实现星球Drag&Swipe

用了几个手势插件，发现都不能完美的实现类似IOS的Drag&Swipe效果，
自己实现了一个

示例

实现代码

    using UnityEngine;

    public class DragTween : MonoBehaviour
    {
    public Transform target;

    public bool igoneTimeScale;
    private Vector2 axis;           //lerp方向量
    private Vector3 fristPressPos;       //第一次按下的坐标
    private Vector2 toSpeed;        //鼠标移动的量
    private Vector3 lastPos;        //上次的坐标
    private Vector3 lastDelta;      //上次抬起的坐标
    public void Update()
    {
        MouseInput();
    }

    
    private void MouseInput()
    {
        if (Input.GetMouseButtonDown(0))
        {
            fristPressPos = lastPos= Input.mousePosition;
            axis = Vector2.zero;
        
            OnPress(true, fristPressPos);
        }
        if(Input.GetMouseButtonUp(0))
        {
            OnPress(false, Input.mousePosition);
        }

        toSpeed= Vector2.zero;

        if(Input.GetMouseButton(0))
        {
            toSpeed.x = Input.GetAxis("Mouse X");
            toSpeed.y = Input.GetAxis("Mouse Y");
            lastDelta= Input.mousePosition - lastPos;
            if(lastDelta != Vector3.zero)
            {
                OnDrag(lastDelta, Input.mousePosition);
                lastPos = Input.mousePosition;
            }
        }
        else
        {
            if(axis!=Vector2.zero)
                OnSwipe(axis, lastDelta);
        }

        var time = igoneTimeScale ? Time.unscaledDeltaTime : Time.deltaTime;

        axis=Vector2.Lerp(axis, toSpeed / time, 0.5f * time);

    
    }

    private void OnPress(bool isPress,Vector2 pressPos)
    {
    }
    /// 

    /// 当滑动的时候
    /// 
    /// 这一次鼠标位置减去上一帧鼠标位置的向量
    /// 当前鼠标坐标
    private void OnDrag(Vector2 delta,Vector2 currentPos)
    {
        float angle = delta.magnitude;
        Vector3 axis = Vector3.Cross(delta, transform.forward);
        target.RotateAround(target.position, axis, angle / Mathf.PI);
    }

    private void OnSwipe(Vector2 force,Vector2 lastDelta)
    {
        float f = force.magnitude;
        float angle = lastDelta.magnitude;
        Vector3 axis = Vector3.Cross(lastDelta, transform.forward);
        target.RotateAround(target.position, axis, angle * f  / Mathf.PI);
    }

}