LibGdx练习-像素鸟（二）

游戏资源管理

大美督创建接口Res对于资源路径和变量进行统一管理方式项目零散，便于调试。

public interface Res {/** 固定世界宽度为 480, 高度根据实际屏幕比例换算 */public static final float FIX_WORLD_WIDTH = 600;public static final float FIX_WORLD_HEIGHT = 900;/** 帧率显示所需要的位图字体 文件路径 */public static final String FPS_BITMAP_FONT_PATH = "fps/fps24px.fnt";/*** 相关物理参数（调节物理参数可改变游戏难度）*/public static interface Physics {/** 水管和地板的移动速度, 单位: px/s */public static final float MOVE_VELOCITY = -150.0F;/** 点击屏幕时给小鸟的竖直方向上的速度, 单位: px/s */public static final float JUMP_VELOCITY = 150.0F;/** 小鸟竖直方向上的重力加速度, 单位: px/(s*s) */public static final float GRAVITY = -200.0F;/** 撞入深度, 小鸟撞入水管或地板该深度后才算碰撞 */public static final float DEPTH = 0.0F;/** 生成水管时间间隔, 单位: s */public static final float GENERATE_BAR_TIME_INTERVAL = 2.2F;/** 上下水管之间的间隔 */public static final float BAR_INTERVAL = 180.0F;}/*** 纹理图集*/public static interface Atlas {/** 纹理图集 文件路径 */public static final String ATLAS_PATH = "atlas/images.atlas";/* 纹理图集中的小图名称 */public static final String IMAGE_GAME_BG = "game_bg";public static final String IMAGE_GAME_FLOOR = "game_floor";public static final String IMAGE_GAME_RESULT_BG = "game_result_bg";public static final String IMAGE_BAR_DOWN = "bar_down";public static final String IMAGE_BAR_UP = "bar_up";public static final String IMAGE_GAME_TAP_TIP = "game_tap_tip";public static final String IMAGE_GAME_READY = "game_ready";public static final String IMAGE_GAME_OVER = "game_over";public static final String IMAGE_GAME_START_01_TO_02 = "game_start";public static final String IMAGE_GAME_MEDAL_01_TO_04 = "game_medal";public static final String IMAGE_NUM_BIG_00_TO_09 = "num_big";public static final String IMAGE_NUM_SCORE_00_TO_09 = "num_score";public static final String IMAGE_BIRD_YELLOW_01_TO_03 = "bird_yellow";}/*** 音效*/public static interface Audios {/** 音效资源文件夹路径 */public static final String AUDIO_BASE_DIR	= "audio/";// 音效资源路径public static final String AUDIO_DIE = AUDIO_BASE_DIR + "die.ogg";public static final String AUDIO_HIT = AUDIO_BASE_DIR + "hit.ogg";public static final String AUDIO_TOUCH = AUDIO_BASE_DIR + "touch.ogg";public static final String AUDIO_RESTART = AUDIO_BASE_DIR + "restart.ogg";public static final String AUDIO_SCORE = AUDIO_BASE_DIR + "score.ogg";}
}

资源中主要包括

• 资源常量
• 图集和文字集
• 音频

三个部分来进行统一管理。

与此同时，在util包下对于游戏进行状态进行了枚举类型的封装。

public enum GameState {/** 准备状态 */ready,/** 游戏状态(小鸟处于飞翔状态) */fly,/** 小鸟死亡状态(撞到水管, 掉落到地板前) */die,/** 游戏结束(撞到地板或撞到水管后掉落到地板) */gameOver,//    暂停状态pause,
//    恢复状态resume;
}

工具包

工具包下Assets主要完成了对于资源管理器的封装，配合Res接口完成资源的调用。

public class AssetsUtil {private static AssetManager assetManager;public static TextureAtlas atlas;public static BitmapFont bitmapFont;public static void init(){assetManager = new AssetManager();}public static void load(){//		加载资源assetManager.load(Res.Atlas.ATLAS_PATH, TextureAtlas.class);assetManager.load(Res.Audios.AUDIO_DIE, Sound.class);assetManager.load(Res.Audios.AUDIO_HIT, Sound.class);assetManager.load(Res.Audios.AUDIO_TOUCH, Sound.class);assetManager.load(Res.Audios.AUDIO_RESTART, Sound.class);assetManager.load(Res.Audios.AUDIO_SCORE, Sound.class);assetManager.load(Res.FPS_BITMAP_FONT_PATH, BitmapFont.class);}public static boolean loadFinished(){
//        加载图集和文字集atlas = assetManager.get(Res.Atlas.ATLAS_PATH);bitmapFont = assetManager.get(Res.FPS_BITMAP_FONT_PATH);return true;}/*** 等待资源加载完毕* @return*/public static boolean update(){return assetManager.update();}public static AssetManager getAssetManager() {return assetManager;}//    资源管理器需要手动释放public static void dispose(){assetManager.dispose();assetManager = null;atlas = null;bitmapFont = null;}
}

CollisionUtils类主要负责碰撞检测操作，调用其中的isCollision方法可以直接判断两个actor的碰撞情况，发生碰撞返回true，否则返回false。

public class CollisionUtils {private static final Rectangle rect1 = new Rectangle();private static final Rectangle rect2 = new Rectangle();private static final Rectangle tempRect = new Rectangle();/*** 判断两个演员是否碰撞* * @param actor1* @param actor2* @param depth 碰撞深度, 两个演员的包围矩阵重叠部分的矩形宽高均超过 depth 才算碰撞* @return*/public static synchronized boolean isCollision(Actor actor1, Actor actor2, float depth) {if (actor1 == null || actor2 == null) {return false;}// 获取 演员1 缩放后的包围矩阵rect1.setSize(actor1.getWidth() * actor1.getScaleX(),actor1.getHeight() * actor1.getScaleY());rect1.setPosition(actor1.getX() - (actor1.getOriginX() * actor1.getScaleX() - actor1.getOriginX()),actor1.getY() - (actor1.getOriginY() * actor1.getScaleY() - actor1.getOriginY()));// 获取 演员2 缩放后的包围矩阵rect2.setSize(actor2.getWidth() * actor2.getScaleX(),actor2.getHeight() * actor2.getScaleY());rect2.setPosition(actor2.getX() - (actor2.getOriginX() * actor2.getScaleX() - actor2.getOriginX()),actor2.getY() - (actor2.getOriginY() * actor2.getScaleY() - actor2.getOriginY()));return rect1.overlaps(rect2);}
}

SoundPlayer类负责银盆播放。

public class SoundPlayer {private boolean sound = true;public SoundPlayer(boolean sound){this.sound = sound;}public void playSound(String soundName){if(!AssetsUtil.getAssetManager().isLoaded(soundName)) return;if (!sound){Gdx.app.error("myk","未获取音频权限");return;}Sound sound = AssetsUtil.getAssetManager().get(soundName);sound.play();}
}

本处当没有获得音频播放权限的时候给出日志提示，实际操作时可以考虑弹出异常，对于异常进行捕获处理，弹窗提示等。