using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class HomographyCorner : MonoBehaviour
    , IDragHandler
{
    // [AutoUI]
    public Vector2 position;

    private RectTransform draggingPlane;

    public void OnDrag(PointerEventData eventData)
    {
        if (eventData.pointerEnter != null && eventData.pointerEnter.transform as RectTransform != null)
            draggingPlane = eventData.pointerEnter.transform as RectTransform;

        var rt = GetComponent<RectTransform>();
        Vector3 globalMousePos;
        if (RectTransformUtility.ScreenPointToWorldPointInRectangle(draggingPlane, eventData.position, eventData.pressEventCamera, out globalMousePos))
        {
            rt.position = globalMousePos;
            position = globalMousePos;
            //rt.rotation = draggingPlane.rotation;
        }
    }

    public void Update()
    {
        var rt = GetComponent<RectTransform>();
        rt.position = position;
    }
}