统一中对象的动态变化速度

Question

我需要一个物体根据动态的时间来上下移动。确切的位置存储在一个名为Timings的List()中。这将包含排序条目，如0.90 1.895 2.64 3.98.这些时间是相对的音乐播放，所以他们可以比较TheMusic.time。(TheMusic是我的AudioSource)

现在(请参阅下面的代码)，它正在使用moveSpeed静态地上下移动。我怎样才能做到这一点，这样就可以在预定义的时间到达顶部和底部了？当它到达时间列表的末尾时，移动应该停止。

public class Patrol : MonoBehaviour {

    public Transform[] patrolPoints;  //contains top and bottom position
    public float moveSpeed; //needs to be changed dynamically

    private int currentPoint; 

    // Initialization
    void Start () {
        transform.position = patrolPoints [0].position;
        currentPoint = 0;
    }

    // Update is called once per frame
    void Update () {

        print (currentPoint);
        if (currentPoint >= patrolPoints.Length) {
            currentPoint = 0;
        }

        if (transform.position == patrolPoints [currentPoint].position) {
            currentPoint++;
        }

        transform.position = Vector3.MoveTowards (transform.position, patrolPoints[currentPoint].position, moveSpeed * Time.deltaTime);

    }
}

重要的是，绝不能偏离绝对时间点。当时间达到一个很高的时间，比如1009时，就不会有太多的偏差。

还请注意，其他事情(如更改颜色和检查用户行为)需要同时发生，请参阅我的其他问题。

Answer 1

您的解决方案的路径是这答案，它显示了随着时间推移移动GameObject的函数。

有了这个函数，您就可以在包含List的beatsTimer上启动一个coroutine循环。在每个循环中，您应该有一个变量，用于确定在每个循环之后是向上还是下行。在我的示例中，我将该变量命名为upDownMoveDecider。这个变量将决定使用patrolPoints数组的哪个索引。(我假设索引和1只有两个点)。

另外，每次都可以在for循环中调用for函数。确保对其进行yield，以便它在进入下一个函数之前等待moveToX函数完成或返回。

以下是应该是什么样子：

public Transform[] patrolPoints;  //contains top and bottom position
List<float> beatsTimer = new List<float>();
public Transform objectToMove;

void Start()
{
    //For testing purposes
    beatsTimer.Add(0.90f);
    beatsTimer.Add(1.895f);
    beatsTimer.Add(2.64f);
    beatsTimer.Add(3.98f);

    //Start the moveobject
    StartCoroutine(beginToMove());
}

IEnumerator beginToMove()
{
    // 0 = move up, 1 = move down
    int upDownMoveDecider = 0;

    //Loop through the timers
    for (int i = 0; i < beatsTimer.Count; i++)
    {
        if (upDownMoveDecider == 0)
        {
            //Move up
            Debug.Log("Moving Up with time: " + beatsTimer[i] + " in index: " + i);
            //Start Moving and wait here until move is complete(moveToX returns)
            yield return StartCoroutine(moveToX(objectToMove, patrolPoints[upDownMoveDecider].position, beatsTimer[i]));

            //Change direction to 1 for next move
            upDownMoveDecider = 1;
        }
        else
        {
            //Move down
            Debug.Log("Moving Down with time: " + beatsTimer[i] + " in index: " + i);
            //Start Moving and wait here until move is complete(moveToX returns)
            yield return StartCoroutine(moveToX(objectToMove, patrolPoints[upDownMoveDecider].position, beatsTimer[i]));

            //Change direction to 0 for next move
            upDownMoveDecider = 0;
        }
    }
}

IEnumerator moveToX(Transform fromPosition, Vector3 toPosition, float duration)
{
    float counter = 0;

    //Get the current position of the object to be moved
    Vector3 startPos = fromPosition.position;

    while (counter < duration)
    {
        counter += Time.deltaTime;
        fromPosition.position = Vector3.Lerp(startPos, toPosition, counter / duration);
        yield return null;
    }
}

for循环中的代码很长，但更容易理解。下面是没有if/else语句的较短版本。

//Loop through the timers
for (int i = 0; i < beatsTimer.Count; i++)
{
    //Move up/Down depening on the upDownMoveDecider variable
    string upDown = (upDownMoveDecider == 0) ? "Up" : "Down";
    Debug.Log("Moving " + upDown + " with time: " + beatsTimer[i] + " in index: " + i);

    //Start Moving and wait here until move is complete(moveToX returns)
    yield return StartCoroutine(moveToX(objectToMove, patrolPoints[upDownMoveDecider].position, beatsTimer[i]));

    //Change direction
    upDownMoveDecider = (upDownMoveDecider == 1) ? 0 : 1;
}

Answer 2

添加一个浮点数数组，比如public float[] moveSpeedArray;

可以根据需要在Start()或编辑器中填充此数组。

您已经获得并更新了currentPoint。

将该currentPoint作为moveSpeedArray的索引。

就像；

transform.position = Vector3.MoveTowards (transform.position, patrolPoints[currentPoint].position, moveSpeedArray[currentPoint] * Time.deltaTime);

因此，您可以将对象移动到不同预定义时间的位置。

希望这能有所帮助！干杯!

Answer 3

别重新发明轮子。使用图文库，例如iTween。有超过20种宽松类型为您定义：

​

​

示例代码：

iTween.MoveBy(gameObject,iTween.Hash(
 "x"   , 2,
 "time", 0.2f
));