using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;
/// <summary>
/// 
/// </summary>
public class TestA : MonoBehaviour {

    public GameObject trg = null;

    public Image moveImg = null;

    public Vector3 sencePos;

    public Canvas canvas;//画布
    private RectTransform rectTransform;//坐标

    void Start()
    {
        canvas = GetComponent<Canvas>();
        rectTransform = canvas.transform as RectTransform; //也可以写成this.GetComponent<RectTransform>(),但是不建议；

    }

    void Update()
    {
        //sencePos = CameraManager.Instance.SenceCamara.WorldToScreenPoint(trg.transform.position);
        //moveImg.transform.position = CameraManager.Instance.SenceUICamera.ScreenToWorldPoint(sencePos);

        Vector3 uiCenterPos = WorldToGUI(trg.transform.position);
        //Debug.LogError("3:屏幕中心:打到己方中心位置....." + trg.transform.position.ToString ()+"/"+  uiCenterPos.ToString());
        moveImg.transform.localPosition = WorldToGUI(trg.transform.position);
        //if (Input.GetMouseButtonDown(0))
        //{
        //    Vector2 pos;
        //    if (RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, trg.transform.position, canvas.worldCamera, out pos))
        //    {
        //        //rectTransform.anchoredPosition = pos;
        //        moveImg.transform.localPosition = pos;
        //        Debug.Log(pos);
        //    }
        //} 
        
    }

    void OnGUI()
    {
        //if (GUI.Button(new Rect(10, 10, 100, 100), "hide"))
        //{
        //    this.a.CrossFadeAlpha(0f, 0, false);
        //}
        //if (GUI.Button(new Rect(10, 130, 100, 100), "Idle"))
        //{
        //    this.a.CrossFadeAlpha(1f, 0, false);
        //}

    }
    /// <summary>
    /// 
    /// </summary>
    /// <returns></returns>
    Vector2 WorldToGUI(Vector3 orgPos)
    {
        Vector2 pos;
        Vector3 screenPos = CameraManager.Instance.SenceCamara.WorldToScreenPoint(orgPos);
        RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform,
            screenPos, CameraManager.Instance.SenceUICamera, out pos);
        return pos;
    }
}