楊航最近在學Unity3D
using UnityEngine;
using System.Collections;

public class NPC : MonoBehaviour {

??????? //主攝像機對象
??????? public? Camera camera;
??????? //NPC名稱
??????? private string name = "我是doudou";

??????? //主角對象
??????? public GameObject hero;
??????? //NPC模型高度
??????? float npcHeight;
??????? //紅色血條貼圖
??????? public Texture2D blood_red;
??????? //黑色血條貼圖
??????? public Texture2D blood_black;
??? //默認NPC血值
??????? private int HP = 100;

??????? void Start ()
??????? {
??????????????? 根據Tag得到主角對象
??????????????? //hero = GameObject.FindGameObjectWithTag("Human");
??????????????? 得到攝像機對象
??????????????? //camera = Camera.main;
??????????? blood_red = new Texture2D(100, 10,TextureFormat.RGBA32,false);

??????????? blood_red.SetPixel(100,10, Color.red);
??????????? blood_black = new Texture2D(100, 10, TextureFormat.RGBA32, false);
??????????? blood_black.SetPixel(100,10, Color.black);

?
??????????????? //注解1
??????????????? //得到模型原始高度
??????????????? float size_y = collider.bounds.size.y;
??????????????? //得到模型縮放比例
??????????????? float scal_y = transform.localScale.y;
??????????????? //它們的乘積就是高度
??????????????? 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頭頂在3D世界中的坐標
??????????????? //默認NPC坐標點在腳底下，所以這里加上npcHeight它模型的高度即可
??????????????? Vector3 worldPosition = new Vector3 (transform.position.x , transform.position.y + npcHeight,transform.position.z);
??????????????? //根據NPC頭頂的3D坐標換算成它在2D屏幕中的坐標
??????????????? Vector2 position = camera.WorldToScreenPoint (worldPosition);
??????????????? //得到真實NPC頭頂的2D坐標
??????????????? position = new Vector2 (position.x, Screen.height - position.y);
??????????????? //注解2
??????????????? //計算出血條的寬高
??????????????? Vector2 bloodSize = GUI.skin.label.CalcSize(new GUIContent(blood_red));

??????????????? //通過血值計算紅色血條顯示區域
??????????????? int blood_width = blood_red.width * HP / 100;
??????????????? //先繪制黑色血條
??????????????? GUI.DrawTexture(new Rect(position.x - (bloodSize.x / 2), position.y - bloodSize.y, bloodSize.x, bloodSize.y), blood_black);
??????????????? //在繪制紅色血條
??????????????? GUI.DrawTexture(new Rect(position.x - (bloodSize.x / 2), position.y - bloodSize.y, blood_width, bloodSize.y), blood_red);

??????????????? //注解3
??????????????? //計算NPC名稱的寬高
??????????????? Vector2 nameSize = GUI.skin.label.CalcSize(new GUIContent(name));
??????????????? //設置顯示顏色為黃色
??????????????? GUI.color = Color.yellow;
??????????????? //繪制NPC名稱
??????????????? GUI.Label(new Rect(position.x - (nameSize.x / 2), position.y - nameSize.y - bloodSize.y, nameSize.x, nameSize.y), name);

??????? }

??????? //下面是經典鼠標點擊對象的事件，大家看一下就應該知道是什么意思啦。
??????? void OnMouseDrag ()
??????? {
??????????????? Debug.Log("鼠標拖動該模型區域時");
??????? }

??????? void OnMouseDown()
??????? {
??????????????? Debug.Log("鼠標按下時");

??????????????? if(HP >0)
??????????????? {
??????????????????????? HP -=5 ;
??????????????? }

??????? }
??????? void OnMouseUp()
??????? {
??????????????? Debug.Log("鼠標抬起時");
??????? }

??????? void OnMouseEnter()
??????? {
??????????????? Debug.Log("鼠標進入該對象區域時");
??????? }
??????? void OnMouseExit()
??????? {
??????????????? Debug.Log("鼠標離開該模型區域時");
??????? }
??????? void OnMouseOver()
??????? {
??????????????? Debug.Log("鼠標停留在該對象區域時");
??????? }

}