，我在让一个物体沿着一条曲线接近一个目的地时遇到了一些麻烦。我已经阅读了多个其他stackoverflow的答案，但没有成功，所以我认为我打开了一个我自己的问题。

这是我的移动课程中的方法，我试图从当前位置Vector2接近目的地Vector2：

public Vector2 CurvedMove()
{
    // Where DestinationPosition and CurrentPosition are Vector2's stored in 
    // the movement class. 
    float xDistance = DestinationPosition.X - CurrentPosition.X;
    float yDistance = DestinationPosition.Y - CurrentPosition.Y;

    // Set the center of the circle once (-1 is what _circleCenter is initialized to)
    if (_circleCenter.X == -1)
    {
        // Gets the center point of our circle
        _circleCenter.X = CurrentPosition.X + (xDistance / 2.0f);
        _circleCenter.Y = CurrentPosition.Y + (yDistance / 2.0f);
    }

    float diameter = (float)Math.Sqrt((xDistance * xDistance) + (yDistance * yDistance));
    float radius = diameter / 2.0f;

    float circumference = (float)Math.PI * diameter;

    // Speed represents the number of pixels an object can move (along a straight 
    // line) in a tick
    float factor = ((float)Speed) / circumference;
    _elapsedAngle += 2.0f * (float)Math.PI * factor;

    // Math based off of this answer: http://stackoverflow.com/questions/14096138/find-the-point-on-a-circle-with-given-center-point-radius-and-degree
    _currentPosition.X = (_circleCenter.X + (float)(radius * Math.Sin(_elapsedAngle)));
    _currentPosition.Y = (_circleCenter.Y - (float)(radius * Math.Cos(_elapsedAngle)));

    if (_currentPosition == _destinationPosition)
        _reachedDestination = true;

    return CurrentPosition;
}

这可能是简单的几何形状或对基本数学的完全误解，但我无法弄明白。有什么想法吗？

沿Radius c＃XNA移动对象

0 个答案: