毕竟重要的是VerticalPlane这个平面，你可以直接在Unity中创建一个Quad。然后拉到这个代码里面。
VerticalPlane.transform.up的方向，就是垂直你拖动平面的方向。所以你可以调整你VerticalPlane的角度，可以比较直观的获得你所需要垂直拖动的平面。代码应该看看都能懂，比较简单。
public class DragStuffBase : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
public Camera MainCamera;
private float depthZ;
public Vector3 InitPos;
public bool isCanDrag = false;
public float DepthZLerp = -0.3f;
private bool drag;
public Transform VerticalPlane;//垂直滑动的平面
float VerticalLineLength;
float distance;
Vector3 originPointPos;
Vector3 originObjPos;
public Vector3 LerpPos=new Vector3(0,0.2f,0);//
public void Init()
{
}
// Use this for initialization
void Start()
{
}
// Update is called once per frame
void Update()
{
}
public void OnBeginDrag(PointerEventData eventData)
{
if (DOTween.IsTweening(this.transform))
return;
if (isCanDrag)
{
depthZ = this.MainCamera.WorldToScreenPoint(this.transform.position).z;
InitPos = this.transform.position;
drag = true;
distance = eventData.pointerPressRaycast.distance; ;
VerticalLineLength = GetVerticalLine(eventData.position, distance);
originPointPos = GetWorldPos(eventData.position, distance);
originObjPos = this.gameObject.transform.position+ LerpPos;
OnBeginDragEvent(eventData);
}
}
public void OnDrag(PointerEventData eventData)
{
if (!drag)
return;
// this.transform.position = MainCamera.ScreenToWorldPoint(new Vector3(eventData.position.x, eventData.position.y, depthZ + DepthZLerp));
Vector3 tempPos = GetWorldPos(eventData.position, GetDragDistance(eventData.position));
Vector3 deltaPos = tempPos - originPointPos;
// this.transform.position = (originObjPos + deltaPos);
this.transform.position = tempPos + LerpPos;
OnDragEvent(eventData);
}
public void OnEndDrag(PointerEventData eventData)
{
if (!drag)
return;
drag = false;
OnEndDragEvent(eventData);
}
public virtual void OnBeginDragEvent(PointerEventData eventData)
{
}
public virtual void OnDragEvent(PointerEventData eventData)
{
}
public virtual void OnEndDragEvent(PointerEventData eventData)
{
}
float GetVerticalLine(Vector2 mousePos, float distance)
{
Ray objRay = MainCamera.ScreenPointToRay(mousePos);
Ray vertical = new Ray(MainCamera.transform.position, new Vector3(VerticalPlane.transform.up.x, VerticalPlane.transform.up.y, VerticalPlane.transform.up.z));
Vector3 objDir = objRay.direction;
Vector3 verticalLineDir = vertical.direction;
float angle = Vector3.Angle(objDir, verticalLineDir);
return distance * Mathf.Cos(angle * Mathf.Deg2Rad);
}
float GetDragDistance(Vector2 mousePos)
{
Ray vertical = new Ray(MainCamera.transform.position, new Vector3(VerticalPlane.transform.up.x, VerticalPlane.transform.up.y, VerticalPlane.transform.up.z));
Ray objRay = MainCamera.ScreenPointToRay(mousePos);
Vector3 objDir = objRay.direction;
Vector3 verticalLineDir = vertical.direction;
float angle = Vector3.Angle(objDir, verticalLineDir);
return VerticalLineLength / Mathf.Cos(angle * Mathf.Deg2Rad);
}
protected Vector3 GetWorldPos(Vector2 mousePos, float distance)
{
Ray ray = MainCamera.ScreenPointToRay(mousePos);
return ray.GetPoint(distance);
}
}
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