十三UI和关卡
使用Unity3D的UI功能来创建UI。13.1创建UI
13.1.1Canvas
首先创建Canvas来方式UI所需组件，方法：点击窗口GameObject/UI/Canvas如图：
13.1.2Image
创建一个Image组件GameObject/UI/Image。系统会自动创建Image并设置为canvas的子对象。切换Scenc窗口。鼠标中键拉远镜头。直到image出现在窗口中。如图：
设置Ancher切换Inspector窗口。点击
按住键盘Alt键同时悬着Anchor Presets窗口右下角的Stretch。
设置Image (Script)/Color为黑色
修改Image的名称为LevelImage即可。
13.1.3Text
创建Text来显示关卡数，首先选定LevelImage，创建GameObject/UI/Text。系统自动一个Text并设置为Canvas子组件。修改名称为LevelText。
修改Anchor为屏幕中心。方法参考Image。如图：
设置Text(Script)/Color = White
设置Text(Script)/Charactor / Font Size = 12 如图：
发现窗口中的文字显示不正常，这是由于字体过大，显示区域过小造成的。
设置Text(Script)/Paragraph/Horzontial Overflow = overflow
设置Text(Script)/Paragraph/Vertial Overflow = overflow
设置Text(Script)/ Charactor /Alignment = center,Middle
设置Text(Script)/ Charactor /Font = PressStart2P-Regular 位于Project/Asserts/Font下面。
设置Text(Script)/Text = “Day 1”
设置LevelText为LevelImage的子组件。方便控制。
同样方法创建Food参数如下：
Anchor = bottom-center
Text = “Food: 100”
Font = PressStart2P-Regular
Font Size = 24
Alignment = center,Middle
Horzontial Overflow = overflow
Vertial Overflow = overflow
Color = white
由于FoodText在游戏运行时候的显示，所以需要把FoodText设置在LevelImage更深的一层。方式：设置FoodText移动到Canvas下面并且LevelImage上面。此时在窗口中看不到FoodText。切换到Inspector窗口，把LevelImage对象的设置成不可见。(取消选中即可)如图：
就可以看见FoodText了。如图：
移动FoodText向上一些。设置
Pos Y = 0
Anchors/ Min Y = 0.05
Anchors/ Max Y = 0.05
13.2修改脚本
修改GameManager。cs如下
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;
public class GameManager : MonoBehaviour
{
//从新开始关卡的延迟
public float startLevelDelay = 2f;
//延迟
public float turnDelay = 0.1f;
//敌人
private List<Enemy> enemies;
//敌人是否移动
private bool enemiesMoving;
public static GameManager instance = null;
//关卡管理器脚本
public BoardManager boardScript;
//初始关卡数
private int level = 1;
public int playerFoodPoints = 100;
[HideInInspector]
public bool playersTurn = true;
private Text levelText ;
private GameObject levelImage;
private bool doingSetup;
void Awake ()
{
if (instance == null)
instance = this;
else
Destroy(instance);
DontDestroyOnLoad(gameObject);
//初始化敌人信息
enemies = new List<Enemy>();
//初始化关卡脚本
boardScript = GetComponent<BoardManager>();
//初始化游戏
InitGame();
}
//Unity内置API在每个场景加载后调用
private void OnLevelWasLoaded(int index)
{
level ++;
InitGame();
}
public void GameOver()
{
levelText.text =" After "+level +" daies, you starved.";
levelImage.SetActive(true);
enabled =false;
}
//初始化游戏
void InitGame()
{
doingSetup = true;
levelImage = GameObject.Find("LevelImage");
levelText = GameObject.Find("LevelText").GetComponent<Text>();
levelText.text = "Day " + level;
levelImage.SetActive(true);
Invoke("HideLevelImage",startLevelDelay);
//清空上一关敌人信息
enemies.Clear();
boardScript.SetupScene(level);
}
IEnumerator MoveEnemies()
{
enemiesMoving = true;
yield return new WaitForSeconds(turnDelay);
if(enemies.Count == 0)
{
yield return new WaitForSeconds(turnDelay);
}
for(int i=0;i<enemies.Count;i++)
{
enemies[i].EnemyMove();
yield return new WaitForSeconds(enemies[i].moveTime);
}
playersTurn = true;
enemiesMoving = false;
}
void Update ()
{
if(playersTurn || enemiesMoving ||doingSetup)
return;
StartCoroutine(MoveEnemies());
}
public void AddEnemyToList(Enemy script)
{
enemies.Add(script);
}
}修改Player。cs代码如下：
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class Player : MovingObject
{
//对内墙的破坏力
public int wallDamage = 1;
//食物增加生命
public int pointsPerFood = 10;
//苏打增加生命
public int pointsPerSoda = 20;
//重启延迟时间
public float restartLevelDelay = 1f;
//Player动画
private Animator animator;
//当前生命值
private int food ;
public Text foodText;
protected override void Start ()
{
animator = GetComponent<Animator>();
food = GameManager.instance.playerFoodPoints;
foodText.text = "Food: "+food;
base.Start();
}
void Update ()
{
if(!GameManager.instance.playersTurn)
return ;
//键盘输入，控制角色移动。
int horizontal = 0;
int vertical = 0 ;
horizontal = (int)Input.GetAxisRaw("Horizontal");
vertical = (int)Input.GetAxisRaw("Vertical");
if(horizontal!=0)
vertical = 0;
if(horizontal!=0 || vertical!=0)
AttemptMove<Wall>(horizontal,vertical);
}
//内置函数
private void OnDisable()
{
GameManager.instance.playerFoodPoints = food;
}
protected override void AttemptMove<T>(int xDir,int yDir)
{
//没移动一次食物减少1
food--;
foodText.text = "Food: "+food;
base.AttemptMove<T>(xDir,yDir);
GameManager.instance.playersTurn =false;
}
//检查是否游戏结束
private void CheckIfGameOver()
{
//当前生命低于0游戏结束
if(food <= 0 )
{
GameManager.instance.GameOver();
}
}
//碰撞内墙
protected override void OnCantMove<T>(T component)
{
Wall hitWall = component as Wall;
//破坏内墙
hitWall.DamageWall(wallDamage);
//出发PlayerChop触发器
animator.SetTrigger("PlayerChop");
}
//主角移动套exit的时候，加载下一关
private void Restart()
{
Application.LoadLevel(Application.loadedLevel);
}
//主角被敌人攻击的时候损失生命值
public void LoseFood(int loss)
{
//出发PlayerHit触发器
animator.SetTrigger("PlayerHit");
food -= loss;
foodText.text = "-" + loss + "Food: "+food;
CheckIfGameOver();
}
//检查碰撞，exit，food，soda
private void OnTriggerEnter2D(Collider2D other)
{
//主角移动到出口
if(other.tag == "Exit")
{
Invoke("Restart",restartLevelDelay);
enabled = false;
}
//吃掉食物
else if(other.tag == "Food")
{
food += pointsPerFood;
foodText.text = "+" + pointsPerFood + " Food: "+food;
other.gameObject.SetActive(false);
}
//喝掉苏打汽水
else if(other.tag == "Soda")
{
food += pointsPerSoda;
foodText.text = "+" + pointsPerSoda + "Food: "+food;
other.gameObject.SetActive(false);
}
}
}修改Player预制体的Player脚本的FoodText属性为Canvas/FoodText
