using UnityEngine;
using System.Collections;public class slingShot : MonoBehaviour
{/// <summary>/// 小鸟/// </summary>public GameObject bird;/// <summary>/// 弹弓拉伸的声音/// </summary>public AudioClip slingShotSound;/// <summary>/// 飞行声音/// </summary>public AudioClip flyingSound;/// <summary>/// 弹弓橡皮筋颜色/// </summary>public Color myColor;/// <summary>/// 是否按下鼠标/// </summary>private bool isClick = false;/// <summary>/// 发射出去的小鸟/// </summary>private GameObject shot;/// <summary>/// 拉伸弹弓小鸟的位置/// </summary>private Vector3 lastKnowPosition;private Vector3 direction;/// <summary>/// [ˈmægnɪtju:d] n. 巨大，广大；重大，重要；量级；（地震）级数 /// </summary>private float magnitude;/// <summary>/// 小鸟运动的轨迹线/// </summary>public static bool isDrawing = false;/// <summary>/// 小鸟发出去后下一个小鸟是否上弹弓/// </summary>public static bool isJump = false;/// <summary>/// 飞出去的小鸟/// </summary>public static GameObject myBird;/// <summary>/// 发射的是那只小鸟/// </summary>public static int birdNumber;/// <summary>/// 画弹弓的橡皮筋/// </summary>private LineRenderer lineRenderer;private int index = 0;private Vector3 position;// Use this for initializationvoid Start(){birdNumber = -1;lineRenderer = gameObject.AddComponent<LineRenderer>();//添加对象 画两条线lineRenderer.material.color = myColor;lineRenderer.SetWidth(0.1f, 0.1f);//设置宽度lineRenderer.SetVertexCount(3);//橡皮筋两个点+小鸟一个点 ['vɜ:teks] n. 最高点；顶点；<数>（三角形、圆锥体等与底相对的）顶；（三角形、多边形等的）角的顶点
    }// Update is called once per framevoid Update(){bool isMouseDown = Input.GetMouseButton(0);if (!isClick)//拖放小鸟 没有点击
        {if (isMouseDown){Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);//把鼠标的点定义一个射线RaycastHit hit;//光线投射碰撞if (collider.Raycast(ray, out hit, 10.0f))//光线投射 选择小鸟 [distance光线的长度。]
                {isClick = true;if (birdNumber <= 1){//Instantiate()克隆原始物体，位置设置在position，设置旋转在rotation，返回的是克隆后的物体//Quaternion.identity：返回恒等式旋转（只读）。这个四元数对于“无旋转”：这个物体完全对齐于世界或父轴。shot = Instantiate(bird, transform.position, Quaternion.identity) as GameObject;//动态的生成被发射的小鸟  [ɪns'tænʃɪeɪt]  实例化 //Physics.IgnoreCollision 忽略碰撞：使碰撞体1和碰撞体2的碰撞侦测无效。Physics.IgnoreCollision(shot.collider, GetComponent<Collider>()); //忽略小鸟碰撞体shot.rigidbody.isKinematic = true;//运动属性myBird = GameObject.FindWithTag("bird0");//拉伸位置的BirdmyBird.active = false;//隐藏
                    }}}}else if (isMouseDown){var lastDirection = direction;lastKnowPosition = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0.8f));direction = transform.position - lastKnowPosition;direction.Normalize();//规范化当规范化时，一个向量保持相同的方向，但它的长度为1.0。magnitude = Mathf.Min(Vector3.Distance(transform.position, lastKnowPosition), 2.5f);//最小值:橡皮筋拉伸距离;返回两个或更多值中最小的值。shot.transform.position = transform.position + direction * (-magnitude);lineRenderer.enabled = true;//LineRenderer :线渲染器 如果启用，使被渲染的物体可见//三点：小鸟+弹弓两点lineRenderer.SetPosition(0, new Vector3(-5.1f, 2.2f, 0.1f));//弹弓橡皮筋点lineRenderer.SetPosition(1, shot.transform.position);//小鸟点lineRenderer.SetPosition(2, new Vector3(-5.6f, 1.2f, -0.1f));//弹弓橡皮筋点if (direction != lastDirection){if (!audio.isPlaying){PlaySound(slingShotSound);}   }}else//发射
        {birdNumber++;if (birdNumber<=2){GameObject birdObject2 = GameObject.FindWithTag("birdClone");//实例化的小鸟也就是飞出去的小鸟if (birdObject2!=null){Destroy(birdObject2, 1.0f);////加载物体1秒后销毁游戏物体
                }lineRenderer.enabled = false;//不显示橡皮筋了shot.collider.isTrigger = false;shot.rigidbody.isKinematic = false;// 是否动力学：[ˌkɪnɪ'mætɪk] adj. 运动学的，运动学上的shot.rigidbody.velocity = direction * 7.0f * magnitude;//速度shot.rigidbody.useGravity = true;if (audio.isPlaying){audio.Stop();}PlaySound(flyingSound); shot.tag = "birdClone";isClick = false;}}}/// <summary>/// 小鸟拉伸发生声音/// </summary>/// <param name="soundName"></param>/// <returns></returns>public  void PlaySound(AudioClip soundName){if (!audio.isPlaying){audio.clip = soundName;audio.Play(); new WaitForSeconds(audio.clip.length);}   }
}