如何在相机视图边界内移动2D对象 [英] How to move 2D Object within camera view boundary

问题描述

我有一个场景，我的相机没有跟随我的播放器.当播放器到达摄像机末端时，我希望播放器不能走得更远(超出摄像机视图范围).我该怎么办?

I have a scene that my camera doesn't follow my player. When player reaches the end of camera I want player to can't go further (out of camera view). How can I do this?

我的移动代码

public class PlayerBlueController : MonoBehaviour {

public float speed;
private float x;



// Use this for initialization
void Start () {


}

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

    x = Input.GetAxis ("Horizontal") / 100 * speed;
    transform.Translate (x,0,0);

}
}

从中您可以看到.它脱离了相机的视野.

As you can see from this. It gets out of camera's view.

推荐答案

我注意到您使用了Collider2D. 您应该使用Rigidbody2D.MovePosition而不是transform.Translate ，否则在使用transform.Translate时可能会遇到问题.

I noticed you used a Collider2D. You should be using Rigidbody2D.MovePosition instead of transform.Translate or you'll likely run into issues when transform.Translate is used.

1 .获取最终移动位置，并使用Camera.main.WorldToViewportPoint

1.Take the final move position and convert it to new position in ViewPortPoint with Camera.main.WorldToViewportPoint

2 .将Mathf.Clamp的限制应用于#1 中的结果.

2.Apply a limit with Mathf.Clamp to the result in #1.

3 .使用Camera.main.ViewportToWorldPoint将ViewPortPoint转换回世界点.

3.Convert the ViewPortPoint back to world point with Camera.main.ViewportToWorldPoint.

4 .最后，用Rigidbody2D.MovePosition移动它.

下面的代码是从 this 修改的答案包括对屏幕边界的限制.

The code below is modified from this answer to include restriction to screen boundary.

在不使用Rigidbody 的情况下移动:

Move without Rigidbody:

仅在不需要碰撞和物理的情况下使用:

public float speed = 100;
public Transform obj;

public void Update()
{
    float h = Input.GetAxis("Horizontal");
    float v = Input.GetAxis("Vertical");

    //Move only if we actually pressed something
    if ((h > 0 || v > 0) || (h < 0 || v < 0))
    {
        Vector3 tempVect = new Vector3(h, v, 0);
        tempVect = tempVect.normalized * speed * Time.deltaTime;


        Vector3 newPos = obj.transform.position + tempVect;
        checkBoundary(newPos);
    }
}

void checkBoundary(Vector3 newPos)
{
    //Convert to camera view point
    Vector3 camViewPoint = Camera.main.WorldToViewportPoint(newPos);

    //Apply limit
    camViewPoint.x = Mathf.Clamp(camViewPoint.x, 0.04f, 0.96f);
    camViewPoint.y = Mathf.Clamp(camViewPoint.y, 0.07f, 0.93f);

    //Convert to world point then apply result to the target object
    obj.position = Camera.main.ViewportToWorldPoint(camViewPoint);
}

使用Rigidbody2D 移动对象:

Move Object with Rigidbody2D:

在需要碰撞和物理的情况下使用:

Use if collision and physics are required:

public float speed = 100;
public Rigidbody2D rb;

public void Update()
{
    float h = Input.GetAxis("Horizontal");
    float v = Input.GetAxis("Vertical");

    //Move only if we actually pressed something
    if ((h > 0 || v > 0) || (h < 0 || v < 0))
    {
        Vector3 tempVect = new Vector3(h, v, 0);
        tempVect = tempVect.normalized * speed * Time.deltaTime;

        //rb.MovePosition(rb.transform.position + tempVect);

        Vector3 newPos = rb.transform.position + tempVect;
        checkBoundary(newPos);
    }
}

void checkBoundary(Vector3 newPos)
{
    //Convert to camera view point
    Vector3 camViewPoint = Camera.main.WorldToViewportPoint(newPos);

    //Apply limit
    camViewPoint.x = Mathf.Clamp(camViewPoint.x, 0.04f, 0.96f);
    camViewPoint.y = Mathf.Clamp(camViewPoint.y, 0.07f, 0.93f);

    //Convert to world point then apply result to the target object
    Vector3 finalPos = Camera.main.ViewportToWorldPoint(camViewPoint);
    rb.MovePosition(finalPos);
}

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