using UnityEngine;using System.Collections; public class NPC : MonoBehaviour {     //主摄像机对象    private Camera camera;    //NPC名称    private string name = "我是雨松MOMO";     //主角对象    GameObject hero;    //NPC模型高度    float npcHeight;    //红色血条贴图    public Texture2D blood_red;    //黑色血条贴图    public Texture2D blood_black;    //默认NPC血值    private int HP = 100;     void Start ()    {        //根据Tag得到主角对象        hero = GameObject.FindGameObjectWithTag("Player");        //得到摄像机对象        camera = Camera.main;         //注解1        //得到模型原始高度        float size_y = collider.bounds.size.y;        //得到模型缩放比例        float scal_y = transform.localScale.y;        //它们的乘积就是高度        npcHeight = (size_y *scal_y) ;     }     void Update ()    {        //保持NPC一直面朝主角        transform.LookAt(hero.transform);    }     void OnGUI()    {        //得到NPC头顶在3D世界中的坐标        //默认NPC坐标点在脚底下，所以这里加上npcHeight它模型的高度即可        Vector3 worldPosition = new Vector3 (transform.position.x , transform.position.y + npcHeight,transform.position.z);        //根据NPC头顶的3D坐标换算成它在2D屏幕中的坐标        Vector2 position = camera.WorldToScreenPoint (worldPosition);        //得到真实NPC头顶的2D坐标        position = new Vector2 (position.x, Screen.height - position.y);        //注解2        //计算出血条的宽高        Vector2 bloodSize = GUI.skin.label.CalcSize (new GUIContent(blood_red));         //通过血值计算红色血条显示区域        int blood_width = blood_red.width * HP/100;        //先绘制黑色血条        GUI.DrawTexture(new Rect(position.x - (bloodSize.x/2),position.y - bloodSize.y ,bloodSize.x,bloodSize.y),blood_black);        //在绘制红色血条        GUI.DrawTexture(new Rect(position.x - (bloodSize.x/2),position.y - bloodSize.y ,blood_width,bloodSize.y),blood_red);         //注解3        //计算NPC名称的宽高        Vector2 nameSize = GUI.skin.label.CalcSize (new GUIContent(name));        //设置显示颜色为黄色        GUI.color  = Color.yellow;        //绘制NPC名称        GUI.Label(new Rect(position.x - (nameSize.x/2),position.y - nameSize.y - bloodSize.y ,nameSize.x,nameSize.y), name);     }     //下面是经典鼠标点击对象的事件，大家看一下就应该知道是什么意思啦。    void onm ouseDrag ()    {        Debug.Log("鼠标拖动该模型区域时");    }     void onm ouseDown()    {        Debug.Log("鼠标按下时");         if(HP >0)        {            HP -=5 ;        }     }    void onm ouseUp()    {        Debug.Log("鼠标抬起时");    }     void onm ouseEnter()    {        Debug.Log("鼠标进入该对象区域时");    }    void onm ouseExit()    {        Debug.Log("鼠标离开该模型区域时");    }    void onm ouseOver()    {        Debug.Log("鼠标停留在该对象区域时");    } }