《愤怒的小鸟》弹弓实现

using UnityEngine;using System.Collections;public class Ball : MonoBehaviour {    private Vector3 MousePosition;    private LineRenderer leftLine;    private LineRenderer rightLine;    void Start()    {        leftLine = GameObject.Find("Shootor").transform.Find("RopeL").transform.GetComponent<LineRenderer>();        leftLine = GameObject.Find("Shootor").transform.Find("RopeR").transform.GetComponent<LineRenderer>();    }    void Update()    {        if(Input .GetMouseButton (0))        {            MousePosition = Camera.main.ScreenToViewportPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, -2f));            transform.position = MousePosition;            leftLine.SetPosition(0, new Vector3(MousePosition.x, MousePosition.y, MousePosition.z - 0.5f));            rightLine.SetPosition(0, new Vector3(MousePosition.x, MousePosition.y, MousePosition.z - 0.5f));        }        if(Input .GetMouseButtonUp (0))        {            MousePosition = Camera.main.ScreenToViewportPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, -2f));            transform.position = MousePosition;            leftLine.SetPosition(0, new Vector3(MousePosition.x, MousePosition.y, MousePosition.z - 0.5f));            rightLine.SetPosition(0, new Vector3(MousePosition.x, MousePosition.y, MousePosition.z - 0.5f));            Vector3 left = new Vector3(-2f - MousePosition.x, 1.8f - MousePosition.y, -MousePosition.z);            Vector3 right = new Vector3(2f - MousePosition.x, 1.8f - MousePosition.y, -MousePosition.z);            Vector3 dir = (left + right).normalized;            transform.GetComponent<Rigidbody>().useGravity = true;            transform.GetComponent<Rigidbody>().AddForce(dir * 10f, ForceMode.Impulse);            leftLine.SetPosition(0, new Vector3(0, 1.8f, 0));            rightLine.SetPosition(0, new Vector3(0, 1.8f, 0));        }    }}

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