unity 关于2d物体点击后能拖动的代码

好几天没写博客了，懒散了。今天又开始记录了，关于前几天遇见的一些东西。 关于2D物体点击后能拖动的代码，必须加上2D的Collider 和钢体（Rigidbody 2D）不然脚本没用。

using UnityEngine;
using System.Collections;

public class Movement : MonoBehaviour {

private bool drag;					// 如果被拖动，则为真
private Rigidbody2D myRigidbody;	//如果我引用GameObject's Rigidbody2Ds被拖动，则为True
private bool wasKinematic;			// Flag indicating whether or not the Ridigbody

// Use this for initialization
void Start ()
{
myRigidbody = GetComponent<Rigidbody2D>();

wasKinematic = myRigidbody.isKinematic;
}

// Update is called once per frame
void Update ()
{
if (drag == true)
{
DragFunction();
}
}

// 检查是否按下鼠标按钮
void OnMouseDown()
{
drag = true;

myRigidbody.isKinematic = true;
}

// 检查鼠标按钮是否被释放
void OnMouseUp()
{

// 更新文件
if (drag == true)
myRigidbody.isKinematic = wasKinematic;
drag = false;
}

void DragFunction() {
// 我们正在将2D鼠标坐标转换为3D

float distance_to_screen = Camera.main.WorldToScreenPoint(gameObject.transform.position).z;

Vector3 pos_move = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, distance_to_screen ));

//更新GameObject位置

transform.position = new Vector3( pos_move.x, pos_move.y, pos_move.z );

}

}