using UnityEngine;
using System.Collections;

public class mouse : MonoBehaviour {
//private Vector3 lasePos;
private Vector3 offSet;
private Vector3 ScreenSpace;
//1.
void OnMouseDown()
{
ScreenSpace = Camera.main.WorldToScreenPoint(transform.position);
offSet = transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, ScreenSpace.z));

    //lasePos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, ScreenSpace.z));  
    print("down");  
}

//2.  
void OnMouseUp()  
{  
    print("up");  
}

//3.  
void OnMouseDrag()  
{  
    Vector3 curScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, ScreenSpace.z);  
    Vector3 CurPosition = Camera.main.ScreenToWorldPoint(curScreenSpace) + offSet;  
    transform.position = CurPosition;  
    //Vector3 curPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, ScreenSpace.z));  
    //Vector3 gapPos = curPos - lasePos;  
    //transform.position = transform.position + gapPos;  
    //lasePos = curPos;

    print("drag");  
}

//4.当鼠标移动到内部时  
void OnMouseEnter()  
{  
    print("enter");  
}  
//5.当鼠标离开内部时  
void OnMouseExit()  
{  
    print("exit");  
}  
//6.当鼠标持续停留在内部时  
void OnMouseOver()  
{  
    print("over");  
}  
//7.鼠标停留在内部释放时调用  
void OnMouseUpAsButton()  
{  
    print("upAsButton");  
}  

}