UNITY 2d使用宽度控制将Input.GetAxis（“ Horizo​​ntal”）转换为触摸拖动

Question

public float speed = 15f;
public float mapWidth = 5f;
private Rigidbody2D rb;

private void FixedUpdate()
 {
     float x = Input.GetAxis("Horizontal") * Time.fixedDeltaTime * speed;
     Vector2 newPosition = rb.position + Vector2.right * x;
     newPosition.x = Mathf.Clamp(newPosition.x, -mapWidth, mapWidth);
     rb.MovePosition(newPosition);
 }

How do you change the code in FixedUpdate() be in touch control for MOBILE . so when I drag the object(my player) it will follow in the Horizontal axis only BUT! it will not go off the boundaries of the camera but also controllable width like in this code. If the number is high in mapWidth it will only move a little left and right.

Answer 1

The answer from this question shows how to move object and apply boundary on the screen with WorldToViewportPoint .

You can add touch support to it by adding Input.touches.deltaPosition.x and Input.touches.deltaPosition.y under the Input.GetAxis("Horizontal") .

With both boundary and Input support added, below is what it should look like:

public float speed = 100;
public Rigidbody2D rb;

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

    //Add touch support
    if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved)
    {
        Touch touch = Input.touches[0];
        h = touch.deltaPosition.x;
        v = touch.deltaPosition.y;
    }

    //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);
}