How to make the character move along the axis using touch?

Question

I have the following code it works, but I don't know how it works.

This is the code I found:

void Update()
{
#if UNITY_ANDROID

    if(Input.touchCount>0 && Input.GetTouch(0).phase == TouchPhase.Moved )
    {
        Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;
        float offset = touchDeltaPosition.x * 40f / 18 * Mathf.Deg2Rad;
        transform.position += new Vector3(0f, 0f, offset);
        transform.position = new Vector3(0f, 0f, Mathf.Clamp(transform.position.z, -7.1f, 7.1f));
    }     
#endif   
}

I need to move the player along the axis by touch, for example, like in the game Cube Surfer!

What I want to get (I used android emulator):

The code I wrote works well at 720x1280, but if you set the resolution to 1440x2960, the controls become too sharp. I know why this is happening because touch.delta is getting too big.

My code:

if (Input.touchCount > 0)
{
    var t = Input.GetTouch(0);

    var delta = t.deltaPosition;

    if (delta != Vector2.zero)
    {
        var offset = transform.position;

        offset.x += delta.x * Sensitivity * Time.deltaTime;

        offset.x = Mathf.Clamp(offset.x, -4f, 4f);

        transform.position = offset;
    }
}

How to fix it?

ScreenToWorldPoint this does not fit because the player moves along a spline.

Thank for help

Answer 1

Try multiplying your offset by your aspect ratio: Screen.width / Screen.height.

if (Input.touchCount > 0)
{
    var t = Input.GetTouch(0);

    var delta = t.deltaPosition;

    if (delta != Vector2.zero)
    {
        var offset = transform.position;

        offset.x += delta.x * Sensitivity * ((float) Screen.width / Screen.height) * Time.deltaTime;

        offset.x = Mathf.Clamp(offset.x, -4f, 4f);

        transform.position = offset;
    }
}

Note: you may need to adjust your sensitivity.

Answer 2

You are using Mathf.Clamp to prevent it from going out of bounds. You can use it as well to restrict the speed

offset.x += Mathf.Clamp(delta.x * Sensitivity, -_MaxSpeed, _MaxSpeed) * Time.deltaTime;

_MaxSpeed is something you would need to figure out until it matches your gameplay.