#pragma strict
//支持中文
function Start () {

}

function Update () {

}
function OnMouseDown () {
    var screenSpace = Camera.main.WorldToScreenPoint(transform.position);//三维物体坐标转屏幕坐标
    //将鼠标屏幕坐标转为三维坐标，再算出物体位置与鼠标之间的距离
    var offset = transform.position - Camera.main.ScreenToWorldPoint(Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z));
    while (Input.GetMouseButton(0))
    { 
        var curScreenSpace = Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);
        var curPosition = Camera.main.ScreenToWorldPoint(curScreenSpace) + offset;
        transform.position = curPosition;	
       //transform.position.x = curPosition.x;	
       //transform.position.z = curPosition.z;
       //world.y=transform.position.y;
       
        //if(transform.localPosition.y<-3){//火焰不能在地面以下
        // transform.localPosition.y=-3;
       //}
        yield;//这个很重要，循环执行
    }
    }