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在完成前面的基础性工作之后，接下来就到了重头戏：游戏主界面和游戏逻辑的搭建。
1.游戏主界面的搭建
今天我们要完成的工作是：点击play进入游戏界面，对应的在游戏界面显示一些东西.
效果：
看到以上四张图相信大家应该很明白要干什么了，下面我们上代码
GameScreen类：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 | package com.zhf.mylibgdx; import com.badlogic.gdx.Game; import com.badlogic.gdx.Gdx; import com.badlogic.gdx.Screen; import com.badlogic.gdx.graphics.GL10; import com.badlogic.gdx.graphics.GLCommon; import com.badlogic.gdx.graphics.OrthographicCamera; import com.badlogic.gdx.graphics.g2d.SpriteBatch; import com.badlogic.gdx.math.Rectangle; import com.badlogic.gdx.math.Vector3; /** * 游戏主界面 * @author ZHF * */ public class GameScreen implements Screen { //状态 static final int GAME_READY = 0 ; //准备 static final int GAME_RUNNING = 1 ; //运行 static final int GAME_PAUSED = 2 ; //暂停 static final int GAME_LEVEL_END = 3 ; //本关结束 static final int GAME_OVER = 4 ; //游戏结束 Game game; int state; //状态 OrthographicCamera guiCam; //相机 Vector3 touchPoint; //触点 SpriteBatch batcher; //用于绘画的 Rectangle pauseBounds; //暂停按钮 Rectangle resumeBounds; //继续游戏按钮 Rectangle quitBounds; //离开按钮 int lastScore; //最后得分 String scoreString; //显示分数 public GameScreen(Game game) { this .game = game; //初始化工作 state = GAME_READY; guiCam = new OrthographicCamera( 320 , 480 ); guiCam.position.set( 320 / 2 , 480 / 2 , 0 ); //将相机的视角设为中间 touchPoint = new Vector3(); batcher = new SpriteBatch(); pauseBounds = new Rectangle( 320 - 64 , 480 - 64 , 64 , 64 ); resumeBounds = new Rectangle( 160 - 96 , 240 , 192 , 36 ); quitBounds = new Rectangle( 160 - 96 , 240 - 36 , 192 , 36 ); lastScore = 0 ; scoreString = "SCORE: 0" ; } /**刷新状态**/ public void update ( float deltaTime) { if (deltaTime > 0 .1f) deltaTime = 0 .1f; //根据游戏动向，刷新状态 switch (state) { case GAME_READY: updateReady(); //准备状态 break ; case GAME_RUNNING: updateRunning(deltaTime); //游戏运行状态 break ; case GAME_PAUSED: updatePaused(); //游戏暂停状态 break ; case GAME_LEVEL_END: //本关结束 updateLevelEnd(); break ; case GAME_OVER: updateGameOver(); //游戏结束 break ; } } /**准备状态**/ private void updateReady () { if (Gdx.input.justTouched()) { state = GAME_RUNNING; } } /**游戏运行状态**/ private void updateRunning ( float deltaTime) { if (Gdx.input.justTouched()) { guiCam.unproject(touchPoint.set(Gdx.input.getX(), Gdx.input.getY(), 0 )); //点击暂停 if (OverlapTester.pointInRectangle(pauseBounds, touchPoint.x, touchPoint.y)) { Assets.playSound(Assets.clickSound); state = GAME_PAUSED; return ; } } } /**游戏暂停状态**/ private void updatePaused () { if (Gdx.input.justTouched()) { guiCam.unproject(touchPoint.set(Gdx.input.getX(), Gdx.input.getY(), 0 )); //点击继续游戏 if (OverlapTester.pointInRectangle(resumeBounds, touchPoint.x, touchPoint.y)) { Assets.playSound(Assets.clickSound); state = GAME_RUNNING; return ; } //点击离开，返回到主菜单界面 if (OverlapTester.pointInRectangle(quitBounds, touchPoint.x, touchPoint.y)) { Assets.playSound(Assets.clickSound); game.setScreen( new MainMenuScreen(game)); return ; } } } /**本关结束**/ private void updateLevelEnd () { if (Gdx.input.justTouched()) { state = GAME_READY; } } /**游戏结束**/ private void updateGameOver () { if (Gdx.input.justTouched()) { game.setScreen( new MainMenuScreen(game)); } } /**绘画**/ public void draw ( float deltaTime) { GLCommon gl = Gdx.gl; gl.glClear(GL10.GL_COLOR_BUFFER_BIT); gl.glClearColor(0f, 0f, 0f, 0f); guiCam.update(); batcher.setProjectionMatrix(guiCam.combined); batcher.enableBlending(); batcher.begin(); //根据游戏状态刷新界面 switch (state) { case GAME_READY: presentReady(); //绘制准备界面 break ; case GAME_RUNNING: presentRunning(); //绘制暂停和分数显示 break ; case GAME_PAUSED: presentPaused(); //绘制暂停菜单和分数显示 break ; case GAME_LEVEL_END: presentLevelEnd(); //绘制本关结束 break ; case GAME_OVER: presentGameOver(); //绘制游戏结束 break ; } batcher.end(); } /**绘制准备**/ private void presentReady () { batcher.draw(Assets.ready, 160 - 192 / 2 , 240 - 32 / 2 , 192 , 32 ); } /**绘制暂停和分数显示**/ private void presentRunning () { batcher.draw(Assets.pause, 320 - 64 , 480 - 64 , 64 , 64 ); Assets.font.draw(batcher, scoreString, 16 , 480 - 20 ); } /**绘制暂停菜单和分数显示**/ private void presentPaused () { batcher.draw(Assets.pauseMenu, 160 - 192 / 2 , 240 - 96 / 2 , 192 , 96 ); Assets.font.draw(batcher, scoreString, 16 , 480 - 20 ); } /**绘制本关结束**/ private void presentLevelEnd () { String topText = "the princess is ..." ; String bottomText = "in another castle!" ; float topWidth = Assets.font.getBounds(topText).width; float bottomWidth = Assets.font.getBounds(bottomText).width; Assets.font.draw(batcher, topText, 160 - topWidth / 2 , 480 - 40 ); Assets.font.draw(batcher, bottomText, 160 - bottomWidth / 2 , 40 ); } /**绘制游戏结束**/ private void presentGameOver () { batcher.draw(Assets.gameOver, 160 - 160 / 2 , 240 - 96 / 2 , 160 , 96 ); float scoreWidth = Assets.font.getBounds(scoreString).width; Assets.font.draw(batcher, scoreString, 160 - scoreWidth / 2 , 480 - 20 ); } @Override public void render( float delta) { update(delta); draw(delta); } @Override public void resize( int width, int height) { // TODO Auto-generated method stub } @Override public void show() { // TODO Auto-generated method stub } @Override public void hide() { // TODO Auto-generated method stub } @Override public void pause() { if (state == GAME_RUNNING) state = GAME_PAUSED; } @Override public void resume() { // TODO Auto-generated method stub } @Override public void dispose() { // TODO Auto-generated method stub } } |
分析：
这里代码里的注释已经写得很清楚，这里我再讲一下框架，方便初学者学习，在构造方法里我们初始化了一些变量，接下来很重要的一步就是在render()方法里写了两个重要的方法：update() 和 draw(); 即：游戏的逻辑
update(float deltaTime): 根据游戏动向不断地刷新状态（准备状态、游戏运行状态、游戏暂停状态、本关结束、本关结束）
draw(float deltaTime): 根据游戏状态刷新界面（
presentReady(); //绘制准备界面
presentRunning(); //绘制暂停和分数显示
presentPaused(); //绘制暂停菜单和分数显示
presentLevelEnd(); //绘制本关结束
presentGameOver(); //绘制游戏结束
我们别忘了和前面一样，在MainMneuScreen中将条状那行注释去掉：
| 1 | game.setScreen( new GameScreen(game)); |
同样，游戏界面中包含一些元素（如暂停按钮，菜单等），自然要在Asset类中对应的加载资源进去。
声明：
| 1 2 3 4 5 | //游戏界面 public static TextureRegion pause; //暂停按钮 public static TextureRegion pauseMenu; //暂停弹出菜单 public static TextureRegion ready; //准备 public static TextureRegion gameOver; //游戏结束 |
实例化：
| 1 2 3 4 5 | //游戏界面界面 pause = new TextureRegion(items, 64 , 64 , 64 , 64 ); pauseMenu = new TextureRegion(items, 224 , 128 , 192 , 96 ); ready = new TextureRegion(items, 320 , 224 , 192 , 32 ); gameOver = new TextureRegion(items, 352 , 256 , 160 , 96 ); |
ok！这一讲可能代码比较少，这里我们主要先将框架搭建起来，下一讲我们我涉及到游戏场景中各个元素以及世界的编写。
源码下载：
本文转自zhf651555765 51CTO博客，原文链接：http://blog.51cto.com/smallwoniu/1262906，如需转载请自行联系原作者